1981•Review of Scientific InstrumentsRequires access
Controlled humidity gas circulators
Sol M. Grüner
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Abstract
A programmable circulator capable of regulating the humidity of a gas stream over a wide range of humidity is described. An optical dew-point hygrometer is used as a feedback element to control the addition or removal of water vapor. Typical regulation of the gas is to a dew-point temperature of ±0.2 °C and to an accuracy limited by the dew-point hygrometer.