Their relative humidity sensor website contains datasheets and technical articles. JDS Technologies sells a fully integrated relative humidity sensor. Rotronic Instrument Corporation offers instruments for the measurement of relative humidity, dew point, water activity, and other humidity parameters. Panametrics is a manufacturer and distributor of ultrasonic testing equipment and process control instrumentation. They also sell capacitive polymer relative humidity sensors.
Additional specifications are on the company's website.
The sensor is available in TO-18 header, unmounted chips, and wafers. Their EMD-2000 micro relative humidity sensor is a resistive type sensor intended for HVAC applications. When one deals with relative humidity there is often the need to change between different units such as converting dew point and temperature to percent relative humidity or wet bulb. Elmwood Sensors recently introduced a new ceramic-based humidity sensor to provide a stable and accurate measurement of relative humidity. Polymer-based humidity sensors tend to drift with time, and the company claims that their ERH 300 will not drift or lose accuracy over time and thus eliminates the need for recalibration.