Michell Instruments
Many relative humidity (RH) instruments installed in high-humidity applications suffer from poor reliability because the electronics are exposed to the harsh, damp environment. The miniature PCmini52 probe overcomes this problem with electronics that are encapsulated in a protective resin. This protection gives the instrument an IP 65 rating and enables the probe to provide reliable RH measurements, no matter how high the surrounding humidity. The transmitter uses a capacitive thin-film polymer sensor, which either absorbs or releases water vapor as the RH of the ambient air rises or drops. These sensors offer both a fast response and excellent sensitivity to fluctuations in humidity, says the company. — Michell Instruments, Ely, U.K.