WIKA CTH6300 Betriebsanleitung Seite 28

6. Commissioning, operation
Example of the measured value display after physical calibration against a test
variable:
The small 2 in the left corner in connection with the display segment CAL in the center
GB
of the display indicates that the physical probe calibration oP2 has been activated.
6.4.4.1 Calibration function combined probe (humidity/temperature) CAL
All humidity probes by WIKA are combined probes.
This means that besides the humidity sensor they also contain a temperature sensor.
Both measurement parameters are connected to the same measuring channel using
the same probe connector. To calibrate both measurement parameters humidity and
temperature, the measurement parameter rH must be set first (rel. humidity) (see
chapter 6.4.2 "Probe selection Prob").
The instrument has 3 different calibration modes:
OFF Standard characteristic curve
no probe-specific correction is performed
oP1 Calibration by code
The 2 x 4-digit code is displayed clearly visible on the handles of our probes,
rH = humidity and P °C = temperature) corresponds to a 2-point calibration.
oP2 Physical calibration
Physical calibration
Calibration with test variables: 1-point, 2-point or 3-point calibration possible -
is only possibly for the measurement parameter rH humidity.
CAL = calibrate
Press the ENTER/MENU key and select CAL using the arrow keys ▲▼. Then press
ENTER/MENU again. A small 1 appears on the left side of the display, it indicates the
channel. Use the arrow keys ▲▼ to select the channel (1 or 2) to be calibrated. Confirm
selection by pressing ENTER/MENU.
28 WIKA operating instructions, models CTH6300 and CTH6500