User's Guide _______________________________________________________________________
138 __________________________________________________________________ M210243en-A
Air Temperature and Relative
Humidity Sensor
Calibration and maintenance of the air temperature and relative
humidity probe should be performed at regular intervals, depending on
the conditions of use and desired accuracy. The validity of the
readings should be checked annually.
The QMH101 probes are easy to maintain and calibrate. The probe
consists of a probe head and a handle with cable. All calibration
electronics are in the probe head, which can be disconnected from the
handle without disconnecting the wires, as shown in Figure 116
below. If you wish to continue the measurement immediately, you can
insert a calibrated probe head in place of the disconnected one; this
way, the measurement is interrupted for less than a minute.
0201-047
Figure 116
QMH101 Probe Maintenance
The following numbers refer to Figure 116 above.
1
=
Adjustment trimmers: W=wet, D=dry, (T=temperature; for
factory use only)
2
=
O-ring for sealing the probe weather tight
Humidity Calibration
For a high-accuracy two-point calibration, use a Vaisala HMK15 or
HMK13B calibrator and saturated salt solutions. See respective
manuals for details.
