Measurement and Control of Compressed Air Systems [Application Note]
Published by – March 31, 2016
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Kahn Instruments can offer a variety of hygrometers that are suitable for the measurement or control of compressed air quality. The Easidew range of capacitive hygrometers provides simple on-line or portable measurement of compressed air dewpoint. The range includes three products, all based around the core Easidew Transmitter, which is a fully self-contained probe, powered by a 12 to 28V dc input and providing a linear mA output in °F dewpoint. This transmitter can be used alone, providing an output into a controller or external monitoring system or coupled with an easy-to-install display unit that provides transmitter excitation, digital display, milliamp output and a dual alarm. Completing the range is the Easidew Portable, providing digital display and milliamp
output and featuring an integral re-chargeable battery pack and a full sampling system with filtration, flow and pressure regulation. Easidew Transmitter and On-Line versions give continuous measurement and the Easidew Portable is a convenient instrument for regular spot-checks at point of use of the compressed air. Additionally, the Cermet II Hygrometer which is a sensor/monitor combination with intelligent digital display that offers multiple engineering units, mA, voltage and RS232 output options with up to four alarm contacts. The HygroPort Portable Hygrometer also offers multiple engineering units and features an in-built data-logger
for storing up to 360,000 measurement points and a re-chargeable battery system. Both the Cermet II and HygroPort can take an auxiliary pressure input for active pressure compensation if required. Kahn also offers the Easidew I.S. Dewpoint Transmitter. This is a FM/CSA certified instrument providing linear 4-20mA output and is suitable for use in most hazardous area applications, such as hydrogen and natural gas dryers.