Measuring humidity in extreme conditions

Paul Boughton

Measure humidity in harsh environments with the transmitter you can truly depend on. The Vaisala Humicap humidity and temperature transmitter series HMT330 is built for incredibly stable measurement in just about any environment – clean or dirty, hot or cold.

With multiple options to choose from the instrument can be tailored to meet the specific needs of each application. The latest generation Humicap sensor provides reliable measurement even in environments with high humidity or chemical contaminants.

Making quality measurements in high humidity conditions (over 90% RH) is always a challenge because it is so close to saturation. The HMT330 features warmed probe technology to handle these demanding conditions. Heating keeps the sensor – and indeed the whole probe, including the filter – at a temperature several degrees above the ambient. This ensures that water will not condense on the sensor.

In environments with high concentrations of chemicals and cleaning agents, the chemical purge option helps to maintain measurement accuracy between calibration intervals. The chemical purge heats the sensor at regular intervals to remove chemicals that may have accumulated over time. 

For more information,

Vaisala is based in Finland.

Recent Issues