Dwyer WHT-330 is a weather-resistant humidity/temperature transmitter with a drift of less than 1% RH/year. It operates in a temperature range of -40 to 140°F (-40 to 60°C) and has a response time of 15 seconds. The transmitter's enclosure meets NEMA 3S (IP54) standards and it has a capacitance polymer sensor. The electrical connections are made through removable screw terminal blocks and the output signal can be either 4-20 mA, 0-10 V, or 0-5 V depending on the model. The transmitter has a storage temperature range of -40 to 176°F (-40 to 80°C) and an enclosure made of ABS. Its repeatability is ±0.1% and the hysteresis is ±1%. The RH sensor accuracy is ±2% for 20 to 80% RH and ±3% for 10 to 20% and 80 to 90% RH.