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Title: Devices For Moisture Measurement In Natural Gas
Author: A. R. Kahmann
Source: 1988 International School of Hydrocarbon Measurement
Year Published: 1988
Abstract: Of all the devices available for measuring water vapor content in gases. Bureau of Mines Type Chilled Mirror Dew Point Testers are the most widely used. These Testers determine water content in numerous natural and industrial gases, provide an accuracy better than 0.2F (Bureau of Mines tests), enable determinations in the field under adverse lighting, need not be recalibrated, and are easily transported and set up in the field. They have been so popular because they duplicate the conditions required by the definition of dew point: When a gas-water vapor is cooled out of contact with liquid water, the humidity of the water content remains constant, but saturation increases until it reaches 100 percent. Then moisture begins to condense. The temperature at condensation is known as dew point and can be converted with standard charts to moisture content. This determination is the classical method demonstrated in high school chemistry and physics courses. However, for the Bureau of Mines Dew Point Tester, the classical procedure has been modified to make it suitable for measuring dew point at high pressures. It is accomplished by enclosing a mirror, which is chilled by refrigerant and on which moisture condenses, in a pressure chamber. A window in the pressure chamber allows viewing of moisture condensation.

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