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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). |
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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) |
