A new series of RH transmitters is designed to provide a stable, repeatable, and accurate means of measuring humidity only or humidity and temperature in the harshest of environments. The polymer capacitance sensor is not affected by condensation, fog, high humidity, or contaminants. The state-of-the-art sensor is designed for years of calibration-free service. The Series RH is a two-wire transmitter with a 4-20 mA loop powered output. The humidity/temperature version provides dual 4-20 mA output signals with an accuracy of ۬ percent RH and ۪.9°F at 72°F.