®

PurgEye 100 IP65

WELD PURGE MONITOR®

USER INSTRUCTIONS

Argweld® PurgEye® Family Range of Weld Purge Monitors®

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 INDEX PAGE 2

Index ...................................................................... 2
Introduction and features ...................................... 3
Understanding the monitor before turning on ........ 4
Understanding the monitor before turning on
continued ............................................................ 5
Methods of use ....................................................... 6
Turning on the monitor ............................................ 7
Calibration ............................................................. 8
Maintenance .......................................................... 9
Replacing the sensor ............................................... 10
Warning, use with caution ........................................ 11
Zero calibration ...................................................... 12
Zero calibration continued ........................................ 13
Spares and accessories ........................................ 14
Troubleshooting and fault finding ......................... 15
The family series of Weld Purge Monitors® ........ 16
Other languages ................................................. 17
Customer support and worldwide care .................. 18
Warranty ............................................................. 19
Address and contact details ................................. back cover

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 INTRODUCTION and FEATURES PAGE 3

The PurgEye® 100 ‘IP65’ Sealed Weld Purge Monitor® has been
specifically designed for the welding industry and provides a low
cost, high accuracy device for basic Weld Purge Monitoring.

The PurgEye® 100 IP65 features include:

• IP65 Sealed standard accredited.

• Dustproof sealed rated to level 6 (dust tight).
• Waterproof sealed to level 5 (protected against water
jets).
• A newly developed user replaceable electrochemical sensor.
• A sturdy presentation case with swivel hinge design for safe
storage of the instrument.
• User calibrate button for both 20.9% and 0.1% levels of
oxygen and below.
• Quick connect/disconnect ‘leak tight’ purge line connections.
• One piece ‘leak tight’ stainless steel sampling probe and
hose connector.
• Rubber aspirator bulb (sampling pump).
• 2 x AA batteries (included).
• Tripod mount with various tripod models available as
accessories.
• Wrist/neck band mount together with auto break safety strap.
• Optional rubber protector for monitor housing.
• Range 20.94% ambient to 100 ppm with zero calibration
facility.
• Battery replacement indicator.
• Sensor replacement indicator.

Argweld ® PurgEye® Family Range of Weld Purge Monitors®

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 Understanding the MONITOR PAGE 4

BEFORE TURNING ON

Sensor Housing Connectors

The ‘leak tight’ sensor housing connectors are designed to accept 6
mm OD polyurethane purge gas tubing for its low oxygen outgassing
rates and best weld purging results.
Small lengths of this tubing will be supplied with your PurgEye®
instrument, so that you can join your normal purge exhaust hose
as required.
We recommend that you purchase your desired length of
polyurethane purge tubing from HFT® to eliminate leaks that might
arise from joining multiple purge hoses together.

Connecting the Purge Gas Tubing © HFT®

The weld purge gas inlets and exhaust
tubes simply push into the two tube
connectors on the sensor housing cover
as shown with the arrows on the picture.
It doesn’t matter which way around the
tubes are connected.
If the aspirator bulb hand pump is not
being used, always ensure that there is
an exhaust tube of at least 150 mm (6”)
in length connected to the other tube
connector (this may need to be longer
if using very low flow rates, in order
to prevent atmospheric oxygen from
migrating into the sensor chamber).

Extra 150 mm (6”) tail pipe is Tube connectors

included for free flow use

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 Understanding the MONITOR PAGE 5

BEFORE TURNING ON continued

The best way to use your Weld Purge Monitor® is to connect the
exhaust tube from your purging system to one of the quick fit
connectors on the front of the monitor. Then allow the exhaust
gas to flow freely over the sensor, out to atmosphere using the 6”
length of tube provided.
If that method is not practical, then use the probe and hand pump
to extract samples from the inside of the pipe or vessel. The probe
should be placed through a weld gap near the top of the purge
space and inserted so that the bottom of the probe only goes a
short way below the weld zone for most accurate results.
The weld joint must be taped and your probe inserted through the
tape and into the weld gap.
Should the purge gas exhaust be insufficient to use the monitor with
a free flow of exhaust gas (as described above) and if the vacuum
bulb and sampling probe are used instead, the aspirator bulb will
be attached to one quick fit connector on the front of the purge
monitor, while the sampling probe and tube is attached to the other
connector. (See diagram on next page).
Press the standby button once and the unit will turn on, initially
it will display four dashes on the monitor. This indicates that the
reading is over range (>40.00%).

Follow the full-scale calibration procedure to start using the monitor.

(See page 8).

© HFT®

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 METHODS of USE PAGE 6

Connections with Sampling Bulb

Connections with Bulb Pump
This diagram shows connections for
use with the ‘bulb’ as sampling pump.

Sensor Cover

Sample Probe Bulb Pump

As mentioned above, the PurgEye® 100 ‘IP65’ can be used with

a bulb as a sampling pump or connections for free flow.
In the case of free flow, always ensure that there is a minimum of
at least 6" (150 mm) in length of polyurethane tube connected to
the other pipe connector (see lower picture).

Sensor cover.
One piece leak tight probe and tube
assembly for sampling purge gas
through weld root (included).

© HFT®

Connections for Free Flow

Use this layout for zero calibration
with 1 L/min flow rate of 99.99% 150 mm (6")
argon gas. tail pipe
(included).

Tube to weld purge system.

© HFT®

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 TURNING ON the MONITOR PAGE 7

Installing the Batteries

Remove the battery cover on the rear of the device and install 2 x
AA size standard alkaline batteries, ensuring the polarity is correct.
Use only alkaline type AA batteries. Be careful not to lose the tiny
screw(s).

Turning on the Monitor (for the first time)

After installing the batteries, the monitor will automatically turn
on. There is no need to press the on/off button. The display shows
immediately 88.88 for a second and will then show a reading above
20.94.

Press the calibration button for the monitor to display 20.94, this
may need to be repeated when the monitor is first used.

Note: Follow the full-scale calibration procedure to start using the monitor,
(see special note overleaf).

Turning on the Monitor (thereafter)

Press the standby button on the right (on/off) and the monitor will
turn on. Initially it will display 88.88 on the screen a second. The
display will then show a reading above 20.94.

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 CALIBRATION PAGE 8

Full-Scale Calibration
Carefully remove the sensor housing cover (pull slightly and rotate
the black round cover to remove) to expose the sensor element to
atmospheric oxygen. Replace sensor cover after two minutes.

Then press and hold the calibrate button for 5 seconds. After this
time period the monitor will read ~20.94%. Leave the monitor a
few seconds to ensure the reading has stabilised (this may take a
couple of minutes after being switched on).

If the reading varies significantly then hold the calibrate button

again to re-calibrate the monitor.

Note: It is recommended that the calibration procedure be carried out each

time the monitor is used for a new job to ensure that the gas lines are not
retaining residual levels of argon gas and to ensure that the monitor is starting
with a reading of 20.94%.

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 MAINTENANCE PAGE 9

Low Sensor and Low Battery Indicators

When the instrument displays a flashing “!” in
the bottom left corner, it is indicating that it
is time to replace the sensor. See spare parts
list on page 14.

When the monitor displays the battery symbol, © HFT®

replace the batteries, see below.

Installing the Batteries

Remove the battery cover on the rear of the
device, being careful not to lose the screws,
and install 2 x AA size standard alkaline
batteries, ensuring the polarity is correct.
Use only alkaline type AA batteries.
© HFT®

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 Replacing the sensor PAGE 10

Installing a New Sensor

• Carefully remove the sensor housing cover.
• Always ‘gently’ rotate (quarter turn) the sensor housing cover
while fitting or removing.
• Remove the sensor using the sensor removal tool by hooking
it into the groove on the black part of the sensor, then simply
rest the removal tool against the monitor and lever the sensor
gently upwards.
• There is no membrane cover to remove on the sensor.
• After installation of the new sensor, reset the monitor by pressing
the power button and calibration button at the same time then
carry out the zero correction facility.

Note: No force should be applied to the sensor, the sensor housing or the sensor
cover. Do not squeeze the sensor with the sensor removal tool.

© HFT®

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 WARNING, USE with CAUTION PAGE 11

Zero Calibration (Correction) Facility

The PurgEye® 100 ‘IP65’ Weld Purge Monitor® is set for use by
our quality control procedures prior to the product shipping to you.

However, occasionally, it may be necessary to use the zero calibration

facility.

Please use the instruction on the next page for the zero calibration
facility with extreme caution.

Once the zero calibration facility has been used, it is vital that the
instrument is placed on the argon gas facility for the alloted time
schedule as shown on page 7.

The procedure in this instruction booklet should ideally only be

used after fitting a new sensor and not done randomly without
good reason.

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 ZERO CALIBRATION PAGE 12

When a new sensor is fitted or where greater accuracy is required

at very low readings, you may want to zero the monitor.

This is done by first completing the full-scale calibration procedure

above and then completing the following steps.

1. Switch the monitor on.

2. With older models, (non IP65 versions) we recommend that
you start with a “Reset”. Push the ‘Cal’ and the ‘On/Off’ buttons
simultaneously and hold for 20 seconds, until ‘Reset’ appears
in the display. Step 3 below is then unnecessary, so continue
from step 4.
3. Repeat the “Full Calibration” procedure (See page 8).
4. Connect the sample tube directly to a supply of 99.99% Argon
with a flow of 1 - 2 litres/min (2 - 4 CFH) using the freeflow
method. (See page 6).
5. When the monitor has been reading for about 10 minutes and is
displaying below 1%, press and hold the calibrate button for 5
seconds. The monitor will indicate calibration mode by flashing
‘CAL’ on the screen.

© HFT®

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 ZERO CALIBRATION PAGE 13

continued

6. Once the reading falls below 0.5% the monitor will wait for the
reading to stabilise and then take a reference reading, this should take
several minutes, the longer the better. Once this is complete the screen
will stop flashing ‘CAL’ ›and display ~0.00%.
7. Now repeat the full calibration by pushing the ‘cal’ button until ±20.94
appears in the screen.

Your Monitor is now

ready for use.

Again, do not randomly use this facility. It is preferable that this

zero calibration only be carried out when the PurgEye® 100 ‘IP65’
is fitted with a new sensor.

Note: The longer the purge time and the higher the purity of gas, the better
the low level accuracy.

We will gladly carry out the replacement sensor activity for you and
provide you with an up to date calibration certificate. Please ask
your nearest HFT® Distributor for a quotation, or contact us directly
at sales@huntingdonfusion.com.

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 SPARES and ACCESSORIES PAGE 14

Part Descriptions Order Code

Replacement sensor ................................................ APIS101
Sensor removal tool ................................................ APIS102
Protective rubber housing (shown below) .................. APIS103
Tripod (medium size) .............................................. APIS104
Auto break safety wrist and neck strap ..................... APIS106
Sampling tube 6 mm OD x 2 m length ......................... APIS108
‘Leak Tight’ stainless steel probe ............................ APIS109
Aspirator bulb (sampling hand pump) ....................... APIS110
Sensor housing cover ............................................. APIS111
Battery cover .......................................................... APIS112
Carrying storage and presentation case ................... APIS125
Calibration certificate ............................................. APIS150
(for quality control procedures only)
50m length purge tube ........................................... APIS

Note: Whenever the sensor is replaced: DO NOT apply force to the sensor or
the sensor housing as this can cause damage to your instrument.

© HFT®
Rubber protective cover Storage and carrying case supplied
available as an accessory with all new instruments

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 TROUBLESHOOTING and PAGE 15

FAULT FINDING

A Quick Guide in the Event of Problems

If the reading does not fall below 20.9% after a reasonable purge
time, or in the event that your reading does not pass your expected
level of oxygen, please do the following:
• Check that the correct purge tubes are used for the quick fit
‘leak tight’ connections in case air is leaking into the instrument.
• Check the purge gas quality at the source by taking your
PurgEye® 100 directly to the source (i.e. gas bottle) to verify
your purge gas quality as well as ensuring that the connections
are ‘leak tight’.
• Check the cleanliness of the components being welded.
• Could there be excessive cleaning material or dirt that might
be outgassing?

Note: Excessive oil and grease will outgas and may produce copious quantities
of oxygen until all contamination has been purged.

If you need to reset the monitor, begin by turning it off.

Then press and hold the “Cal” button and the “On” button
simultaneously. Hold both buttons until the word “reset” appears
on the screen.
You will then need to calibrate the monitor at 20.94% and at 0%.

© HFT®

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 Argweld® PURGEYE® FAMILY RANGE of PAGE 16

WELD PURGE MONITORS®

The World standard PurgEye® 100 IP65 Hand Held
• Push button ‘Auto Calibration’ feature at precisely 100 ppm as well as at ambient (20.94%).
• Leak tight probe assembly.
• Low battery indicator and low sensor indicator.
• Increased sensor reading range.
• Quick connect/disconnect leaktight fittings for gas purge tubing.

The PurgEye® 200 IP65 Hand Held with PurgeNet™

• Readings from 1,000 down to 1 ppm.
• Internal electro-mechanical pump with 1 l/m flow rate.
• USB lead included to control PurgeLog™ software.
• Long life, faster response sensor.
• Warning alarm levels between 1 and 999 ppm.
• Flow detection for accurate reading of gas samples.

The PurgEye® 300 Nano

• ‘New’ unique solid state long life sensor.
• Less than 60 seconds warm up time.
• No need to constantly calibrate, integrally mounted sensor.
• Low cost, small, lightweight monitor reads accurately to 10 ppm.

The PurgEye® 300 Plus with PurgeNet™

• Measures and indicates from 1,000 to 10 ppm (0.001%).
• A unique, fast response, lifetime sensor.
• PurgeLog™ data logging software* included.
• Internal alarm and security pin code facilities.
• 2m x 6mm polypropylene hose for inlet and outlet exhausts.

The PurgEye® 500 Desk with PurgeNet™

• PurgeLog™ data logging software* included.
• Reads PPM or Percentage.
• Specially designed, extra long life sensor with faster response.
• OLED screen with stunningly clear, bright figures and text.
• Reading from 1000ppm - 1ppm.
• Audible alarm features to indicate low and high levels of oxygen.
• Visual Alarm System as an accessory.
• Integral pump with flow rate 3.5 - 4 l/m.

The PurgEye® 600 Touch Screen

• Reads PPM or Percentage.
• PurgeLog™ data logging software* included.
• Large touch screen with on-screen graph of the current weld.
• Internal sampling pump with gas filtration.
• User port with two outputs to control welding equipment or activate alarms in the event of a rise in oxygen levels.
• No more wet cells to keep replacing and recalibrating.
• Quick fit and quick disconnect ‘leak tight’ purge tube fittings.

The PurgEye® 1000 Remote with PurgeNet™

• Comes with a hand held display and a 10 m lead as standard.
• Optional 100 m reel of outdoor cable with locking connectors.
• Reels of extensions cable can be connected to make longer leads upto 1 km!
• Easy to pull through pipes.
• 1” ø stainless sensor holder to place at the weld site inside pipes to send purge data to the monitor up to 1km away.

The PurgEye® 1500 Site IP68 with PurgeNet™

• Internal electro-mechanical pump with 3 l/m flow rate.
• USB lead included to control PurgeLog™ software.
• IP65 rated with the lid open, IP68 with lid closed.
• Warning alarm levels between 1 and 999 ppm.
• Flow detection for accurate reading of gas samples.
• Power on / off with standby button for sensor warm up.

PurgeNet™ controls the welding power sources such as orbital welders and any other automatic welding systems
to switch on and off according to oxygen levels, transferring data easily with the ability to link to external devices.

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 Other LANGUAGES in PROGRESS PAGE 17

Les autres langues sont actuellement dans le progrès. Pour le

moment, s’il vous plaît contacter votre Distributeur local

Andere Sprachen sind momentan im Gange. Kontaktieren Sie

vorläufig, bitte Ihren örtlichen Verteiler

Otros idiomas son actualmente en progreso. Para ahora, contacta

por favor su Distribuidor local

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 CUSTOMER SUPPORT and PAGE 18

WORLDWIDE CARE

For further information and support, please contact us at:

Internet: www.huntingdonfusion.com
Email: hft@huntingdonfusion.com
Tel: +44 (0) 1554 836 836
Worldwide Offices, Partners and Distributors are listed on our website
or contact us and we will direct you to the correct location

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 WARRANTY PAGE 19

All products are thoroughly tested to our Quality Control Procedures

prior to leaving our manufacturing facility. Should you encounter
a problem with your product, please notify us immediately upon
receipt.

Huntingdon Fusion Techniques HFT® warrants this product to be

free of defects in workmanship and material, with exceptions stated
below.

Warranty applies for normal and intended use of the product.

Huntingdon Fusion Techniques HFT® will not be held responsible

for any incorrect use of the product.

For further warranty information, please refer to our terms and

conditions.

All warranties shall not apply to any product or component which

has been repaired or altered by anyone other than Huntingdon
Fusion Techniques HFT®.

Huntingdon Fusion Techniques HFT® shall not be liable for indirect,

special, incidental or consequential damage or penalties and does
not assume any liability of Purchaser, or to others, for injury to
persons or property.

This warranty is in lieu of all other warranties, expressed and implied.

E&OE

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 © HFT®

API0100 IP65 UI-91 12-10-2017 ME

HUNTINGDON FUSION
TECHNIQUES HFT
Stukeley Meadow BURRY PORT Carms SA16 OBU United Kingdom (UK)
Tel +44 (0) 1554 836 836 Fax +44 (0) 1554 836 837
www.huntingdonfusion.com Email hft@huntingdonfusion.com
E&OE Copyright © HFT®. All rights reserved.
This publication may not be reproduced by any means without the written permission of Huntingdon Fusion Techniques HFT®

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