Vaisala hmt120 - Technical Data and Specifications; Measurement Performance and Environment

8. Technical Data
8.1 Specifications
Table 42 Measurement Performance
Property Description/Value
Relative Humidity
Measurement range 0 … 100 %RH
Accuracy (including non-linearity, hysteresis, and repeatability) at 0 … +40 °C (+32 … +104 °F):
0 … 90 %RH
90 … 100 %RH
±1.5 %RH
±2.5 %RH
Accuracy (including non-linearity, hysteresis, and repeatability) at -40 … 0 °C, +40 … +80 °C
(-40 … 32 °F, 104 … 176 °F):
0 … 90 %RH
90 … 100 %RH
±3.0 %RH
±4.0 %RH
Factory calibration uncertainty at +20 °C (+68 °F):
0 … 90 %RH
90 … 100 %RH
±1.1 %RH
±1.8 %RH
Humidity sensor Vaisala HUMICAPâ 180R
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)
Temperature sensor Pt1000 RTD Class F0.1 IEC 60751
Accuracy over temperature range:
At +15 … +25 °C (59 … 77 °F) ±0.2 °C (±0.36 °F)
At 0 … +15 °C and at +25 … +40 °C
(at 32 … 59 °F and at 77 … 104 °F)
±0.25 °C (±0.45 °F)
At -40 … +0 °C and at +40 … +80 °C
(at -40 … 32 °F and at 104 … 176 °F)
±0.4 °C (±0.72 °F)
Other Variables (Optional)
Dew point/frost point, wet bulb temperature, enthalpy, absolute humidity, mixing ratio, vapor
pressure, and saturation vapor pressure
HMT120 User Guide M211244EN-C
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