The HS-D Series are duct humidity transmitters. They use a highly accurate and reliable Thermoset Polymer based capacitance humidity sensor and state-of-the-art digital linearization and temperature compensated circuitry to monitor humidity levels. The sensor is encapsulated in a 228.60 mm (9”) long by 12.7 mm (0.5”) diameter 304 S/S probe. A 60 micron HDPE filter protects the sensor from contaminants. A variety of enclosures are available. Excel¬lent long term stability and quick response time combined with temperature compensation make the HS-D Series the ideal choice for the HVAC market. All models are available with accuracies of 2%, 3% or 5%.