Vaisala HMP228 User Manual
Page 35
HMP228
M210282en-A
Operating Manual
29
•
If you want to see how the sensor stabilizes to the reference
temperature, enter c
T : 0.90 Ref1 ? c
T : 0.55 Ref1 ? c
T : 0.55 Ref1 ? 0.0
Press any key when ready...
•
Change the temperature and again check the transmitter against the
reference.
•
Check that the reading corresponds with the reading of the reference
instrument. If not, adjust the second point.
•
Press any key, enter the second point value and press
T : 20.0 Ref2 ? yy.y
•
The stabilization of the sensor can be monitored well by entering c
4.6.2.2
Using display/keypad commands
•
Leave the reference instrument and the transmitter for at least 4 hours
in the same space so that their temperatures have time to equalize.
Remove the filter cap prior to calibration.
•
Check the transmitter against the reference.
•
Select Cali in the main menu and then T cal; select two-point
calibration T 2 point cal. Change the first point reading with the
arrow keys and press ENT.
•
Change the temperature and again check the transmitter against the
reference.
•
Check that the reading corresponds with the reading of the reference
instrument. If not, adjust the second point.
•
If necessary, change the second point reading with the arrow keys and
press ENT.
4.6.2.3
Using LED commands
•
Leave the reference instrument and the transmitter for at least 4 hours
in the same space so that their temperatures have time to equalize.
Remove the filter cap prior to calibration.
•
Check the transmitter against the reference.
•
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 same reading with the reference and press ENT
switch.
•
Change the temperature and again check the transmitter against the
reference.