Vaisala HMS112 Specification

Bid Specification

1 (1)

2019-04-19

HMS112 Outdoor Humidity and Temperature Transmitters for HighAccuracy Measurements in Building Automation Applications

Features/Benefits:

▪Proven HUMICAP® 180R sensor for superior long-term stability

▪Measures relative humidity and temperature; dew point temperature, wet bulb temperature, and enthalpy outputs selectable

▪±2 %RH accuracy

▪NIST traceable calibration (certificate included)

▪On-site calibration with HM70 Hand-Held Meter or PC connection

▪Shield protects temperature and humidity probes from scattered, as well as, direct solar radiation and rain

▪Easy to install on a pole, horizontal beam or flat surface

Summary:

Outdoor mounted transmitter shall incorporate a thin film polymer capacitive HUMICAP® relative humidity sensor that is field replaceable (re-calibration in the field also required after replacement). Electronics to be protected in a NEMA4 enclosure. Accuracy to be ± 2% RH for the 0 to 90% RH range, and ± 3% RH from 90 to 100% RH between +10 ... +30 °C (+50 ... +86 °F). Sensor shall have a stability of ±0.5 %RH/year in typical HVAC applications. Transmitter to be loop powered by 10 to

28 VDC (RL = 0Ω) or 20 to 28 VDC (RL = 600Ω), provide a linear output signal of 4 to 20 mA corresponding to 0 to 100% RH, and operate over a temperature range of 40 ... +60 °C (-40 ... +140 °F). Temperature sensor to be a platinum 1000Ω RTD having a linear output signal of 4 to 20 mA corresponding to -40 ... +60 °C (-40 ... +140 °F). Accuracy to be ± 0.2°C (0.36°F) at 20°C (68°F). Transmitter shall have the ability to calibrate relative humidity, without disturbing operation, using a single point electronic field calibrator. NIST traceable calibration and certificate included. Shall have options to calculate and output additional parameters: dew point temperature, wet bulb temperature, and enthalpy.

Vaisala Model: HMS112 (Relative Humidity and Temperature)

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