MTP

USER’S GUIDE
Model MTP-ST-171
Humidity and Temperature USB Datalogger

ALM

REC

FEATURES
z Memory for 32,000 readings
(16000 temperature and 16,000 humidity readings)
z Dew point indication
z Status Indication
z USB Interface
z User-Selectable Alarm
z Analysis software
z Multi-mode to start logging
z Long battery life
z Selectable measuring cycle:
2s, 5s, 10s, 30s, 1m, 5m, 10m, 30m, 1hr, 2hr, 3hr, 6hr, 12hr, 24hr

DESCRIPTION

1. Protective cover
2. USB connector to PC port
3. Start button
4. RH and Temperature
sensors
5. Alarm LED (red/yellow)
6. Record LED (green)
7. Mounting clip

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LED STATUS GUIDE
Gr e e n LED

REC

ALM

Re d /Ye l l o w LED

LED STATUS GUIDE

LEDs Indication Action

REC ALM Start logging
Both LED lights OFF Replace battery
Logging not active and download
Or Low Battery the data

REC ALM To start, hold

One green flash every 10 sec. * the start button
Logging, no alarm condition** until Green and
Green double flash every 10 sec. * Yellow LED
Delayed start flash
logging, it will
Red single flash every 10 sec. * stop
REC ALM -Logging, low alarm for RH*** automatically.
Red double flash every 10 sec. * No data will be
-Logging, high alarm for RH*** lost. Replace
Red single flash every 60 sec. battery and
- Low Battery**** download data
Yellow single flash every 10 sec. *
-Logging, low alarm for
REC ALM TEMP***
Yellow double flash every 10 sec. Download data
*
-Logging, high alarm for TEMP*
Yellow single flash every 60 sec.
- Logger memory full

* To save power, the logger’s LED flashing-cycle can be changed to 20s or 30s via the supplied software.
** To save power, alarm LEDs for temperature and humidity can be disabled via the supplied software.
***When both temperature and relative humidity readings exceed alarm level synchronously, LED status indication alternate every cycle. For
example: If there is only one alarm, the REC LED blinks for one cycle and alarm LED will blink for next cycle. If there are two alarms, REC
LED will not blink. First alarm will blink for first cycle and the next alarm will blink for next cycle.

****When the battery is low, all operations will be disabled automatically. NOTE: Logging automatically stops when the battery weakens
(logged data will be retained). The supplied software is required to restart logging and to download logged data.

***** To use the delay function. Run the datalogger Graph software, click on the computer icon on the menu bar (2nd from left) or select
LOGGER SET from the LINK pull-down menu. The Setup window will appear, and you will see there are two options: Manual and Instant.
If you select the Manual option, after you click the Setup button, the logger won't start logging immediately until you press the yellow
button in logger's housing.

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SPECIFICATIONS
Relative Humidity Overall Range 0 to 100%
Accuracy (0 to 20 and 80 to ±5.0%
100%)
Accuracy (20 to 40 and 60 to ±3.5%
80%)
Accuracy (40 to 60%) ±3.0%
Temperature Overall Range -40 to +70 ℃
（-40 to +158
℉）
Accuracy (-40 to -10 and +40 to ±2℃
+70℃)
Accuracy(-10 to +40℃) ±1.0℃
Accuracy (-40 to +14 and 104 ±3.6℉
to 158℉)
Accuracy (+14 to +104℉) ±1.8℉
Dew point Overall Range -40 to 70 ℃
Temperature （ -40 to 158
℉）
Accuracy (25℃ , 40 to 100% ±2.0℃(±4.0
RH) ℉)
Logging rate Selectable sampling interval: From 2 seconds up to
24 hours
Operating -40 to +158℉（-40 to +70℃）
temperature
Battery type 3.6V lithium(1/2AA)(SAFT LS14250, Tadiran
TL-5101 or equivalent)
Battery life 1 year (typ.) depending on logging rate, ambient
temperature & use of Alarm LEDs
Dimensions/Weight 130x30x25mm / 45g

BATTERY REPLACEMENT
Only use 3.6V lithium batteries. Before replacing the battery, remove the module from the PC. Follow diagram and explanation steps, 1 through 4 below:
1. With a pointed object (e.g. a small screwdriver or similar), open the casing. Lever the casing off in the direction of the arrow.
2. Pull the data logger from the casing.
3. Replace/Insert the battery into the battery compartment observing the right polarity. The two displays briefly light up for control purposes (alternating,
green, yellow, green).
4. Slide the data logger back into the casing until it snaps into place. Now the data logger is ready for programming.
NOTE:
Leaving the module plugged into the USB port for longer than necessary will cause some of the battery capacity to be lost.

2 3 4

WARNING: Handle lithium batteries carefully, observe warnings on battery casing. Dispose of in accordance with local
regulations.Sensor Reconditioning Over time, the internal sensor may be compromised as a result of pollutants, chemical vapors, and other
environmental conditions which can lead to inaccurate readings. To recondition the internal sensor, please follow the procedure below:
Bake the Logger at 80°C (176°F) at<5%RH for 36 hours followed by 20-30°C (70-90°F) at>74%RH for 48 hour ( for re-hydration)
If permanent damage to the internal sensor is suspected, replace the Logger immediately to insure accurate readings.

Version 2.0,07/07 3
 MTP
Instruments
4409, Charleroi Street
Montreal-North, Que
Canada
H1H 1T6
Tel: (514) 326-7167
Toll Free Number: 1 888 326-7167
Fax: (514) 326-7835
email: info@mtpinc.com
Web Site: www.mtpinc.com

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