2021
DOI: 10.6028/nist.sp.250-83r1
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Calibration of hygrometers with the hybrid humidity generator

Abstract: We describe here the calibration of customer hygrometers using the NIST Hybrid Humidity Generator (HHG). This generator produces humidified air with water amount fractions (water mole fractions) ranging from 1.0 10?7 to 0.57 using calibration gas flows up to 150 standard liters per minute. At ambient pressure these amount fractions correspond to dew/frost points ranging from 90 C to +85 C. The HHG may be used to calibrate instruments measuring water amount fraction, such as cavity ring-down hygrometers. It … Show more

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Cited by 4 publications
(1 citation statement)
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“…The environmental chamber calibrations utilized a temperature-controlled test chamber within the NIST Hybrid Humidity Generator facility. The test chamber is a stainless-steel cylindrical enclosure housed inside of a commercial environmental chamber, as described in NIST SP250-83r1 [20]. A calibrated platinum resistance thermometer (PRT) mounted in the center of the test chamber was used to record the chamber reference temperature, with a standard temperature measurement uncertainty of 𝑒𝑒 𝐼𝐼𝑃𝑃𝑇𝑇 = 0.01 Β°C.…”
Section: Environmental Chamber Calibrationsmentioning
confidence: 99%
“…The environmental chamber calibrations utilized a temperature-controlled test chamber within the NIST Hybrid Humidity Generator facility. The test chamber is a stainless-steel cylindrical enclosure housed inside of a commercial environmental chamber, as described in NIST SP250-83r1 [20]. A calibrated platinum resistance thermometer (PRT) mounted in the center of the test chamber was used to record the chamber reference temperature, with a standard temperature measurement uncertainty of 𝑒𝑒 𝐼𝐼𝑃𝑃𝑇𝑇 = 0.01 Β°C.…”
Section: Environmental Chamber Calibrationsmentioning
confidence: 99%