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Vaisala HUMICAP® Humidity and Temperature Transmitters HMT120 is designed for humidity and temperature monitoring in cleanrooms and are also suitable for demanding HVAC and light industrial applications.
Measurement Performance
| Relative Humidity | |
| Measurement range | 0 … 100 %RH |
| Accuracy 1) 2) | |
| At 0 … +40 °C (+32 … +104 °F) | ±1.5 %RH (0 … 90 %RH) ±2.5 %RH (90 … 100 %RH) |
| At −40 … 0 °C and +40 … +80 °C (−40 … +32 °F and +104 … +176 °F) | ±3.0 %RH (0 … 90 %RH) ±4.0 %RH (90 … 100 %RH) |
| Factory calibration uncertainty at +20 °C (+68 °F) | ±1.1 %RH (0 … 90 %RH) ±1.8 %RH (90 … 100 %RH) |
| Humidity sensor types | Vaisala HUMICAP 180R Vaisala HUMICAP 180V |
| Stability | ±2 %RH over 2 years |
| Stability in typical HVAC applications | ±0.5 %RH per year |
| Temperature | |
| Measurement range | −40 … +80 °C (−40 … +176 °F) |
| Accuracy over Temperature Range: | |
| At +15 … +25 °C (+59 … +77 °F) | ±0.1 °C (±0.18 °F) |
| At 0 … +15 °C and +25 … +40 °C (+32 … +59 °F and +77 … +104 °F) | ±0.15 °C (±0.27 °F) |
| At −40 … +0 °C and +40 … +80 °C (−40 … +32 °F and +104 … +176 °F) | ±0.4 °C (±0.72 °F) |
| Temperature sensor | Pt1000 RTD Class F0.1 IEC 60751 |
| Other Variables (Optional) | |
| Dew point/frost point, wet bulb temperature, enthalpy, absolute humidity, mixing ratio, vapor pressure, and saturation vapor pressure | |
| 1) Including non-linearity, hysteresis, and repeatability. 2) With HUMICAP 180V sensor, accuracy is specified only in operating temperature −20 ... +80 °C (−4 ... +176 °F). | |
Inputs and Outputs
| HMT120 2-Wire Transmitter (Loop-Powered) | |
| Current output signals | 4 … 20 mA |
| External loop voltage | 10 … 30 VDC (RL = 0 Ω) 20 … 30 VDC (RL < 500 Ω) |
| HMT130 3-Wire Transmitter | |
| Voltage output signals | 0 … 1 V, 0 … 5 V, 0 … 10 V or user defined between 0 … 10 V |
| Min. output resistance | 1 kΩ |
| Serial output | RS-485, non-isolated |
| Relay output | 1 relay (max. 50 VDC, 200 mA) |
| Supply voltage | 10 … 35 VDC 15 … 35 VDC (when output 0 … 10 V) 24 VAC (±20 %) |
| Current consumption at 24 VDC | 8 mA, if relay closed 15 mA |
| Max. additional error caused by the analog outputs after calibration at +20 °C (+68 °F) ambient temperature | ±0.1 % of FS output signal |
| Temperature dependence of the analog outputs | ±0.005 % of FS output signal |
Operating Environment
| Operating temperature of transmitter body, no display | −40 … +60 °C (−40 … +140 °F) |
| Operating temperature of transmitter body with display | −20 … +60 °C (−4 … +140 °F) |
| Operating temperature, HMP110 probe | −40 … +80 °C (−40 … +176 °F) |
| Storage temperature | −50 … +70 °C (−58 … +158 °F) |
| EMC compliance | EN 61326-1 and EN 55022 |
Mechanical Specifications
| IP rating | IP65 |
| Weight | 270 g (9.5 oz) |
| Probe cable lengths | 3 m, 5 m, 10 m - up to 50 m (9.8 ft, 16 ft, 33 ft - up to 164 ft) |
| Display (optional) | 128 x 64 resolution full graphics B&W display without backlight |
| Material | |
| Transmitter housing | PBT plastic |
| Display window | PC plastic |
| Probe body | Stainless steel (AISI 316) |
| Probe grid filter | Chrome coated ABS plastic |
| Connections | |
| Inputs and outputs | Screw terminals 0.5 … 1.5 mm² (AWG 20 ... AWG 15) |
| Probe interface | 4-pin M8 female panel connector |
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