Humidity Sensor Chemical Sensitivity

Chemical vapors or pollutants

Exposure of the internal sensor to chemical vapors or high levels of pollutants may interfere with the internal sensor and cause a shift in both offset and sensitivity, resulting in inaccurate readings to be logged. This includes chemical hand sanitizers and other cleaning products. High levels of pollutants may cause permanent damage to the humidity sensor’s polymer.

Optimal Storage Conditions

For optimal Humidity logger storage, store units in original packaging in an air conditioned area. Storage temperature shall be in the  range  of 10°C to 50°C and humidity at 20 to 60%RH.  Ensure good ventilation (fresh air supply) in storage area to avoid high concentrations of volatile chemicals. Do not store units in the same room as solvents or any other strong smelling products. 

Re-conditioning Procedure

Exposure of the internal sensor to chemical vapors may interfere with the internal sensor and cause inaccurate readings to be logged. In a clean environment, this will slowly rectify itself. However, exposure to extreme conditions or chemical vapors will require the following reconditioning procedure to bring the internal sensor back to calibration state.80°C (176°F) at<5%RH for 36 hours (baking) followed by 20-30°C (70-90°F) at>74%RH for 48 hours (re-hydration) High levels of pollutants may cause permanent damage to the internal sensor.

Related articles

• Calibrating a Logger
• Logger Calibration Certificates
• Measuring temperature of liquids
• Replacing the battery of a Logger
• My TRED30/TREL30 logger is showing a wildly incorrect temperature

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