Vaisala HMP155 User Manual download pdf (Page 16)

USER'S GUIDE____________________________________________________________________

14 _______________________________________________________________ M210912EN-C

Additional Temperature Probe Option

1206-038

Figure 2 HMP155 with Additional T-probe

The active output version of HMP155 can be ordered with an additional

temperature probe option, see Figure 2 above. When the additional T-

probe is in use, the relative humidity value is calculated based on the T

(dew point) value obtained from the humidity probe and the T

value

obtained from the T-probe.

When installing HMP155 with T-probe, it is important to make sure that

the humidity probe and the T-probe are installed in the same conditions

in order to get accurate readings. Even a slight difference in temperature

conditions between the T-probe and the humidity probe will result in

false RH readings. The two probes need to be installed so that the

humidity probe does not heat the T-probe, but is close enough for the

probes to share the same environment conditions. When the RH reading

is required, always install the T-probe in the place where you need the

reading from.

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Vaisala HMP155 User Manual Page 16