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Accurate humidity despite exposure to volatile organic components

Volatile organic components (VOC) cause drift in humidity sensors, requiring a removal and resetting of the sensor. The Heated HYT 223 is IST’s newest member of the HYT product series and allows for an automatic reset without having to remove the sensor. When measuring humidity in environments with exposure to VOC, a drift occurs which over time causes faulty measurement results. The sensor needs to be removed and reset, which is not only time-consuming and requires regular re-calibration of the sensor, but ultimately amounts to maintenance costs

digital humidity and temperature module with an integrated micro-heater

Accurate humidity despite exposure to volatile organic components

Volatile organic components (VOC) cause drift in humidity sensors, requiring a removal and resetting of the sensor. The Heated HYT 223 is IST’s newest member of the HYT product series and allows for an automatic reset without having to remove the sensor.
 

When measuring humidity in environments with exposure to volatile organic compounds, a drift occursover time causes faulty measurement results. A warm-up procedure is effective to restore the performance to the calibrated output. However, removing the sensor from service for restoration means high maintenance costs. Innovative Sensor Technology IST AG has therefore developed a multifunctional digital humidity and temperature module with integrated microheating. Thanks to the automatic recovery procedure, operation can be maintained for a long time without deviation and with excellent accuracy.

Standard calibration settings: ± 1.8 % RH 0-90 % RH and ± 3.0 % RH at 90-100 % RH at 0 to 50 °C (custom options on request).

A unique feature of the HYT 223 module is the integration of a heating resistance structure directly on the humidity sensor chip, which enables efficient sensor recovery at temperatures ≥ 120 °C in the application. Therefore, the recovery procedure can be fast and, in addition, can be adapted to the operating conditions. A protective PTFE membrane filter directly on the RH/T module protects the sensor from particles and further improves long-term stability while facilitating compact mounting. Like all members of the HYT product line, the HYT 223 module withstands condensing conditions. Possible applications for the HYT 223 module range from industrial drying processes to environmental monitoring to medical devices.

Further specifications:

Operating range: 0% RH to 100% RH; -20 °C to +120 °C.       
Hysteresis: <1%RH

Long-term deviation (humidity/temperature): < 0.5% RH/a / < 0.05 K/a

Digital output: I2C protocol
Heating element: Pt50, <720mW