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Title: Accurate Humidity Calibration: From The Laboratory To The Plant Site
Author: Bob Hardy
Source: 1992 Measurement Science Conference
Year Published: 1992
Abstract: All humidity instruments normally receive a basic calibration in the laboratory under closely controlled environmental conditions. These instruments are then shipped to the plant site, exposed to rough handling, vibration, and pollutants. The end user must then install and/or use these instruments and assume them to be operational with valid calibrations. How can the user be assured of an accurately calibrated instrument, one that will provide accurate measurements when connected to his process or data retrieval system? A mobile instrument of versatility and convenience for producing atmospheres of known humidity is described. Humidities may be varied from 10% to 95%, the temperatures from 0C to 7OC, the air flow from 2 to 20 standard liters per minute. The humidity is entered, controlled automatically, and maintained constant to an accuracy of 1% relative humidity. This mobile humidity reference allows the determination of plant site humidity instrumentation accuracies without removing the instruments from the plant location.

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