The HS-O_2X Series are relative humidity transmitters for outside air. They use a highly accurate and reliable Thermoset-Polymer-based capacitance humidity sensor along with state-of-the-art digital linearization and temperature compensated circuitry in order to monitor humidity levels. A 60-micron HDPE filter protects the sensor from contaminants. Excellent long-term stability and quick response time combined with temperature compensation make the HS-O_2X Series the ideal choice for the HVAC market. Models with RH accuracy of 2%, 3%, or 5% are available.