
Chapter 5 ___________________________________________________ Calibration and Adjustment
VAISALA_______________________________________________________________________ 111
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Now proceed to the adjustment at the wet end reference
condition (30 ... 75 %RH) and carry out the procedure as
described in the previous items.
7. Answer YES to confirm the adjustment. Press OK to return to
the adjustment menu.
8. Before closing the adjustment mode, feed the adjustment
information into the device, see section Adjustment Information
on page 109. Press EXIT to close the adjustment mode and
return to the basic display.
Using Serial Line
NOTE
Reference humidities must be ~0 %RH and 30 ... 75 %RH. A suitable
product for the two point RH calibration is for example the Vaisala
Humidity Calibrator HMK15.
1. Connect the DMT345/346 to a PC. See section Serial Line
Communication on page 60. Open a terminal program.
2. Carry out the chemical purge.
3. Press the ADJ button.
4. Remove the filter from the probe and insert the probe head in
the dry end reference conditions (~0 %RH).
5. Issue the FCRH command and press Enter.
FCRH
6. Wait at least 30 minutes for the sensor to stabilize.
7. 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.
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