Humidity calibration and adjustment (in one point), Humidity calibration and adjustment, In one point) – Vaisala HMT310 User Manual

Page 77

Chapter 6 ___________________________________________________ Calibration and Adjustment

VAISALA ________________________________________________________________________ 77

Humidity Calibration and Adjustment (in One

Point)

Remove the transmitter unit from the mounting plate (see

22) and press the adjustment button once (see Figure 18 on page

Remove the probe filter (see instructions on page 65) and insert the

probe into the reference humidity (for example, use a humidity

generator such as the HMK 15 Humidity Calibrator or salt

solutions).

Let the sensor stabilize.

Issue the CRH command and press Enter.

Type C and press Enter a few times to check if the reading is

stabilized.

When the reading is stabilized, type the reference humidity after

the question mark and press Enter three times (to set the first RH

reference, acknowledge the “Press any key when ready …”

message, and leave the second reference point unset).

>crh

RH : 26.00 Ref1 ? c

RH : 26.00 Ref1 ? 33

Press any key when ready ...

RH : 26.00 Ref2 ?

OK indicates that the calibration has succeeded.

Take the probe out of the reference conditions and replace the

filter. When using the stainless steel filter, take care to tighten the

filter properly (recommended force 130 Ncm).

If needed, record the calibration information (text and date) to the

Reset the transmitter by issuing the RESET command. The

transmitter returns to normal mode.