OPERATING MANUAL_______________________________________________________________
56_____________________________________________________________________M210492EN-A
When LED commands are used and when the two analogue channels
do not output either relative humidity and/or temperature, relative
humidity is calibrated on channel 1 and temperature is calibrated on
channel 2. The calibration ranges are 0...100 %RH and -20...+80 °C.
When the transmitter is calibrated at two points, the points must be
either 50 %RH or 50 C apart from each other.
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 and adjustment adjustment
procedure
A two-point humidity calibrationand adjustment 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 30 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>
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