Tech Tip: When to Use a Hygrothermograph to Measure Humidity

Art galleries and research labs use hygrothermographs to monitor humidity in their environments. Galleries must avoid damage to precious artwork. Research labs must have documentation of humidity to ensure experiment integrity while high accuracy is not as crucial.

Oakton® Long-Cycle Hygrothermograph

Oakton® Long-Cycle Hygrothermograph

The theory behind hygrothermographs is based on the fact that human hair expands as it absorbs moisture from the air. The instruments use a bi-metal strip to measure temperature. A human hair bundle humidity sensor expands or contracts which causes levers to move. Pens on the levers trace humidity and temperature movements on graph paper.

Use a hygrothermograph if you need a reliable printout of temperature and humidity and seek real-time, interactive monitoring and recording. This helps to identify issues quickly. However, if the instrument will be subject to vibrations or bumps, it may be best to use another humidity measurement instrument. Data loggers can track additional parameters and are portable. Some offer alarms to alert users to conditions that exceed specified limits. However, some users prefer the immediacy of the hygrothermograph.

View our selection of hygrothermographs.

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