Using a chilled mirror hygrometer for accurate measurements of RH in industrial applications

A new humidity calculator is now available from Michell Instruments’ website for download and online use.


Polymer capacitance moisture sensors are the most common technology used to measure relative humidity. They are both fast-responding and highly cost-effective.

However, in many industrial applications – such as power generation – using a chilled mirror hygrometer is desirable since they are highly reliable and have virtually no drift. The Michell Optidew 501 is a rugged chilled mirror hygrometer, developed specifically for demanding industrial applications. It uses a new design of chilled mirror sensor that gives it a speed of response that is comparable to a polymer moisture sensor.

Our blog post, How a Michell chilled mirror hygrometer measures relative humidity, explains how to choose the right instrument and what calculations it uses to provide reliable readings of relative humidity in industrial applications.

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Date: 25 March 2021
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Written & issued by Michell Instruments Ltd.