9. Give the crh command to start the calibration and adjustment sequence. The transmitter
shows the measured RH value and prompts you to enter the real humidity of the first
reference point.
crh
RH : 11.5378 1. ref ?
10. Press Enter to refresh the measured value (to see if the measurement is now stable).
When it is, enter the value of the first reference point and press Enter.
RH : 11.5378 1. ref ? <cr>
RH : 11.5379 1. ref ? <cr>
RH : 11.5379 1. ref ? 11.3
Press any key when ready ...
To exit the procedure without adjusting the measurement, press the Esc key
on your keyboard.
11. Transfer the probe to the NaCl (75 %RH) salt jar. Plug the hole on the LiCl (11 %RH) jar.
12. Wait for the humidity to stabilize. Press Enter on the keyboard to refresh the measured
value:
Press any key when ready ...
RH : 74.6984 2. ref ? <cr>
RH : 74.7173 2. ref ? <cr>
13. When the measurement is stable, enter the value of the second reference point and press
Enter.
RH : 74.9684 2. ref ? 75.4
OK
14. If the adjustment is successful, the transmitter responds with the text OK, and stores the
adjustment.
If the reference points do not fulfill the requirements, or the measurement is too unstable
for adjustment, the adjustment sequence will exit with an error message. In such a case,
the adjustment is not stored.
Chapter 7 – Maintenance
61
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