Vaisala Calibration of Series HMDW2030 and HMP130 Transmitter with HMI41 - Manual (Page 9)

HMI41 Calibration Option
19165ZZ-U220en-1.1 Operating Manual
1996-08-29 5
•
After having completed the calibration, press ON/OFF and disconnect
the cable.
If you prefer, you can change the HMI41 display to show the difference in the
readings and then adjust the transmitter. To do this, press MODE when both
readings are on the display and a text similar to the following is displayed:
RH %
Numbers on the first line indicate how much the RH measured by transmitter
differs from that of the reference probe. Numbers on the second line indicate
the RH measured by the reference probe. If you wish, you can now calibrate
the transmitter (by pressing MODE again the measured values appear on the
display):
•
Wait until the readings have stabilized and adjust the calibration
potentiometers (Figures 2.2 - 2.4) until the numbers on the first line
are as close to zero as possible. It is recommended to use the offset
potentiometer if the RH is <65 %RH and the gain potentiometer if the
RH is >65 %RH.
•
After having completed the calibration, press ON/OFF and disconnect
the cable.
GUARANTEE
Vaisala issues a guarantee for the material and workmanship of this product
under normal operating conditions for one (1) year from the date of delivery.
Exceptional operating conditions, damage due to careless handling and mis-
application will void the guarantee.