Chapter 5 ______________________________________________________________ Maintenance
VAISALA _______________________________________________________________________ 59
5. Use
the
ERRS
command to see that no errors are active:
>errs
6. Use
the
PASS
command to enable the advanced commands:
>pass 1300
7.
Turn both trimmers to zero using the Phillips head screwdriver, and
use the
ZERO
command to set their correction to exactly zero:
>zero
8.
Insert the probe in the LiCl salt chamber of the humidity calibrator
(11 %RH), and wait for 20 – 40 minutes for the reading to stabilize.
9. Give
the
CRH
command. The output from the command shows the
currently measured RH value, and prompts you to enter the value
of the reference 1. This is the reference on the dry end, which
produces the offset correction for the measurement.
>crh
RH: 10.97112003 Ref1 ?
10. You now have three choices:
- To apply the correction, type 11 and press ENTER (assuming
you are using the HMK15 and the LiCl salt).
- To exit the
CRH
command without adjusting the measurement,
press the ESC key and exit this procedure.
- To refresh the measured value without typing in the correction,
press ENTER.
11. If you only want to perform a one-point calibration (offset
correction), press the ESC key after entering the correction. The
CRH
command will exit, and you can move to step 14.
RH: 11.0800360 Ref1 ? 11
Press any key when ready
>
To continue with the calibration of the wet end (gain correction),
press ENTER.
12. Insert the probe in the NaCl salt chamber (75 %RH) and wait for
20 – 40 minutes for the reading to stabilize.
13. Type 75 and press ENTER to apply the correction (assumes you are
using the HMK15 and the NaCl salt).
RH: 75.00134550 Ref2 ? 75
OK
>
The
CRH
command is now finished and both adjustments have
been applied.
Содержание HUMICAP HMM100
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