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Measurement range 0 … 100 %RH
Accuracy: 1) 2)
At +15 … +25 °C (+59 … +77 °F) ±1 %RH (0 … 90 %RH)
±1.7 %RH (90 … 100 %RH)
At −20 … +40 °C (−4 … +104 °F) ±(1.0 + 0.008 x reading) %RH
At −40 … +180 °C (−40 … +356 °F) ±(1.5 + 0.015 x reading) %RH
Factory calibration uncertainty
(+20 °C / +68 °F)
±0.6 %RH (0 … 40 %RH)
±1.0 %RH (40 … 97 %RH)
Response time (90%) at +20 °C (+68 °F) in still air:
HMP75 (with standard plastic grid) 17 s
HMP76 (with standard sintered bronze
filter)
60 s
HMP77 (with standard plastic grid and
stainless steel netting)
50 s
Typical long-term stability Better than 1 %RH / year
Temperature
HMP75 measurement range −20 … +60 °C (−4 … +140 °F)
HMP76 measurement range −50 … +120 °C (−58 … +248 °F)
HMP76 short time measurement range −50 … +180 °C (−58 … +356 °F)
HMP77 measurement range −70 … +180 °C (−94 … +356 °F)
Accuracy at +20 °C (+68 °F) ±0.2 °C (±0.36 °F), see the graph
below
