The HE-67xx Series Humidity devices house both a humidity and a temperature sensor in a wall or duct-mount style. The humidity sensor is capable of measuring Relative Humidity (RH) over the entire range of 0 to 100%, and its All-Polymer™ construction provides improved resistance to chemical corrosion. The TRUERH™ product line delivers devices with RH accuracy of either ±2% or ±3% RH. TRUERH™ humidity elements produce voltage output signals proportional to measured humidity for humidity indication. Temperature sensors are available in thin-film nickel, thin-film platinum, and silicon. The elements are powered with 14 to 30 VDC or 20 to 30 VAC and feature a user-selectable humidity output of 0 to 10 VDC or 0 to 5 VDC. Features TRUERH™ circuitry and calibration techniques for which patent protection is pending. All-Polymer humidity sensor patented sensing element provides accurate and reliable humidity sensing. Tested and calibrated with equipment certified to be in compliance with National Institute of Standards and Technology (NIST) guidelines. ±2% RH accurate model includes test and calibration equipment certificate of calibration conformance. Humidity and temperature sensors in one unit eliminates the need for separate sensors and reduces installation costs. User-selectable output voltage range allows choice of standard voltage outputs for use with systems in service or new systems. All-plastic material for duct probe improves thermal performance and complies with Underwriters Laboratories Inc.® (UL) flammability ratings for plenum use;complies with Blue Angel (Germany) andTCO'95 (Sweden) environmental regulations.