Temperature and Humidity Sensor


Observator’s Air Temperature and Humidity Sensor OMC-406 provides accurate and precise measurements of both temperature and humidity in two 4…20 mA outputs. The temperature sensor within this probe is a Pt100 element while the principle of humidity measurement is based on a capacitive measuring device.

The OMC-406 should be mounted on a OMC-422 Natural Aspired Anti-Radiation Shield, which is a naturally ventilated, multiplated shield, designed for ambient temperature and relative humidity sensors. The convenient size and weight of this type make it useful for a wide range of applications and it is recommended for all new installations.


Measuring range 0 to 100% RH

Accuracy at 23°C < ± 1.5% RH between 10 to 95%

Reproducibility < ± 0.5 %RH

Hysteresis for a 4 hour cycle < 1% RH

Time constant at 23°C < 15 sec.

Temperature error ± 0.5 % RH


Measuring range –40°C to +60°C

Accuracy < ± 0.5°C

Reproducibility < ± 0.1°C

Time constant 15 sec.

Measuring system Pt100, 1/3 DIN

Data Sheet