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Model
ST-171
Temperature & Humidity
USB Data Logger
Instruction
Manual
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FEATURES
• Memory for 32,000 readings (16,000 temperature and 16,000 humidity
readings)
• Dew point indication
• Multi-mode to start logging
• Selectable measuring cycle: 2s, 5s, 10s, 30s, 1m, 5m, 10m, 30m, 1hr,
2hr, 3hr, 6hr, 12hr, 24hr
• User-selectable alarm thresholds for both temperature and humidity
• Status indication via red/yellow/green LEDs
• USB interface for set-up and data download
• Analysis software
• Long battery life
DESCRIPTION
1. Protective cover
2. USB connector to PC port
3. Start button
4. RH & temperature sensors
5. Alarm LED (red/yellow)
6. Record LED (green)
7. Mounting clip
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LED STATUS GUIDE
LEDs INDICATION ACTION
REC ALM
Both LED lights OFF:
Logging not active OR
Low Battery
Start logging, replace
battery and download
the data
REC ALM
Single green ash every
10s*: Logging, no alarm
condition** Double green
ash every 10s*: Delayed
start
To start, hold the start
button until Green and
Yellow LEDs ash
REC ALM
Single red ash every 10s*:
Logging, low alarm for
RH*** Double red ash
every 10s*: Logging, high
alarm for RH*** Single red
ash every 60s:
Low battery****
Logging will stop
automatically. No data
will be lost. Replace
battery and download
data.
REC ALM
Single yellow ash every
10s*: Logging, low alarm
for TEMP*** Double yellow
ash every 10s*: Logging,
high alarm for TEMP***
Single yellow ash every
60s: Logger memory full
Download data
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* To save power, the logger’s LED ashing-cycle can be changed to 20s
or 30s via the supplied software.
** To save power, alarm LEDs for temperature and humidity can be dis
-
abled 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 rst 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.
SPECIFICATIONS
Logging Rate: Selectable sampling interval from 2 seconds up to
24 hours
Operating Temperature: -35 to 80°C or -31 to 176°F
Battery type: 3.6V lithium (1/2AA) (SAFT LS14250, Tadiran TL-5101
or equivalent)
Battery life: 1 year (typically) depending on logging rate, ambient
temperature and use of alarm LEDs
Dimensions/Weight: 101x25x23 mm (4x1x.9”)/172g (6oz)
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BATTERY REPLACEMENT
Only use 3.6V lithium batteries. Before replacing the battery, remove the
data logger from the PC. Follow steps 1 through 4 below:
1. Use a pointed object (eg. a small screwdriver) to 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 briey 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.
Function Range Accuracy
Relative
Humidity
0 to 20% & 80 to 100%
20 to 40% & 60 to 80%
40 to 60%
±5.0%
±3.5%
±3.0%
Temperature -40 to -10°C & +40 to +70°C
10 to +40°C
-40 to +14°F & 104 to 158°F
+14 to +104°F
±2°C
±1°C
±3.6°F
±1.8°F
Dew point
Temperature
-40 to 70°C (-40 to 158°F) ±2.0°C (±4.0°F)
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NOTE:
Leaving the model plugged into the USB port for longer than necessary
will cause some of the battery capacity to be lost.
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.
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