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HMP240 series

M210300en User's Guide

8.2 Temperature (with additional T sensor head)

Measurement range -40...+180 °C

Typical accuracy at +20 °C (+68 °F) ±0.1 °C

Typical temperature dependence of

electronics 0.005 °C/°C

Temperature sensor Pt 100 RTD DIN IEC 751,

class 1/4 B

8.3 Calculated variables

Without the additional temperature head only dewpoint temperature and

mixing ratio are available.

Typical ranges

relative humidity 0...100 %RH

dewpoint difference 0...+50 °C

mixing ratio 0...500 g/kg dry air

absolute humidity 0...600 g/m

wet bulb temperature 0...+100 °C

Response time (90 %) at +20 °C in

still air (with sintered filter) 15 s

Accuracies of the calculated quantities depend on the accuracies of the meas-

ured quantities: relative humidity and temperature. In the dewpoint accuracy

graph and accuracy tables for x, a and Tw the accuracies of relative humidity

and temperature are assumed to be ±(0.5 + 2.5 % of the reading) %RH for

humidity and 0.1°C for temperature (at 25°C). Note that the user can select

whether the HMP240 calculates the frostpoint (default) or the dewpoint when

the dewpoint is < 0 °C. In addition, the HMP240 also calculates the dewpoint

difference, i.e. the difference between the ambient temperature and the

dewpoint ( = dT).

8.3.1 Relative humidity (with additional T sensor head)

Accuracy (including nonlinearity and repeatability)

maximum achievable accuracy when calibrated against high quality,

certified humidity standards: +(0.5 + 2.5 % of the reading) % RH

for example, accuracy at:

0 % RH +0.5 % RH

60 % RH +2.0 % RH

Response time (90 %) at +20 °C in

still air (with sintered filter) 15 s

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Vaisala HMP243 Guía de usuario Pagina 65