HMW92 Humidity, Dew point and Temperature Sensor for High Performance HVAC, Wall Model, Current Loop, 1.7% accuracy

The 2-wire 4-20 mA HMW92 transmitter is designed for use in high performance HVAC applications such as museums, laboratories, data centers, and production facilities. The transmitter is quick and easy to install and use on the field even without any special tools. The most common settings, such as metric/non-metric and relative humidity / dew point unit selections, can be easily changed with dip switches when the enclosure is open. The transmitter can also be ordered preconfigured for Dew point.

On-site calibration and adjustment is exceptionally easy. The sliding cover lid exposes offset trimmers for 1-point calibration of both humidity and temperature parameters. The included display makes adjustment clear and convenient by instantly indicating the effects of any changes. A service port enables 2-point calibration, using either a PC or the Vaisala HUMICAP® Hand-Held Humidity and Temperature Meter HM70.

The transmitter also features a user exchangeable humidity and temperature module, which can be ordered as a spare part. The module is delivered with a calibration certificate.

Analog outputs are preset at the factory to:

• Channel 1: 4…20 mA = 0...100% RH or
• Channel 1: 4...20 mA = -5...+55°C (+23...+131°F) Td (Dew point model)
• Channel 2: 4...20 mA = -5...+55°C (+23...+131°F) T

The package includes:

• HMW92 transmitter with a display and a sliding cover with either a display opening or a solid front
• Calibration certificate (ISO9001 compliant, traceable to NIST)
• User's Guide, multiple languages

Watch the installation video of Vaisala's HMW90 transmitter series: