Measure and Record Temperature, Relative Humidity, DC Voltage or DC Current Input
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Stores up to 7943 Readings
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Compact Size
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East-to-Use Windows Software
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Models Available For
Temperature Input(With Internal and External Sensor)
Humidity
4-20 mA Input
0-2.5 vdc Input
These products are being discontinued. Please see
OM-70_Series and
OM-EL-USB-1 for possible alternatives.
OM-40 Series dataloggers can
record temperature, relative
humidity, 4 to 20 mA and 0 to
2.5 Vdc signals.
Model OM-41
measures temperature only
(internal temperature sensor).
Model OM-42 is a two channel
datalogger that measures
temperature (internal sensor)
and also one external signal
which can be an external
temperature probe, 4 to 20 mA
signal or 0 to 2.5 Vdc signal.
Model OM-43 measures
temperature and relative humidity
(internal sensors).
Model OM-44
is a four channel datalogger that
measures temperature and relative
humidity (internal sensors) and also
up to two external signals which can
be external temperature probes,
4 to 20 mA signals or 0 to 2.5 Vdc
signals. The internal temperature
sensor is on a 4-inch wire which is
mounted on the circuit board inside
the snap lid of the datalogger case.
Typically this sensor is left inside
the case and measures ambient air
temperature over the operating
temperature range of the logger
-20 to 70°C (-4 to 158°F). The
internal temperature sensor can
also be placed outside of the case,
for faster response time. When the
sensor is placed outside of the case
it is capable of measuring
temperatures from -40 to 120°C
(-40 to 248°F).
MEASUREMENT SPECIFICATIONS Temperature (internal
sensor) - All Models Measurement Range: sensor
inside case, -20 to 70°C (-4 to
158°F); sensor outside case,
-40 to 120°C (-40 to 248°F) Sensor Type: thermistor Accuracy: +0.7°C@21°C
(+1.27°F @ 70°F) , see plot in detailed specs(PDF) Resolution:
0.4°C (0.7°F) at 70°F Response Time (Still Air):
15 min typical with sensor inside
case; 1 min typical with sensor
outside case
Relative Humidity Models OM-43 and OM-44 Measurement Range: 25% to
95% RH at 80°F for intervals
of 10 seconds or greater, noncondensing
and non-fogging,
see plot in detailed specs(PDF) Accuracy: ±5%
5 to 50°C (41 to 122°F) Resolution: 0.4%
5 to 50°C (41 to 122°F) Response Time:
10 min typical in air
External Temperature Sensors (for
use with Models OM-42 and OM-44) Measurement Range:
OM-40-C-LT: 0 to 44°C (32 to 110°F); Not recommended for wet or moist environments.
OM-40-C-HT-B: -40 to 50°C
in water or moist soil; -40 to100°C(-40 to 212°F) in air Sensor Type: thermistor Input Connection:
2.5 mm stereo phone jack
External 4 to 20 mA Input
(for use with Models OM-42
and OM-44) Measurement Range:
0 to 20.1 mA Input Connection:
2.5 mm stereo phone jack
Accuracy: ±0.1 mA ±1% rdg Resolution: 0.4% of fs
External 0 to 2.5 Vdc Input
(for use with Models OM-42
and OM-44) Measurement Range:
0 to 2.5 Vdc Input Connection: 2.5 mm
stereo phone jack; external input
ground, input, switched 2.5 V output;
external input ground connection is
not the same as PC interface
connection ground and should not
be connected to any external ground Input Impedance: 10 kOhm Accuracy: ±10 mV ±1% rdg Resolution: 10 mV (8-bit) Output Power: 2.5 Vdc at 2 mA,
active only during measurements
GENERAL SPECIFICATIONS Measurement Capacity:
7943 readings Measurement Interval: user
selectable from 0.5 sec to 9 hrs Memory Modes: stop when
wrap-around when full
(user selectable) Memory: non-volatile EEPROM
memory retains data even
if battery fails
Operation: blinking LED light
confirms operation Time Accuracy: ±1 minute
week at 20°C (68°F) Operating Temperature:
-20 to 70°C (-4 to 158°F) Operating Humidity:
0 to 95% non-condensing Storage Temperature:
-20 to 70°C (-4 to 158°F) Power: 3.0 V lithium battery Battery Life: 1 year Dimensions:
68 H x 48 W x 19 mm D
(2.4 x 1.9 x 0.8") Weight: 29 g (1 oz)
† All dollar amounts on this site are shown in US currency.
Note: Dataloggers are supplied with complete operator's manual and mounting kit (hook/loop, magnet and tape). Ordering Example: (1) OM-41 Temperature datalogger, $72.00
