Welcome to a new era of petroleum testing

Service Manual
for

ERASPEC
FULLY AUTOMATED
FTIR FUEL ANALYZER

Gasoline and Diesel analysis in seconds

Firmware Version: ≥ 137

eralytics GmbH, Lohnergasse 3, 1210 Vienna, Austria______Handelsgericht Wien, FB No.: 293139 m; UID/VAT: ATU63391207
Tel: +43 1 890 50 330 / Fax: +43 1 890 50 3315 / E-mail: office@eralytics.com / Skype: eralytics.hotline / Internet: www.eralytics.com
 Welcome to a new era of petroleum testing

Table of Contents
1. ERASPEC support at eralytics...............................................................................................4
2. User Level 6...........................................................................................................................5
2.1 Accessible menus and functions ......................................................................................5
2.2 Service password .............................................................................................................5
3. Actions when Errors or Warnings occurs ..............................................................................6
3.1 Error 1: Memory Allocation Error...................................................................................6
3.2 Error 2: No Peak Found in Interferogram........................................................................6
3.2.1 Maximum is found at a data point > 900 ..................................................................7
3.2.2 Maximum is found at a data point < 130 ..................................................................7
3.2.3 No big maximum is found ........................................................................................8
3.3 Error 3: Read IFG: Wrong Interferogram Type...............................................................8
3.4 Error 4: Read IFG: File Open Error.................................................................................8
3.5 Error 5: Read IFG: File Read Error .................................................................................8
3.6 Error 6: Measurement Stopped by User...........................................................................8
3.7 Error 7: Timeout Error Position of Absorption Cell........................................................8
3.8 Error 8: Measurement Timeout Error ............................................................................10
3.9 Error 9: Scan Timeout Error ..........................................................................................10
3.10 Error 10: Scan: Wrong # of Data Points ......................................................................10
3.10.1 Adjusting the laser parameters Tset, Cur..............................................................11
3.10.2 Checking the drive ................................................................................................11
3.10.3 Checking the drive parameters..............................................................................12
3.11 Error 14: Data Base: File Open Error ..........................................................................12
3.12 Error 15: Data Base: Singular Matrix ..........................................................................13
3.13 Error 16: No Data in Data Base ...................................................................................13
3.14 Error 17: No Reference................................................................................................13
3.15 Error 18: Reference File Open Error ...........................................................................13
3.16 Error 19: Error at Execution of Background Processes ...............................................13
3.17 Error 20: Mirror Drive Error........................................................................................13
3.18 Error 21: No Reference................................................................................................14
3.19 Error 23: Checksum Error............................................................................................14
3.20 Error and warning messages ........................................................................................14
3.20.1 Check Inlet Filter ..................................................................................................14
3.20.2 Cell position ..........................................................................................................14
3.20.3 Checksum Error ....................................................................................................14
3.20.4 Data Size Error......................................................................................................14
4. Other possible malfunctions ................................................................................................15
4.1 Instrument does not start................................................................................................15
4.2 Intensity of reference is low...........................................................................................15
5. Instructions for FileZilla ......................................................................................................18
5.1 LAN connection.............................................................................................................18
5.2 Direct connection to a computer ....................................................................................19
5.3 File structure ..................................................................................................................20
5.4 Data transfer from ERASPEC to the PC........................................................................24
5.5 Data transfer from a PC to the ERASPEC.....................................................................25
5.6 Disconnect from FileZilla ..............................................................................................25
6. Disassembling and Assembling Instructions .......................................................................26

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 6.1 Removing and installing the housing.............................................................................26
6.2 Removing the Luer inlet ................................................................................................26
6.3 Installing the Luer inlet..................................................................................................26
6.4 Removing the outlet.......................................................................................................26
6.5 Installing the outlet ........................................................................................................27
6.6 Exchanging the laser assembly ......................................................................................27
7. Special tools, supplies, and spare parts................................................................................31
8. Configuration of the result.txt file .......................................................................................32
8.1 Modifying the result.txt file using FileZilla...................................................................32
8.2 Modifying the result.txt file using a memory stick (SW ≥ 128)....................................33
9. Screenshots ..........................................................................................................................40
10. Storing temporary files on a memory stick........................................................................42

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1. ERASPEC support at eralytics
Please contact the following individuals when you need additional advice for cases
not described in this manual:

Roland Aschauer: Roland is responsible for the ERASPEC. Therefore, he should be

the first person to contact.
e-mail: aschauer@eralytics.com
Skype name: roland.aschauer

Ernst Hamann: If Roland is not available, or in case of a specifically electronic or

software related problem, please contact Ernst.
e-mail: hamann@eralytics.com
Skype name: ehamann

Andreas Schwarzmann: If neither of the above is available, please contact Andreas.

e-mail: schwarzmann@eralytics.com
Skype name: andreas.schwarzmann

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2. User Level 6

ATTENTION:
The ERASPEC User Level should be set to 5 or lower for the routine
operation of the ERASPEC by the customer.

Whenever it is necessary to set the user level to 6, set the User

Lever to 5 or lower before the ERASPEC is returned to the
customer.

2.1 Accessible menus and functions

The menu Maint and the menus Network, App and Test in the System menu are
accessible only when the User level is set to 6. In the Measure menu, certain
functions are only displayed at user level 6.

Please refer to the ERASPEC Operation Manual for a detailed description of how to
change the user level, the Maint and System - Network, App and Test menus, and
the additional functions in the measure menu.

2.2 Service password

The password is “123456” when the ERASPEC is delivered by eralytics. However,
this password may be changed by the customer.

In order to always have the possibility to set the User Level to 6, there is a service
password which cannot be changed.

This service password is “result”.

Using this password, the User Level can always be changed, no matter if the original
customer password has been changed or not.

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3. Actions when Errors or Warnings occurs
Whenever a measurement cannot be finished correctly, the ERASPEC displays
“Error” together with a number, or sometimes a description of the error:

The number indicates the type of error that has occurred.

The following paragraphs describe what to do after such an error.

3.1 Error 1: Memory Allocation Error

If this error occurs, please switch the instrument off, wait until the LED and the
display become dark, and then switch it on again. When the instrument is ready,
retry the measurement.
If this error occurs when you try to save data (results or libraries) to a memory stick,
it could be that the memory stick is locked so that writing to the memory stick is not
possible. Please check your memory stick and unlock it.
However, if you get the same error again, please contact eralytics.

3.2 Error 2: No Peak Found in Interferogram

If this error occurs, please switch the instrument off, wait until the LED and the
display become dark, and then switch it on again. When the instrument is ready,
retry the measurement.
If you get the same error, please switch the instrument off.
Check the position of the main peak in the interferogram in the following way:
Go to the Maint menu and switch on the IR source and the laser. Observe the

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intensity of the IR detector. When it reaches a value higher than -2000, press Scan
and wait until 4708 data points have been collected. Then switch off the IR source,
Wait 15 seconds so that the mirror drive can return to the home position, then switch
off the laser also. Transfer the file in.ifg to a PC, using FileZilla as described in the
Sec. “Instructions for FileZilla”. Use a graphics program to display the data in the file
in.ifg. There should be a large minimum and maximum a few data points apart, and
this maximum should be located between data point # 200 and 900.
If not, then the goal is to bring the maximum between data point 300 and data point
800.

3.2.1 Maximum is found at a data point > 900

If this maximum is at data point > 900, then washers of 0.1mm thickness have to be
added to the interferometer arm.
One 0.1mm washer moves the maximum by approximately -350 data points. For
example, if the maximum is found at data point 1345, then 2 washers should be
added to move maximum to approximately data point # 650.
Switch off the instrument. To add washers, open the ERASPEC and remove the lid
of the spectrometer. Unhinge the two springs that are attached to the interferometer
arm (the L-shaped arm that rotates for a scan and holds the two retroreflectors).
Then take this arm out (slide it upwards along the 8mm axis).

ATTENTION: Between the bottom of the brass part that hold both arms and the
interferometer are two 0.3mm washers. They sometimes stick to the bottom of this
brass part because they are lubricated. If they do, please remove them and put them
on the axis again to make sure they cannot be lost.

At the tip of the longer arm, there is a cylindrical part with a glass plate glued to it.

ATTENTION: PLEASE REMEMBER THE ORIENTATION OF THIS GLASS PLATE!

IT IS IMPORTANT TO MOUNT IT IN THIS VERY SAME ORIENTATION AFTER
ADDING THE WASHERS!

Between the cylinder and the arm itself may be some washers already. The
additional washers have to be placed there.
Unscrew the cylinder, but leave the screw and any 0.1mm washers that are already
there in the arm. Then put the desired number of 0.1mm washers on the screw and
mount the cylinder again. Tighten the screw and rotate the cylinder until the glass
plate is in the original position.
Insert the interferometer arm again into the interferometer and restore the two
springs.
Then switch the ERASPEC on again, perform a scan in the Maint menu in the same
way as described above, and get the data on the PC. Check the position of the big
maximum. The maximum should now be in the range 300 to 800 data points.
If not, either a washer has to be added, as described in this Section, or removed, as
described in the Section below.

3.2.2 Maximum is found at a data point < 130

If this maximum is at data point < 130, then one washer of 0.1mm thickness has to
be removed from the interferometer arm.
Follow the instructions of the Section above, with the difference that instead of

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adding washers, one washer has to be removed.
After that, check if the maximum is in the range 300 to 800 data points. If not,
proceed depending on the position of the maximum to remove or add one washer.

3.2.3 No big maximum is found

If there is no distinct, high maximum over the entire 4708 data points, then two
washers of 0.1mm thickness have to be removed from the interferometer arm.
Follow the instructions of the Section above, with the difference that instead of
removing one washer, two washers have to be removed.
After that, check if the maximum is in the range 300 to 800 data points. If not,
proceed depending on the position of the maximum to remove or add one washer.

3.3 Error 3: Read IFG: Wrong Interferogram Type

This error can occur only when trying to load and recalculate a previously measured
data set, as described in the sections “Recalculating reference spectra” and
“Recalculating gasoline measurements” of the ERASPEC operation manual.
The data set you selected is somehow corrupted. Please use a different data set.

3.4 Error 4: Read IFG: File Open Error

This error can occur only when trying to load and recalculate a previously measured
data set, as described in the sections “Recalculating reference spectra” and
“Recalculating gasoline measurements” of the ERASPEC operation manual.
The data set you selected is somehow corrupted. Please use a different data set.

3.5 Error 5: Read IFG: File Read Error

This error can occur only when trying to load and recalculate a previously measured
data set, as described in the sections “Recalculating reference spectra” and
“Recalculating gasoline measurements” of the ERASPEC operation manual.
The data set you selected is somehow corrupted. Please use a different data set.

3.6 Error 6: Measurement Stopped by User

This message is shown when a measurement was terminated by pressing the STOP
button.

3.7 Error 7: Timeout Error Position of Absorption Cell

If the time for the absorption cell to reach the correct position is unexpectedly long,
then this error is displayed.
If this error occurs, please switch the instrument off, wait until the LED and the
display become dark, and then switch it on again. When the instrument is ready,
retry the measurement.
If you get the same error again, please go to the Maint menu and select the
submenu Cell, press the button “0”. Then the cell should return to the zero position,
and the checkbox at Sensor should be marked, indicating that the cell is in the zero
position so that the Hall sensor detects the magnet.

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If that is the case, press the button “20” in the line Cell. Then the mark in the
checkbox at Sensor should disappear.
If that is the case, the cell is moving, and it should be working normally.

If the checkbox at Sensor is never or always marked after you pressed the “0”
button, then the cell does not move.
In this case, please open the ERASPEC and remove the lid of the spectrometer.
Watch the cell and press the button “0” in the menu Maint-cell. If the cell does not
move, and it is positioned very close to the holders of the rail, then press the “0”
button and turn the spindle of the cell clockwise or anticlockwise while the motor is
active (with your fingers is normally enough, no large force is needed) until the cell
starts moving and there is a gap between the holder and the cell. Then press “0”
again. If the cell moves now correctly, it is OK. Close the lid and the instrument.

If the cell still does not move although there is a clear gap between the cell and the
holder, then the cell is stuck for another reason.
The reasons may be:
1) There are two plastic blocks screwed to the interferometer bottom on the left
and right side of the cell. They may be too close together so that the cell is
squeezed between them and hence cannot move.
2) The nut that is driven by the spindle may be too tight in the holder on the cell
so that it cannot move.
3) The spindle may be stuck in the plastic bearing in the holder opposite of the
motor holder.
4) The steel rail may be slightly bent so that the cell cannot slide easily along
that rail.
5) The thread of the spindle and/or the nut may be damaged.

Ad 1): Please open the screw that holds the plastic block between cell and beam
splitter. Press the “0” button. Of the cell moves now, then press the “Ref” button in
the line “Cell” of the Maint menu. When the cell has reached this position, push the
cell towards the beam splitter and tighten the screw on the plastic block.
Check if the cell moves properly by pressing the “Ref” button again. The cell shall
return to the 0 position and then back to the ref position. If not, open the screw of the
holder again and repeat.

Ad 2): Use a screwdriver or any other pointed tool and touch the nut. It should easily
be possible to rotate it a little forth and back on the spindle. If so, this cannot be the
problem.
If you find you cannot rotate it, it is stuck in the holder, then remove the cell from the
instrument. Try to bend the holder so that the space in between where the nut sits
becomes a little wider.
Reinstall the cell and try if it moves correctly now.

Ad 3): Try to move the spindle in the plastic bearing forth and back, up/down and
left/right. The hole in the bearing is slightly bigger than the spindle diameter, so the
spindle should easily slightly move in all directions.
If you find that the rails dose not slide easily in the cell, then remove the cell from the
instrument. Unscrew the holder with the bearing.
ATTENTION: There is a temperature sensor in this holder, therefore it is not possible

9
to take it out!
Bend the holder backwards and use drill of 2.1 mm diameter to enlarge the hole in
the plastic bearing. The plastic is soft, so it is sufficient to move the drill with the
fingers, it is not necessary to use a machine.
Then reinstall the cell and try if it moves correctly now.

Ad 4): Remove the cell from the instrument. If you find that the rails dose not slide
easily in the cell, then drill through the hole in the cell that holds the steel rail with a
4.1mm diameter drill.
Reinstall the cell and try if it moves correctly now.

Ad 5): In this case contact eralytics for spare parts.

3.8 Error 8: Measurement Timeout Error

This error is displayed when the time for the IR source or the detector to reach stable
values before the measurement of the spectrum is initiated is unexpectedly long.
If this error occurs, please retry the measurement.
If you get the same error, please switch the instrument off, wait until the LED and the
display become dark, and then switch it on again. When the instrument is ready,
retry the measurement.
If you get the same error again, please go to the Maint menu and check the
parameter Iset in the Maint-IR menu (it is usually between 600 and 990). Check also
if Kp, Ki in this menu are 40 and 150. If not, set them to these values.
Then switch on the IR source and watch the values in GE and IR in the line IR
source. GE must reach the value Iset after a short time (less than 20 seconds), and
the box near on should become marked.
At that time, the value in IR will be negative and increasing. It should reach a value
higher than -1000 again after a short time, maybe another 20 seconds at most.
If that is the case, everything is OK.
If GE does not reach the Iset value, then probably the IR source needs to be
replaced. Please order a new one.
If anything else happens, please contact eralytics.

3.9 Error 9: Scan Timeout Error

The data packages during a measurement of the spectrum have to reach the CPU
within certain time intervals. If a data package is lost, then this time is too long,
resulting in this error message.
If this error occurs, please retry the measurement.
If you get the same error, please switch the instrument off, wait until the LED and the
display become dark, and then switch it on again. When the instrument is ready,
retry the measurement. In virtually all cases, it will work now.
If you get the same error again, please contact eralytics.

3.10 Error 10: Scan: Wrong # of Data Points

If data packages are lost during a measurement, the number of data points is
smaller than expected, indicating this loss. Then this error is displayed.

10
If this error occurs, please retry the measurement.
If you get the same error, please switch the instrument off, wait until the LED and the
display become dark, and then switch it on again. When the instrument is ready,
retry the measurement.
If you still get the same error, please go to the Maint menu and switch on the laser.
After 3 seconds, press “Scan”. During the scan, observe the field “Amp” in drive, and
after the scan, check Amin and Amax in the menu Maint-Laser.
If Amp and Amin become smaller than 10, then the laser parameters need to be
readjusted, as described in the next section.
If Amp is always greater than 10 during the scan, and possibly Amin is also bigger
that 10, then the laser is OK. Please proceed as described in the next but one
section “Checking the drive”.

3.10.1 Adjusting the laser parameters Tset, Cur

Go to the Maint-Laser menu. Increase the value for Tset by 1. Wait until T2 has
reached this new Tset value, then switch on the laser and make a Scan.
If Amin is bigger than 10 after the scan, and 4708 data were reached, then increase
Tset again by one and repeat. If Amin is bigger than before, keep increasing Tset by
1.
If, after the first scan, Amin is still smaller than 10, then decrease Tset by 2 (1 less
than the original value). Perform a scan and see if Amin is bigger now. If it is, keep
decreasing Tset.
In this way, find the Tset for which Amin is a maximum. Set Tset to this value and
store it (press both save buttons in the Maint-Misc menu).
Perform one Scan with this Tset.
Then increase the value if the parameter Cur by 5 and repeat the Scan. If Amin
increases, keep increasing Cur.
ATTENTION: Amax has to be below 170. If Amax is bigger than 170, Cur should not
be increased.
If Amin does not increase, decrease Cur by 5 and repeat the Scan.
In this way, find the Cur value for which Amin is biggest and Amax is still less than
170.
Switch off the laser and store this value!
Then perform a normal reference measurement to verify that it works now.

3.10.2 Checking the drive

Please open the instrument and remove the lid from the spectrometer.
Check if the lever by which the piezo motor drives the mirror is in the home position,
i.e. if it touches the interferometer arms that hold the retroreflector.
If it does not, go to the Maint menu, switch on the laser and press Home.
When the lever is in the home position, go to the Maint menu and switch on the
laser. Make a Scan. Observe the piezomotor and the lever. They have to move
unobstructed.
When the scan reaches 4708 data points, at the point where the motor changes
direction, the distance between the lever and the wall of the spectrometer should be
2mm or more. If the lever touches the wall before it reaches 4708 data points, then
the lever needs to be replaced. Contact eralytics for a spare lever.
If the motor stops somewhere before 4708 data point without obvious reason, then

11
press Home.
The lever is runs between two black blocks with a glass plate to limit the up-down
movement of the lever. Please move the lever forth and back by hand and check if it
can be moved easily and if it can be moved up-down a little bit in all positions. If not,
the two blocks may bee too close together. In this case, remove the 2 screws of the
block. The distance between the upper and lower blocks is defined by 8mm long M3
spacers. Add one M3 washer to each of the 2 spacers and install the blocks again
with the screws. Now check again if the lever moves easily. If so, switch on the laser
and make a scan to verify that it reaches 4708 data points now.
If all this does not solve the problem and the ERASPEC still does not reach 4708
data points, then proceed as described in the next section.
In any case, switch off the laser and close the interferometer lid and the instrument.

3.10.3 Checking the drive parameters

If the procedures described in the two previous sections were not successful to
locate the problem, and the ERASPEC still cannot reach 4708 data points during a
scan, please go to the Maint-Data menu. Set the # Data to something close to but
smaller than the number of data the ERASPEC reached (for example, if the scan
reaches 3218 data points, set #Data to 3000).
Then go to the menu Maint-Drive. Switch on the laser, wait 3 seconds, then press
the button “t-Scan” in the Drive submenu. It will do a scan
Transfer the file in.ifg to a PC, using FileZilla as described in the Sec. “Instructions
for FileZilla”. Use a graphics program to display the data in the file in.ifg.
The data should be centered around the value of t-set in the drive menu (e.g. if t-
set=36, then the data will be around 36), with deviaitions of no more than ±2. If there
is a larger scatter around the means value, especially towards the end of the scan,
then please increase the t-set value on the ERASPEC by 2 and retry the t-scan, data
scan and graphical data representation. If there is less scatter, you may try to
increase t-set further, but it should not be bigger than 42.
You can also try to decrease t-set, but it should not be smaller than 29.
On this way, find the t-set value where the scatter is smallest and store this value.
If changing t-set does not make the scatter smaller, then set t-set to the original
value and change the parameter fwd-Speed in the Drive submenu. The value range
is 68 to 85. Try to find the value for fwd-Speed again where the scatter is smallest
and store this value.
Then, with the new T-set and/or fwd-Speed values, go to the Maint-IR menu and set
# Data to 4708. Store this value.
Then switch on the laser and make a scan to check if it can reach 4708 data points
now.
Switch off the laser.

3.11 Error 14: Data Base: File Open Error

This error is shown if the memory reserved for libraries is full. Please remove at least
one data base that is not used any more and retry.

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3.12 Error 15: Data Base: Singular Matrix
This error is shown if, by an incredibly improbable coincidence, a column or row in a
data base is nonzero and equal to or a linear combinations of another column or row.
In this case, this column or row has to be identified and deleted from the data base
(by exporting it to a memory stick, manipulating it using Excel, and importing the new
data base again, as described in the sections “Export of libraries to a memory stick
(flash drive)” and “Import of libraries from a memory stick (flash drive)” in the
EREASPEC operation manual.

3.13 Error 16: No Data in Data Base

One of the active libraries contains no data or only zeros in a peak area column used
in the MLR model. Please delete this data base or move it to the inactive box, as
described in the sections “Removing a data base” and “Deleting a data base”, or add
data to it, as described in the section “Adding a sample to a data base”.
Another possibility is to change the model for MLR by removing the parameter that
has only zeros from the calculation, as describe in the EREASPEC operation
manual.

3.14 Error 17: No Reference

If this error occurs, please measure a reference spectrum manually, as described in
the section “Manual start of a reference spectrum measurement”.

3.15 Error 18: Reference File Open Error

If this error occurs, please measure a reference spectrum manually, as described in
the section “Manual start of a reference spectrum measurement”.

3.16 Error 19: Error at Execution of Background Processes

If this error occurs, please retry the measurement.
If you get the same error, please switch the instrument off, wait until the LED and the
display become dark, and then switch it on again. When the instrument is ready,
retry the measurement. In virtually all cases, it will work now.
If you get the same error again, please contact eralytics.

3.17 Error 20: Mirror Drive Error

The mirror drive is synchronized with the laser and its speed and position are locked
to the laser signal. If it cannot be synchronized to the laser, this error is displayed.
If this error occurs, please retry the measurement.
If you get the same error, please switch the instrument off, wait until the LED and the
display become dark, and then switch it on again. When the instrument is ready,
retry the measurement.
If you get the same error again, please try the procedures given in the Section “Error
10: Scan: Wrong # of data points”.

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3.18 Error 21: No Reference
This error occurs mainly if the method EN238 is used.
If this error occurs, please measure an EN238 reference spectrum, as described in
the section “Measurement of an EN 238 reference spectrum”.
If it occurs in the normal gasoline method, please measure a reference spectrum
manually, as described in the section “Manual start of a reference spectrum
measurement”.

3.19 Error 23: Checksum Error

If data packages are corrupted during a measurement, the instrument will recognize
it, and then this error is displayed
If this error occurs, please retry the measurement.
If you get the same error, please switch the instrument off, wait until the LED and the
display become dark, and then switch it on again. When the instrument is ready,
retry the measurement. In virtually all cases, it will work now.
If you get the same error again, please contact eralytics.

3.20 Error and warning messages

The following text strings may appear to alert the user about an irregularity that has
occurred during a measurement:

3.20.1 Check Inlet Filter

If the measured density of the sample is below 0.65 g/cm3, then the density meter
was not completely filled, and this warning is displayed. Please exchange the metal
inlet filter in the Luer inlet, as described in the Section “Maintenance - Changing the
inlet filter” of the ERASPEC operation manual.

3.20.2 Cell position

If the time for the absorption cell to reach the correct position is unexpectedly long,
then this error is displayed.
If this error occurs, please switch the instrument off, wait until the LED and the
display become dark, and then switch it on again. When the instrument is ready,
retry the measurement.
If you get the same error again, please proceed as described in Section “Error 7:
Timeout Error Position of Absorption Cell”.

3.20.3 Checksum Error

This is the same error as Error #23 (Checksum Error) described in the Section “Error
23: Checksum Error”. Please refer to this section.

3.20.4 Data Size Error

This is the same error as Error #10 (C Scan: Wrong # of Data Points) described in
the Section “Error 10: Scan: Wrong # of data points”. Please try the procedures
given in this section.

14
4. Other possible malfunctions
In this section, some possible problems are described that do not cause an error or
warning message.

4.1 Instrument does not start

If the ERASPEC, after switching on, does not start, and the display remains dark,
then please remove the case and check if all ribbon cables are properly and tightly
connected to the respective boards.
Press on all such connectors to ensure proper connection.

If this does not help, unplug the power cable. Check the connectors of the thick,
black cable that runs between the processor board (the lower board on the left side
of the instrument) and the display board (which sits directly on the back of the
display). Press on the connector on the processor board, and use a screwdriver to
press on the connector on the display board.
The plug the power cable in and try again.

If still this does not help, then please check if the LED at the upper right corner of the
power board (the upper board on the left side of the instrument) is blinking. If not,
please check the power connection.

4.2 Intensity of reference is low

If the intensity is too low, please try to realign the retroreflector as follows:

The retroreflectors are the two cylindrical, silver parts with gold coated ends mounted
on the rotating, L-shaped mount. One of them can be aligned with two headless
screws. These two screws are located on the brass plate behind the retroreflector
close to the absorption cell, as shown in the image below:

15
In the menu Maint, switch on the IR source and then laser. When the intensity
displayed by the IR detector has stabilized, perform a scan.
(From software version 129 on, the intensity will be displayed in the Maint submenu
Laser after the scan).
Switch the IR source and the laser off.

Using FileZilla, please transfer the file in.ifg from the …\tmp\ directory and determine
the height of the peak. The correct figure is the contrast, which is the difference
between the maximum and the minimum intensity, found usually between point #
350 and point # 1000 (i.e. contrast = Max – Min).

Then turn the upper headless screw with a 1.5mm Allen key clockwise, by about
1/16 turn (22.5°).
Make another scan, switching on the IR source and then laser before and after the
IR detector intensity has stabilized, as described above.
Again use FileZilla to transfer the new in.ifg file and determine the contrast. If it is
bigger than before, continue to turn stepwise, always determining the contrast after
each turn, until the contrast decreases, then turn screw to the position at which the
highest contrast was found.

If the contrast after the first turn of the upper screw is smaller than before, please
turn back, then turn 1/16 turn in the other direction, and perform scan and calculation
of contrast. Proceed until the contrast decreases, then turn screw to the position at
which the highest contrast was found.

16
After that, perform the same alignment with the lower headless screw.

In this way, the retroreflector is aligned so that the highest possible contrast is
achieved.

17
5. Instructions for FileZilla
ERASPEC can be connected via the ethernet connector on the rear panel to a LAN
or directly to a PC.
FileZilla is a free ftp client software that can be downloaded, e.g., from the website
http://filezilla-project.org/ . Pleas download and install the FileZilla client version!

5.1 LAN connection

Connect the ERASPEC and the computer to the LAN.
Switch on the ERASPEC and wait until ERASPEC is ready.
If the ERASPEC is switched on already, please wait about one minute before
starting FileZilla on the computer.

Then start FileZilla on the computer.

To connect, enter the middle part of the serial number in “Address:” (or “Server:”), as
shown below. (For example, for the ERSPEC serial number ES7010590, enter
ES105. You can also check this name in the test menu System-Net on the
ERASPEC: The field “name” shows what shall be entered in FileZilla Address).

Instead of the ERASPEC name, in “Server” in FileZilla you can also enter the IP
address of the ERASPEC, shown in the Menü System-Net in the box IP Adress.

In “User:” in FileZilla, enter user.

The password is result, please enter this password in the FileZilla Password box.

ATTENTION: For ERAPECs delivered before 2010, it may be necessary to use

ftpuser as “User” and NO password (i.e. leave the password box on FileZilla blank)
to connect.

Then click on “Quickconnect” to connect:

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If you get no connection, then go to the menu System-Network on the ERASPEC.
Check the IP address.
If the IP address field is not empty and is NOT 192.168.1.217, then the ERASPC is
connected to the LAN. Enter the IP Address of the ERASPEC in the FileZilla
Address and “Quickconnect”. Now you should be connected.
If the IP address of ERASPEC is 192.168.1.217, or if this field is empty, then check
the field DHCP. Then press the button “Apply”. Wait until the IP address changes to
something different than 192.168.1.217. Then enter the IP Address of the ERASPEC
in the FileZilla Address box and “Quickconnect”. Now you should be connected.

5.2 Direct connection to a computer

Connect the ERASPEC and the computer with an Ethernet cable.
Set the computer to “use fixed IP address” in the TCP/IP protocol. Use the IP
address 192.168.1.xx, where xx can be any number between 10 and 99.
Switch on the ERASPEC and wait until ERASPEC is ready.

19
If the ERASPEC is switched on already, please wait about one minute before
starting FileZilla on the computer.

Then start FileZilla on the computer.

To connect, enter 192.168.1.217 in the FileZilla Address box and ftpuser in the box
User. Then click on “Quickconnect”. Now you should be connected.

If you get no connection, then go to the menu System-Network on the ERASPEC.

Check the IP address. It has to be 192.168.1.217. If not, uncheck DHCP field and
press the button “Apply”. Wait until the IP address changes to 192.168.1.217. Then
enter this address in the FileZilla Address box and “Quickconnect”. Now you should
be connected.

5.3 File structure

Once you are connected, the following file structure is displayed:

The top field shows the exchanged commands and the status.
The right field (“Remote Site”) shows the directories in ERASPEC.
The left fields (“Local Site”) shows the directories on the computer.

20
Two directories on the ERASPEC are especially important:

user:
Click on the directory symbol on the ERASPEC side (left side). Then click
on the directory “user”:

21
The directory “lib” contains the libraries used for the cluster analysis and MLR stored
on the ERASPEC. It also contains a subdirectory rspec where all spectra of pure
compounds and background spectra are stored that the ERASPEC uses to calculate
concentrations.

The directory “var” contains the subdirectories “gas” for the data of the normal
gasoline measurements and “EN238” for the data of EN238 benzene
measurements.
Both contain subdirectories “ifg” where all sample interferograms are stored in
name.ifg format and the subdirectory “rifg” where all reference spectra
interferograms in name.rifg format are stored.

tmp:
Click repeatedly on the symbol of to move one directory up (symbol with two points)
until a list is shown that contains the subdirectory “tmp”. This is a file for temporary
data. It contains several data files from the last measurement. If a new measurement
is made, these data files are overwritten with the new data.

22
Click on tmp:

The data files are stored in ASCII format and can be read using a text editor or a
spreadsheet program. The stored files are:
a) in.ifg: The interferogram of the last measurement or the data if “Scan” was
pressed in the Maint menu.
b) ref.ifg: The interferogram of the current reference spectrum.
c) in.spc: The absorption spectrum of the last measurement (used for
concentration measurements)
d) in1.spc: The self-deconvoluted spectrum of the last measurement (used for
the predictions, i.e. for RON, MON, distillation etc.).
e) fits.dat: The theoretical spectrum fitted to the measured absorption spectrum
f) ipdata: is a system file with no importance here

ATTENTION: The list of data files in the “tmp” directory is not automatically
refreshed or updated after a measurement. After each measurement, it is
necessary to download the new data to this directory by pushing “F5” on the
computer!

23
Return to the initial menu:
Click repeatedly on the symbol of to move one directory up (symbol with two points)
until a list is shown that contains the subdirectory “home”.
Click on home. You will be back to the initial menu:

5.4 Data transfer from ERASPEC to the PC

Select a directory on the computer to which the data shall be downloaded. Use the
list of available directories in the left field “Local Site” in FileZilla to select the desired
directory.
Update the data list on FileZilla using the “F5” key (see above). Make a right click on
the name of the respective ERASPEC file and click on “Download” in the drop-down
list that appears.
The respective file is downloaded from ERASPEC and stored on the computer in the
selected directory under the same name.

24
5.5 Data transfer from a PC to the ERASPEC
Select a directory on the computer from which the data shall be transferred. Use the
list of available directories in the left field “Local Site” in FileZilla to select the desired
directory and select a file in the field below.
Make a right click on the name of the respective computer file and click on “Upload”
in the drop-down list that appears.
The respective file is uploaded from the computer to ERASPEC and stored there in
the currently selected directory under the same name.

ATTENTION: If you transfer .rifg (reference interferograms) and / or .ifg

(measurement interferograms) to the ERASPEC, then a restart or a change of the
measurement type (e.g. Gasoline => Diesel and back) is necessary.
Only after that, the newly uploaded data are shown in the Result menu and are
shown on the list that appears when the “Load” button in the Measure menu on user
level 6 is used.

5.6 Disconnect from FileZilla

It is not necessary to disconnect from FileZilla. Simply close FileZilla on the
computer to disconnect, and/or unplug the Ethernet cable.

25
6. Disassembling and Assembling Instructions
6.1 Removing and installing the housing
The ERASPEC analyzer can be operated with full functionality even without the
housing.
For optical inspection and accessibility the housing can be removed.

Please refer to the section “Changing the IR source” in the ERASPEC operation
manual for instructions how to remove and reinstall the housing.

6.2 Removing the Luer inlet

1) Unscrew the M4 nut holding the Luer inlet and remove the serrated washer.

2) Pull the inlet out as far as the tubing allows.

3) With a wire cutter, cut the cable strap that secures the yellow plastic tube on the
barbed fitting.
3) Pull the tube off the barbed fitting.

6.3 Installing the Luer inlet

1) Run the yellow plastic tube in the bore of the aligning rail and push it onto the
barbed fitting on the Luer inlet.
2) Secure the the tube on the barbed fitting with a suitable cable strap (the cable
strap should be about 2 to 2.5mm wide). Tighten the strap and cut off the excess
strap.
3) Place the Luer inlet onto the aligning rail, install the serrated washer and fix it with
the M4 nut.

6.4 Removing the outlet

1) Use an open end wrench to loosen the outlet.

26
2) As soon as possible turn the outlet disc to remove it.

6.5 Installing the outlet

1) Put the outlet through the bore of the aligning rail and screw on the disc as far as
possible. Finally place the disc so that the groove snaps in the aligning rail.
2) Tighten the outlet with an open end wrench.

6.6 Exchanging the laser assembly

The laser assembly consists of the laser mounted on an aluminum block, the upper
plate, the lower plate, and the thermoelectric element. In case a laser needs to be
replaced, this whole assembly is exchanged.
The temperature sensor that monitors the laser temperature is usually not
exchanged.

ATTENTION! During all operations described below, never touch the laser
itself. Always touch the laser assembly only at the upper or lower plates!

Please proceed as follows:

I) Laser Assembly Exchange:

27
1) Switch off the ERASPEC and open the lid of the spectrometer.
2) Open the plastic screw that holds the temperature sensor in place and remove
this screw and the plastic washer.
3) Take the temperature sensor out of the hole.
4) The laser and the thermoelectric element are connected to the connector board
on the front of the spectrometer (the 2-pin connector marked blue and the 4-pin
connector marked red). These connectors are on the inside of the spectrometer.
Unplug these connectors.
6) The analog board (the board inside spectrometer) is screwed with 2 screws that
go through the black plastic block which holds the IR detector, and 1 short screw.
Remove these 3 screws and the one serrated washer at the short screw (please be
careful that the IR detector stays on the board).
7) Lift the analog board and tilt it.
8) The cables of the laser and the thermoelectric element go below the analog
board, below the parabolic exit mirror, through small cable brackets, and below the
parabolic entrance mirror. Pull out these (and only these) cables of the laser and the
thermoelectric element. Please be careful that the mirrors and other optics are not
touched.
9) Open the two screws on the bottom plate of the laser assembly and remove these
two screws and the serrated washers.
10) Take out the laser assembly.
11) Put the new laser assembly in place.
12) Install the two screws and the serrated washers. Rotate the assembly so that the
laser is approximately parallel to the spectrometer wall and tighten the screws.
13) Install the cables of the laser and the thermoelectric element so that they run
below the parabolic mirrors, through the same cable brackets as before, and under
the analog board.
14) Connect the laser connector to the 2-pin blue connector and the thermoelectric
element connector to the 4-pin red connector on the connector board.
15) Put the analog board back in place. ATTENTION! Please be very careful so that
none of the cables running below the analog board are squeezed between the board
and the spacers in which the board is mounted!
16) Mount the analog board to the spectrometer using the 2 long screws through the
IR detector block and the serrated washer and the short screw on the other side.
17) At the laser assembly, insert the temperature sensor into the hole on the top
plate into the cooling block.
18) Fix the temperature sensor in place with the plastic screw and washer the same
way as it was done before. This completes the laser assembly exchange.

II) Laser Alignment:

19) Switch the ERASPEC on. When the display turns white and shows the eralytics
logo and name, please press the “RUN” hard key. Keep it pressed until the normal
measure menu is displayed.
20) If the ERASPEC starts a reference measurement, please press “STOP” to stop
this.
21) Go to the menu Maint, submenu Laser.
22) Set the laser temperature Tset to 27°C and the laser current Cur to 165.
23) Wait until the laser temperature is 27 °C, then switch the laser on.
24) If it emits intense green light, it´s OK. If not, try to change Cur and/or Tset until it
emits intense green light.

28
25) The laser beam goes towards a small, lower plane mirror tilted at 45°. The mirror
is glued to a silver block which is mounted on the mirror holder. Below the mirror,
there is a steel pin in the bottom of the spectrometer. The mirror holder can be
rotated around this steel pin.
26) Observe the laser beam. It should strike the plane mirror directly above the
center of the steel pin or a little (0.5mm or less) behind the center, i.e. towards the IR
source or toward the parabolic entrance mirror.
27) If it does, fine.
If the laser beam strikes off the center of the steel pin towards the beam splitter, or if
it more than 0.5mm off center towards the parabolic entrance mirror, then loosen the
two screws with which the laser assembly is mounted in the spectrometer. Rotate
the laser assembly a little so that the laser beam strikes the plane mirror in the zone
described above. ATTENTION! Never touch the laser itself. Always rotate by
touching only the black upper plate of the laser assembly!!
When the laser beam hits the mirror in the allowed position, tighten the two screws
with which the laser assembly is mounted in the spectrometer again.
28) Now the laser strikes the first lower plane mirror at the position it should. This
lower plane mirror directs the laser beam towards the beams splitter. Before the
beam splitter, there is a plate with an aperture (a 10mm hole). In this plate, below the
10mm hole, there is a smaller hole covered with a glass plate. The laser beam has to
pass cleanly through this hole, i.e. it shall not touch the plate. Please observe the
laser beam after this aperture with a white piece of paper.
29) If the laser beam does not pass cleanly through this glass-covered hole, the
lower plane mirror in front of the aperture can be adjusted until it does so in two
ways:
Up-Down: Using a 6mm wrench, rotate the silver block to which the mirror is
glued. The height of the laser beam can thus be adjusted until it passes
through the hole.
Left-Right: Loosen the one screw with which the mirror holder is screwed to
the spectrometer. Then the complete mirror assembly can be rotated around
the steel pin. This moves the laser beam left or right. Adjust this position so
that the laser beam passes through the small hole in the aperture.
30) If the plane mirror has been adjusted correctly, the laser beam now passes
cleanly through the glass-covered hole. Check with a white paper after the hole. On
the white paper, a small circular spot from the laser must be visible, with no or only
very faint scattered light.
31) Now the laser beam enters the interferometer correctly and cleanly on the
bottom (below the IR beam). It is divided in two partial beams by the beam splitter
and reflected by the two retroreflectors, recombined to one beam at the beam
splitter, and leaves the interferometer on top if the IR beam. You can follow the beam
paths with the white paper.
32) Due to reflections on both sides of the beam splitter, in the interferometer and
after recombination, there two or even three closely spaced beams, as can be seen
on the white paper. The main beam is the beam closest to the side of the IR source,
entrance aperture, and photodiode. The other beam(s) closer to the brass lever and
retroreflector are of no interest here.
33) After recombination of the two laser beams after the beam splitter, there is a
second, upper plane mirror between the beam splitter and the absorbance cell, also
tilted at an angle of 45°. This upper plane mirror directs the beam towards the
photodiode which is the black mount with a small hole in front.

29
34) The laser beam should strike this upper plane mirror near the bottom edge,
between the middle of the mirror and the tip (i.e. closer to the photodiode than to the
retroreflecor).
35) If the beam position on this upper plane mirror is not correct, adjust this position
Left-Right and Up-Down by performing the respective adjustments of the first, lower
plane mirror, as described under 29.
36) Now the laser beam strikes the photodiode. If you look along the laser beam in
the direction of the photodiode, the left-hand beam (the main beam) has to pass
through the hole in front of the photo diode, and the right-hand beam has to be
blocked. This can be achieved by adjusting the second, upper plane mirror in the
following ways:
Up-Down: Using a 6mm wrench, rotate the silver block to which the mirror is
glued. The height of the main beam can thus be adjusted until it passes
through the hole in front of the photodiode.
Left-Right: Loosen the one screw with which the mirror holder is screwed to
the spectrometer. Then the complete mirror assembly can be rotated around
the steel pin. This moves the laser beam left or right. Adjust this position so
that the main beam passes through the small hole in front of the photodiode.
37) Now the left-hand beam (the main beam) passes through the hole in front of the
photo diode, and the right-hand beam is blocked. This completes the alignment of
the laser.

III) Temperature and Current of the Laser:

38) Go to the menu Tests. Select the function “Burn-in” and press Start. The laser
temperature is varied between 5°C and 35°C repeatedly. The entire procedure lasts
12 hours. Please leave the ERASPEC on until this procedure is fineshed.
39) Then, in the same menu, select the function “Auto set” and press Start. The laser
temperature is varied between 20°C and 34°C in steps of 1°C. At each temperature,
a scan is performed, and Amin and Amax (the smallest and highest laser
amplitudes) are shown in the table on the right. This procedure lasts about 15 to 20
minutes.
40) From the table, please select the laser temperature so that Amin is as high as
possible while Amax is below 170.
41) Go to the menu Maint, submenu Laser, and enter the so selected laser
temperature in the box next to Tset. Then go to the submenu Misc and save this new
Tset with the buttons “Save params” and “Save EE”.
42) Return to the submenu Laser. Switch on the laser and wait for 5 to 10 seconds.
Then start a scan with the “Scan” button. The scan has to be completed, 4708 data
points have to be taken.
43) After the scan, observe Amin and Amax. Amin must be above 30, and Amax
must be lower than 170.
44) If that´s the case, switch off the laser. ERASPEC will run again fine.
45) If not, please adjust Cur and/or Tset until a scan is completed with Amin >30 and
Amax<170. Please save any new Tset or Cur values with the buttons “Save params”
and “Save EE” in the submenu params!

30
7. Special tools, supplies, and spare parts
In order to be able to perform all kinds of service work, certain special tools are
necessary, as well as certain supplies and spare parts that should be kept in the
inventory. This section gives a list of such items.

Special ERASPEC tools:

The special ERASPEC tools will be supplied by eralytics free of charge. Please
demand them from eralytics.

- Hook with handle (needed to unhinge the spring that pulls down the
interferometer arm)

- Socket wrench size 7 (metric), one side of the hexagon milled off (needed for
the connectors of the Teflon sample tubes inside the spectrometer)

- Open-ended wrench size 6 (metric), grinded to reduce its width (needed for
alignment of the small plane mirrors)

- Allen key size 1.5 (metric), one leg shortened (needed for the alignment of the
retroreflectors)

- Diffusor (Scotch Tape Magic) (needed for the visualization of interference

fringes during the alignment of the retroreflectors)

Supplies:

- Grease (Lithium or mineral based grease, do not use Silicon grease!!!),

should be of comparatively low viscosity: For lubricating the spindle and rail of
the absorption cell and the bearings and steel ball of the lever

- Thread locker, medium strength (Loctite 243 or similar): For locking the
screws of the peristaltic pump

- Dry Silicagel bead size 1-3mm with color indicator: For refilling the silicagel
bottle

Recommended spare parts:

- IR source
- Inlet filters 15 µm
- Pump head for peristaltic pump, complete with tubing
- Sampling tube with Luer connector
- Outlet tube
- Protective film for touch display
- Bottle with dry Silicagel

31
8. Configuration of the result.txt file
The file “result.txt” contains the results of all measurements of the ERASPEC Result
memory in csv format, as described in operation manual in the Section “The result.txt
file”.

If a customer does not want to have all the results in this file, it is possible to delete
columns of the result.txt file so that it then contains only the information that the
customer wants.

8.1 Modifying the result.txt file using FileZilla

A modification of the result.txt file can always, for all software versions that create a
result.txt file, be done using FileZilla, as described in the section “Instructions for
FileZilla”.
For software V1.27 or lower, this is the only possibility to upload a modified result.txt
from the PC to the ERASPEC.

When the ERASPEC is connected to the PC, go to the directory

../home/user/var/gas/ for the gasoline method result file or to
../home/user/var/diesel/ for the Diesel method result file.
Download the result.txt file.

Then, on the PC, copy the result.txt file so that a copy of the original file which
contains all the possible columns is retained.

Then open the result.txt file with Excel. The format is .csv (Comma Separated
Variables).
Delete all the unwanted columns by marking the respective column and the
command “Delete Cells”.

Save this modified result.txt file. Please make sure that it is saved in the .csv format
and that its name is still result.txt!

Then, in FileZilla, delete the result.txt file in the ERASPEC from the directory from
which you have downloaded it.
Upload the modified result.txt file from the PC to the same ERASPEC directory
where it was originally downloaded from:
../home/user/var/gas/ for the gasoline method or
../home/user/var/diesel/ for the Diesel method.

For future measurements, only the results for the parameters in the remaining
columns are stored in the result.txt file.

If the customer wants an additional parameter in the result.txt file that was deleted,
then this column can be inserted easily.
Download the result.txt from the ERASPEC to the PC and open it with Excel. Either
insert a column and write the correct header (i.e. the name of the parameter as it
appears in the ERASPEC submenu Column of the Result menu), or copy that
column from the copy of the original result.txt file (the file before any modification)

32
into the current result.txt file.
Save the result.txt file (again in .csv format) and upload it to the ERASPEC. Then, for
all future measurements, this additional parameter will be stored in the result.txt file.

8.2 Modifying the result.txt file using a memory stick (SW ≥ 128)
For software V1.28 or higher, a modification of the result.txt file can also be done
using a memory stick.

Save the result.txt file to a memory stick, as described in the section “Saving results
and raw data on a memory stick (flash drive)” of the operation manual.

Then, on the PC, copy the result.txt file so that a copy of the original file which
contains all the possible columns is retained.

Then open the result.txt file with Excel. The format is .csv (Comma Separated
Variables).
Delete all the unwanted columns by marking the respective column and the
command “Delete Cells”.

If a column shall be added to the result.txt file, insert a column and write the correct
header (i.e. the name of the parameter as it appears in the ERASPEC submenu
Column of the Result menu).

Save this modified result.txt file. Please make sure that it is saved in the .csv format
and that its name is still result.txt!

Then, delete the result.txt file on the ERASPEC, as described in the section
“Deleting the “result.txt” file and creating a new one” of the operation manual.

Connect the memory stick where the modified result.txt is stored to the ERASPEC.
Wait a few seconds so that the memory stick can be properly mounted.
Set the User Level to 6.
Go to the menu System - General. In the box “Option files”, press the button Load.
The following box appears on the display:

33
Move back 4 times. The sequence of directories that will be shown is:

34
35
Open the directory results:

Open the directory eraspec:

36
Open the directory named like the serial number of the ERASPEC you use:

Open the directory gas or diesel, depending on the method for which the result.txt
was modified:

37
Touch the line file type and select “All Files (*):

The result.txt file is now shown:

38
Touch result.txt to mark it, then press open to store this result file on the ERASPEC:

The modified result.txt file is now stored on the ERASPEC and will be used for all
future measurements.

39
9. Screenshots
It is possible to save the current display of the ERASPEC in a bitmap file (.bmp) on a
connected memory stick. This file can then be copied into manuals or other
documents or can be used for customer reference.

The screenshot works in all languages and for all characters. The bmp file will
always contain what is currently shown on the ERASPEC display.

On the memory stick that you want t use, create a directory \screenshot\ (directly in
the root directory of the memory stick).
Connect this memory stick to the ERASPEC.

On the ERASPEC, set the user level to 6.

Go to the menu System – submenu App:

Wait until the button UnMount becomes active, this idicates that the memory stick is
properly mounted.
Then mark the small white box left of “Screenshot mode” to activate the screenshot
function.

To save the current display on the memory stick, press the on/off button for less than
2 seconds. The ERASPEC will beep to indicate that the current display has bee
saved to a bmp file on the memory stick.
The name of the file on the memory stick is “screenx.bmp”, where x is a number. X
will be 1 for the first screenshot and will always be increased by 1 for further
screenshots:

40
To remove the memory stick, please go back to the menu System – submenu App
and press UnMount. Wait until UnMount becomes inactive, then remove the memory
stick.
Deactivate the screenshot mode by unmarking the small white box.

If the screenshot mode is active, and you need to switch off the ERASPEC, you have
to press the on/off button for at least 5 seconds.

If the ERASPEC is switched off with the screenshot mode active, this mode will
automatically be inactivated when the analyzer is switched on again. To activate it
again, please proceed as describe above.

41
10. Storing temporary files on a memory stick
It is possible to store the temporary files after each measurement on a memory stick.

A memory stick has to be connected to the ERASPEC that contains the following
subdirectory:

\results\eraspec\”Serial Number”\gas\tmp\ for the gasoline method

\results\eraspec\”Serial Number”\diesel\tmp\ for the Diesel method

If the connencted memory stick has these subdirectories, then after each
measurement, the following files will be stored in the respective subdirectory …\tmp\:
a) in.ifg: The interferogram of the last measurement
b) ref.ifg: The interferogram of the current reference spectrum.
c) in.spc: The absorption spectrum of the last measurement (used for
concentration measurements)
d) in1.spc: The self-deconvoluted spectrum of the last measurement (used for
the predictions, i.e. for RON, MON, Cetane number and index, distillation
etc.).

The data files are stored in ASCII format and can be read using a text editor or a
spreadsheet program.

ATTENTION:
The data files in the “tmp” subdirectory on the memory stick are overwritten if
a new measurement is performed.
If data files for several measurements are needed, it is necessary to connect
the memory stick to a computer after each measurement, save the data on the
computer, and reconnect the memory stick to the EARSPEC!

42