The HS-D_2X Series are duct humidity transmitters. They use a highly accurate and reliable Thermoset-Polymer-based capacitance humid- ity sensor, state-of-the-art digital linearization, and temperature compensated circuitry in order to monitor humidity levels. The sensing element 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 against contaminants. Ex- cellent long-term stability and quick response time combined with temperature compensation make the HS-D_2X Transmitter Series the ideal choice for the HVAC market. Models with accuracy of 2%, 3%, or 5% are available.