Chapter 6 ___________________________________________________Calibration and adjustment
VAISALA ______________________________________________________________________ 133
Use the adapter fitting for the probes of HMT334, HMT335,
PTU307 and HMT338.
5. Enter the CRH command and press ENTER.
CRH
6. Wait at least 30 minutes for the sensor to stabilize.
7. Type C and press ENTER a few times to check if the reading is
stabilized.
8. When the reading is stabilized, give the reference humidity after
the question mark and press ENTER.
>crh
RH : 11.25 Ref1 ? c
RH : 11.25 Ref1 ? c
RH : 11.25 Ref1 ? c
RH : 11.24 Ref1 ? c
RH : 11.24 Ref1 ? 11.3
Press any key when ready ...
9. Now the device is waiting for the high end reference. Insert the
probe head into a measurement hole of the high end reference
chamber (for example,. NaCl: 75 % RH chamber in the
humidity calibrator HMK15). Use the adapter fitting for the
HMT334, HMT335, PTU307 and HMT338 probes. Press any
key when ready.
10. Let the probe stabilize for about 30 minutes. You can follow the
stabilization by typing C and pressing ENTER.
11. When stabilized, type the high end reference value after the
question mark and press ENTER.
>crh
RH : 11.25 Ref1 ? c
RH : 11.24 Ref1 ? c
RH : 11.24 Ref1 ? 11.3
Press any key when ready ...
RH : 75.45 Ref2 ? c
RH : 75.57 Ref2 ? c
RH : 75.55 Ref2 ? c
RH : 75.59 Ref2 ? 75.5
OK
>
12. OK indicates that the adjustment has succeeded and the new
calibration coefficients are calculated and stored.Enter the
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