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It is mainly used in drying processes or ventilation systems for calculating water content when the mass flow of gas is known. CALIBRATION IN PRACTICE 46 Saturation vapor pressure of water (p ws) The maximum pressure that water vapor can exist at a particular temperature. The higher the temperature, the more water vapor the gas can hold. Dewpoint temperature (td) Dewpoint is the temperature at which air becomes saturated when cooled and begins to condense, forming dew. At 100 % relative humidity the ambient temperature equals the dewpoint temperature.

Example humidity and temperature instruments traceability chain CALIBRATION ACTIVITIES 34 Temperature equilibrium The often spoken term “temperature equilibrium” is important but usually impossible to reach in most calibrations. When temperature equilibrium occurs, all of the components in the system are at same temperature and no heat flows occur. Usually there are heat-producing elements in the system like motors, electronics, operator or light sources. Also note that the heat radiated from the operator´s body is a heat producing element.

This means down time for the users normal calibration. Purchasing of even more measurement equipment will be required to bring the calibration of almost all measurement equipment in house. There may always be equipment that requires calibration from outside sources. Users may opt to send references directly to a National laboratory. This is the typical method for a high-end laboratory. Calibration at a National laboratory can be very expensive and may have an extremely long turn around time. The calibration traceability chain can be very confusing, especially when more links are added.

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calibration by Senthil

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