Home Page | CS 30 Overview

red_button.gif (982 bytes) Hygromer ® CS 30: Operating Limits 

Sensor Humidity Temperature Operating Limits
Exceeding the above limits will affect the sensor characteristic response and may permanently damage the sensor. In some cases, the sensor can be regenerated by baking it at 120 to 140 °C for a few hours.
Temperature Compensation of the Humidity Signal
As a general rule, the response of a humidity sensor is affected by temperature. Depending on the temperature range of the application, the electronic circuit associated with the CS 30 sensor should incorporate a temperature compensation so as to maintain measurement accuracy. The following table shows the compensation that should be added to the linearized humidity signal at different temperature and humidity conditions:

Humidity »
Temperature

 0 %RH 10%RH 35 %RH 50 %RH 80 %RH 95 %RH
-20 °C 0 %RH - 1.5 %RH - 2.0 %RH - 2.0 %RH - 1.5 %RH  
0 °C 0 %RH -1.0 %RH - 2.0 %RH - 2.5 %RH - 2.5 %RH - 2.5 %RH
23 °C 0 %RH 0 %RH 0 %RH 0 %RH 0 %RH 0 %RH
50 °C 0 %RH + 2.0 %RH + 3.5 %RH + 3.5 %RH + 3.5 %RH + 3.5 %RH
70 °C + 1.5 %RH + 4.0 %RH + 6.0 %RH + 6.0 %RH + 6.5 %RH + 6.5 %RH
100 °C + 3.0 %RH + 6.0 %RH + 9.0 %RH + 9.0 %RH + 9.5 %RH + 9.5 %RH
Example: when the sensor is exposed to 50 %RH at 50 °C, add 3.5 %RH to the humidity signal.

Notes:

The above table assumes that humidity calibration was done at the temperature of 23°C

Because relative humidity is normally calibrated at room temperature (here 23°C), the humidity sensor and associated electronics measure humidity in reference to liquid water even at temperatures below freezing.
At a temperature of -20°C, this means that the maximum reading is about 82 %RH, which corresponds to
100 %RH (saturation) when relative humidity is referred to ice.