The HC Series are capacitive humidity sensors produced in thin film technology. A capacitive humidity sensor is in fact a plate capacitor. A polymer layer is placed between a metal electrode and a coated glass substrate. The dielectric permittivity of the polymer depends on its water content. Due to careful selection of materials, to state-of-the-art production technology and to long experience in thin film technology, all humidity sensors have an excellent long term stability, the highest reproducibility of the humidity sensor characteristic and are wettable and very resistant to pollutants. They are used in all the standard transmitter series, as well as in a large number of customized and OEM products from mass- to high-end applications. The very good linearity of the humidity sensors enables the use of a simple, cost-effective oscillator circuitry with an easy and accurate calibration procedure. Extensive evaluation results such as from various long term tests or resistance to most chemicals of practical importance are available.

Typical applications: Handheld instruments, data loggers, meteorology, medical applications, automotive - air conditioning, home appliances, photocopy machines, (de)-humidifiers