What is the difference between ABS humidity, RH, Dew Point, and Uncompensated Humidity Measurement?
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What is the difference between ABS humidity, RH, Dew Point, and Uncompensated Humidity Measurement?
faqid:
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BoxCar software gives you the ability to view humidity readings from different humidity data loggers as some or all of the following, dependent upon which model data logger you are using. The measurement channels that are available to you will be displayed in the enable/disable channel section of the data logger's launch screen.
- Absolute Humidity
- ABS stands for the absolute humidity. In a system of moist air, absolute humidity is the ratio of the mass of water vapor to the total volume of the system, measured in grams per cubic meter. The BoxCar absolute humidity reading assumes an ambient pressure of 14.7 psi. This will not affect your readings unless you are monitoring absolute humidity at high altitudes, or in closed containers that are exposed to temperature changes, which in turn creates a change in pressure.
- Relative Humidity
- The ratio of the existing amount of water vapor in the air to the maximum amount that the air can hold at that temperature.
- Dew point
- the temperature to which a sample of air must be cooled, while the mixing ratio and barometric pressure remain constant, in order to attain saturation by water vapor.
- Uncompensated
- The response of the RH sensor used in the multi-channel H8 loggers varies not only with RH but also with temperature. Uncompensated humidity does not include the temperature correction.
To display properly compensated RH values BoxCar takes the temperature data logged simultaneously with the uncompensated RH data and determines an RH adjustment factor. At +70
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