The HS-O Series are relative humidity transmitters for outside air. They use a highly accurate and reliable Thermoset Polymer based capacitance humidity sensor and state-of-theart digital linearization and temperature compensated circuitry 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 Series the ideal choice for the HVAC market. All models are available with RH accuracies of 2%, 3% or 5%.