Vaisala DMP248 Manual de servicio Pagina 62

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OPERATING MANUAL_______________________________________________________________
56 _____________________________________________________________________ U263EN-1.4
NOTE
As relative humidity is a temperature dependent parameter, the probe
and the salt bath calibrator have to stabilize to the same temperature
for best accuracy.
Two-point calibration procedure
A two-point humidity calibration should be performed in stable
conditions using saturated salt solutions as references.
Using serial commands
Leave the calibrator and the transmitter for at least 4 hours in the
same space so that their temperatures have time to equalize.
Remove the filter cap on the transmitter.
Disconnect the security lock jumper
before turning the transmitter on!
Place the sensor head in the calibration hole of the LiCl bottle (dry
end reference) in the humidity calibrator.
Wait for 10 minutes.
Give command CRH <cr>, enter the first point value and press
<cr>.
>CRH <cr>
RH : xx.x Ref1 ? yy.y <cr>
Press any key when ready...
If you want to see how the sensor stabilizes to the humidity in the
calibrator, enter c <cr> instead of the first reference:
RH : 11.9 Ref1 ? c <cr>
RH : 11.5 Ref1 ? c <cr>
RH : 11.5 Ref1 ? 11.3 <cr>
Press any key when ready...
Place the sensor head in the calibration hole of the NaCl bottle
(wet end reference) in the humidity calibrator.
Wait for 10 minutes.
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