3 calibration procedure after sensor change, 1 using serial commands – Vaisala HMP260 User Manual
Page 48
HMP260 SERIES
Operating Manual
HMP260-U017en-1.5
42
1997-11-25
•
Wait for 10 minutes.
•
Connect an ammeter/voltmeter to the analogue outputs (connector
X2). Give command
¡¡¡l. At the first calibration point the LED
on the left flashes; adjust the first point (offset) with the arrow
switches to the value given in the calibration table (Chapter 6.1.4) and
press ENT switch.
•
Place the sensor head into the calibration hole of the NaCl bottle in
the humidity calibrator.
•
Wait for 10 minutes.
•
Check that the reading corresponds within the desired accuracy to the
reading given in the calibration table (Chapter 6.1.4). If not, adjust the
second point with the arrow switches to the correct value and press
ENT. At the second calibration point the second LED from the left
flashes.
6.1.3
Calibration procedure after sensor change
Humidity calibration should be performed in stable conditions using saturated
salt solutions as a reference.
6.1.3.1
Using serial commands
Disconnect the security lock jumper!
•
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.
•
Place the sensor head into the calibration hole of the LiCl bottle in the
humidity calibrator.
•
Wait for 10 minutes.
•
Give command FCRH <cr> and enter the first point value and press
<cr>:
FCRH <cr>
RH : xx.x Ref1 ? yy.y <cr>
Press any key when ready...
•
The stabilization of the sensor to the reference humidity can be
monitored by giving c <cr>:
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 into the calibration hole of the NaCl bottle in
the humidity calibrator.
•
Wait for 10 minutes.