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1-18 What instrument is used to measure the dew point of compressed air?
The unit of pressure dew point, measured by various instruments like mirror dew point meters and electrolytic hygrometers, indicates compressed air's water content.
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Answer: Although the unit of pressure dew point is degrees Celsius (℃), its connotation is the water content of compressed air. Therefore, measuring dew point is actually measuring the water content of air. There are many instruments for measuring the dew point of compressed air, such as "mirror dew point meter" using nitrogen, ether, etc. as cold source, "electrolytic hygrometer" using phosphorus pentoxide, lithium chloride, etc. as electrolyte, etc. At present, special gas dew point meters are widely used in industry to measure the dew point of compressed air, such as the British SHAW dew point meter, which has a measurement range of up to 80℃.
