Dwyer WHT-322 is a weather-resistant humidity/temperature transmitter with a drift of less than 1% RH/year. It has a temperature range of -40 to 140°F (-40 to 60°C) and an accuracy of ±0.9°F @ 72°F (±0.3°C @ 25°C) for 4-20 mA output. It requires a power input of 10-35 VDC for loop-powered models and meets NEMA 3S (IP54) enclosure rating. The transmitter utilizes a capacitance polymer sensor with a humidity range of 0 to 100% RH and has removable screw terminal block for electrical connections. Its response time is 15 seconds. The transmitter is housed in an ABS enclosure and has a repeatability of ±0.1%. The temperature sensor for 4-20 mA output is a solid-state band-gap type, while the passive output uses a 10K @ 25°C thermistor. The humidity accuracy is ±2% RH for 20 to 80% RH and ±3% for 10 to 20% and 80 to 90% RH.