Vaisala HMT310 - Manual (Page 71)

Chapter 7 ___________________________________________________Calibration and Adjustment
VAISALA _______________________________________________________________________ 71
6. When the reading is stabilized, type 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 ...
Now the device is waiting for the high-end reference.
High End Adjustment
7. After the low end adjustment, insert the probe into a measurement
hole of the high end reference chamber (for example, NaCl: 75 %
RH chamber in the humidity calibrator HMK15, please use the
adapter fitting 13.5 mm for HMT314, HMT315, HMT317, and
HMT318). Note that the difference between the two humidity
references must be at least 50% RH.
8. Let the probe stabilize for at least 30 minutes. You can follow the
stabilization by pressing any key, typing C and pressing Enter.
9. 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
>
OK indicates that the calibration has succeeded.
10. 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 is 130 Ncm.
11. If needed, record the calibration information (text and date) to the
memory of the transmitter, see CTEXT Set Calibration Information
Text on page 68 and CDATE Set Calibration Date on page 68.
12. Reset the transmitter by issuing the RESET command. The
transmitter returns to normal mode.