OM-40 Series Portable Low Cost
Data Loggers Part of the NOMAD
$
65
Basic Unit
⻬ Measure and Record
Temperature,
Relative Humidity,
DC Voltage or
DC Current Input
⻬ Stores up to 7943
Readings
⻬ Compact Size
⻬ Easy-to-Use
Windows Software
The OM-40 Series data loggers
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
data logger 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 data logger 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 10.6 cm (4") wire which is
mounted on the circuit board inside
the snap lid of the data logger 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).
OM-41 data logger, $65, shown
larger than actual size
Specifications
GENERAL
Measurement Capacity:
7943 readings
Measurement Interval: User
selectable from 0.5 sec to 9 hrs
Memory Modes: Stop when full,
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 per
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
(included)
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)
E-37
®
Family
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)
Temperature Measurement
Accuracy/Resolution
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
(user-replaceable internal
sensor) 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)
Relative Humidity Measurement
Range vs. Temperature
Windows Software-Data Plot.
Windows Software-Data logger Setup.
OM-44 data logger,
$109, shown smaller
than actual size.
OM-43, $99,
data logger
smaller than
actual size.
Sensor Type: Resistive
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-HT-B (for use in
water or soil): -40 to 50°C
(-40 to 122°F)
OM-40-C-HT-B (for use in air):
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 kΩ
Accuracy: ±10 mV ±1% rdg
Resolution: 10 mV (8-bit)
Output Power: 2.5 Vdc
at 2 mA, active only during
measurements
-40 to 100°C (-40 to 212°F)
Sensor Type: Thermistor
Input Connection:
2.5 mm stereo phone jack
ALL MODELS AVAILABLE FOR FAST DELIVERY!
To Order
(Specify Model Number)
Model No. Price Description
OM-41 $65 Temperature data logger
OM-42 72 Temperature/external input data logger (takes one external input)
OM-43 99 Temperature/relative humidity data logger
OM-44 109 Temperature/relative humidity/external input data logger (takes up to two external inputs)
OM-40-C-HT-B 39 External temperature sensor for use with Models OM-42 and OM-44 (high temperature range,
OM-40-C-V 11 External 0 to 2.5 Vdc voltage input cable for use with Models OM-42 and OM-44
OM-40-C-I 19 External 4 to 20 mA input cable for use with Models OM-42 and OM-44
RD-TEMP-SW-A 59 Windows 98/NT/2000/XP software and RS-232 interface cable with DB9F termination
OM-40-BATT-6 20 Replacement 3.0 V lithium battery for OM-40 Series data loggers (package of 6)
for use in air or water) 1.8 m (6') cable
for OM-40 Series data loggers
E
Data loggers are supplied with complete operator's manual and mounting kit (hook/loop, magnet and tape).
Ordering Example: OM-44 data logger, OM-40-C-HT-B
and
RD-TEMP-SW-A
Windows software, $109 + 39 + 11 + 59 =
external temperature sensor,
$218.
OM-40-C-V
voltage input cable,
E-38
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EPG05
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