Temperature Humidity Alarm with Logging Capability - Discontinued


Temperature Humidity Alarm with Logging Capability | OM-THA2

Temperature Humidity Alarm with Logging Capability

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  • Audible and Visual Alarm
  • Digital Display
  • Log Up To 170 Days of Data
  • Relay Contacts For Remote Alarm or Auto Dialer
  • Remote Sensor


The OM-THA2 has been discontinued. Please see the OM-THA2-U as a possible alternative or contact our Data Acquisition Engineering department.

The OM-THA2 is a multi-function unit that monitors temperature, relative humidity and dew point, provides for out-of-range conditions and continuously logs data. It consists of a base unit with an easy to read display and a 4.6 m (15') remote sensor probe.

The alarm function monitors temperature, relative humidity and dew point once every second. If any of the readings reach an alarm threshold, the unit generates an alarm by turning on a beeper and a dry relay contact. The relay can be connected to a telephone dialer, light or bell. The delayed alarm feature can reduce false alarms by ignoring short duration alarm conditions. The unit will also generate an alarm on probe failure.

The logger function records the temperature, relative humidity and dew point into internal non-volatile memory at a user specified interval. The recording is performed continuously after the unit is turned on. No computer setup is necessary to start logging, and all logging settings can be viewed or changed through the front panel functions. When the internal memory becomes full the recording rolls over, overwriting the oldest recorded data. Logged data can be reviewed on a computer using the included Windows software while continuously recording new data.

All the operating settings of the OM-THA2 can be changed from the front panel, without the need for a computer. The two line display provides and easy to read means of viewing or changing settings.


Operating Temperature Range: -40 to 140°F (-40 to 60°C)
Operating Humidity Range: 0 to 95 %RH non-condensing
Temperature Accuracy: ±2°F (±1°C)
Temperature Resolution: 0.1°F (0.1°C)
Humidity Sensor: Polymer capacitive
Humidity Accuracy: ±2%RH
Humidity Resolution: 0.1%RH
Temerature Sensor: Solid state
Calibration: User calibration
for temperature and relative humidity
9.65 cm L x 2.79 cm dia (3.8 L x 1.1 dia)
Weight: 25 g (0.9 oz)
Cable Length: 4.6 m (15')

Operating Temperature Range: 32 to 132°F (0 to 54°C)
Storage Temperature: 0 to 130°F (-18 to 54°C)
Operating Humidity: 0 to 95% RH non-condensing
Power: 12 to 24 Vac/Vdc, 0.78W alarm active
Battery Backup: 9V alkaline battery
for 35 hrs operation during power outage
Relay: 5A/250V NO/NC
14 cm L x 11.4 cm H x 4.1” D
(5.5 L x 4.5 H x 1.6 D)
Weight: 245 g (8.6 oz)

Temperature/Relative Humidity Alarm: High/low temperature
and humidity alarms, condensation alarm
Alarm Delay: Up to 2 hrs, user-selectable
Alarm Indication: Audible/Visual/Relay

Sample Rate: 1 sec to 30 min, user-selectable
Data History Storage: 2 hrs to 170 days, depending on sample rate
Memory Capacity: 8150 samples for temperature,
humidity and for temperature, humidity and dew point
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