HMS112 Outdoor Humidity, Dew point, Wet bulb, Enthalpy and Temperature transmitter for HVAC, Current Loop or Modbus, 2% accuracy

The analog Vaisala HMS112 Humidity and Temperature Transmitter is designed for accurate humidity and temperature measurements outdoors. HMS112 includes an integrated radiation shield to minimize measurement errors from solar radiation. The transmitter is ideal for controlling cooling towers and for differential enthalpy control of economizers.

With RH accuracy of ±2 %RH, the transmitters have been calibrated with 3-point NIST traceable calibration (certificate included).

HMD112 transmitter is equipped with the proven HUMICAP® 180R sensor. The sensor’s superior long-term stability minimizes maintenance needs throughout the transmitter’s lifetime. If necessary, the transmitter can be field-calibrated using either an HM70 Hand-Held Humidity and Temperature Meter, or a PC connection.

See all Outside Air (OSA) Transmitters

The transmitters can be ordered either with a 4 ...20 mA output or Modbus RTU interface

Analog outputs are preset at the factory to:
Channel 1: 4 ... 20 mA = 0 ... 100% RH
Channel 2: 4 ... 20 mA = -40 ... +60 °C (-40 ... +140 °F) T

The package includes:

• HMS112 transmitter