Vaisala HMP240 User Manual
Page 49
HMP240 series
M210300en
User's Guide
47
•
Insert the sensor head into the measurement hole of the
NaCl chamber.
•
Wait at least 20 minutes for the reading to stabilize.
•
If necessary, change the second point reading with arrow
keys and press ENT.
6.1.2.3
With LED 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!
•
Insert the sensor head into the measurement hole of the
LiCl chamber.
•
Wait at least 10 minutes for the reading to stabilize.
•
Connect an ammeter/voltmeter to the analogue outputs
(connector X2). Give command ¡¡¡l. At the first cali-
bration 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.
•
Insert the sensor head into the measurement hole of the
NaCl chamber.
•
Wait at least 20 minutes for the reading to stabilize.
•
Check that the reading corresponds within the desired ac-
curacy to the reading 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.
NOTE
If neither channel normally outputs the RH reading,
during the calibration channel 1 outputs the RH reading
0...100 RH%, corresponding to the current/voltage scale
selected.