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Vaisala’s HMD112 Humidity and Temperature Transmitter provides reliable, precision humidity and temperature measurements in HVAC and cleanroom applications. The HMD112 boasts an RH accuracy of +/-2%RH and is equipped with the HUMICAP 180R sensor. The long-term stability of the 180R sensor lessens maintenance needs during the transmitter’s lifetime. Even more, the HMD112 can be field calibrated with an HM70 Hand-Held Humidity and Temperature Meter or a PC connection.
Note - 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
| Performance | |
| RELATIVE HUMIDITY | |
| Measurement range | 0 ... 100 %RH |
| Accuracy | |
| Temperature range | +10 ... +30 °C (+50 ... +86 °F) |
| 0 ... 90 %RH | ±2 %RH |
| 90 ... 100 %RH | ±3 %RH |
| Temperature range | -20 ... +10 °C, +30 ... +60 °C (-4 ... +50 °F, +86 ... +140 °F) |
| 0 … 90 %RH | ±3 %RH |
| 90 … 100 %RH | ±4 %RH |
| Temperature range | -40 ... -20 °C (-40 ... -4 °F) |
| 0 ... 100%RH | ±4 %RH |
| Stability in typical HVAC applications | ±0.5 %RH/year |
| Humidity sensor | Vaisala HUMICAP® 180R |
| TEMPERATURE | |
| Measurement range | -40 ... +60 °C (-40 ... +140 °F) |
| Accuracy | |
| At +20 °C (+68 °F) | ±0.2 °C (±0.36 °F) |
| Temperature dependence | ±0.01 °C/°C |
| Temperature sensor | Pt1000 RTD Class F0.1 IEC 60751 |
| CALCULATED PARAMETERS | |
| Measurement range for dew point temperature and wet bulb temperature | -40 ... +60 °C (-40 ... +140 °F) |
| Measurement range for enthalpy | -40 ... 460 kJ/kg (-10 ... +190 BTU/lb) |
| Accuracy of the calculated parameters should be calculated at the actual condition based on the RH and temperature specification. | |
| Accuracy at 20°C (68°F) and 80%RH: | |
| Dew point | ±0.7 °C (1.2 °F) |
| Wet bulb temperature | ±0.5 °C (0.9 °F) |
| Enthalpy | ±1.6kJ/kg (0.7 BTU/lb) |
| Factory calibration uncertainty at 20 °C (+68 °F) | ±1.5%RH/±0.2 °C |
| Operating Environment (All Models) | |
| Operating temperature range | -40 ... +60 °C (-40 ... +140 °F) |
| Operating humidity range | 0 ... 100 %RH |
| Maximum wind/flow speed | 30 m/s |
| Storage temperature | -40 ... +60 °C (-40 ... +140 °F) |
| Electromagnetic compliance | EN61326-1, Industrial Environment |
| Mechanics | |
| Max wire size | 1.5 mm2 (AWG 16) |
| Standard housing color | White (RAL9003) |
| Housing material | PC + 10%GF (UL-V0 approved) |
| Inputs and Outputs | |
| Analog output | 4 ... 20 mA, loop powered |
| Loop resistance | 0 ... 600 Ω |
| Supply voltage | 20 ... 28VDC at 600 Ω load 10 ... 28VDC at 0 Ω load |
| Data input for RDP100 Remote | RS485 |
| Panel Display | Vaisala proprietary protocol |
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