Vaisala Calibration of Series HMDW2030 and HMP130 Transmitter with HMI41 - Manual (Page 7)

HMI41 Calibration Option
19165ZZ-U220en-1.1 Operating Manual
1996-08-29 3
2. CALIBRATION
For a successful calibration, it is essential that the probe of the HMI41 and
that of the transmitter are at the same temperature, and that the reference
probe has been previously calibrated. Always allow enough time for the
readings to stabilize. Note that the stabilization time depends on the ambient
conditions and may vary from 10 minutes to a couple of hours.
2.1 Getting started
After having selected the desired function (Chapter 1.2), turn the HMI41 off
and connect the calibration cable to the EXT connector at the bottom of the
HMI41 (Figure 2.1). Connect the other end of the cable to the appropriate
connector in the transmitter (Figures 2.2 - 2.4).
EN TER MO DE HOLD ON/OFF
EXT
C o n n e c t o r f o r t h e
c a l i b r a t i o n c a b l e
Figure 2.1 Location of the HMI41 calibration connector
one point
RH calibration
test connector
Figure 2.2 Calibration connector and potentiometer in
the HMP130 series transmitters