10 pH indicator
30
✱
Press the
key (confirmation)
✱
Press the
key (return to the measurement mode).
Calibration
with / without
“frozen process
value output”
“Freezing” the process value output means that, during calibration, the output
signal is held at the value that was produced immediately before calibration
started. This is to avoid an uncontrolled reaction from any PLC that may be
connected to the output of the indicator/controller.
While the process value output is frozen, the lower display shows “donE” after
the last calibration step, and the upper display shows the latest measurement.
The process value output remains unchanged!
After the electrode has been installed once more, the
key must be pressed
again. The process value output is now coupled to the display again
.
Select
calibration
procedure
✱
Press the
key repeatedly, until “C211” appears in the lower display.
Use the
and
keys to set the configuration parameter:
✱
Press the
key (confirmation)
✱
Press the
key (return to the measurement mode).
10.4 1-point calibration
You will need
- a buffer solution with a pH value which roughly corresponds to the medium
measured later.
- a thermometer, if you want to use manual temperature compensation.
- a Pt100 or Pt1000 temperature probe, if you require automatic temperature
compensation.
Initial condition
A pH combination electrode connected to the 2-wire transmitter that is
attached to the dTRANS Az 01, as well as a Pt100 or Pt1000 temperature
probe (if required),
Chapter 10.1 “pH measurement circuit”, page 28ff.
Select calibration procedure,
Chapter 10.3 “Preparation”, page 29ff.
The operating level is unlocked,
“Unlocking the levels”, page 27, (code word 0110)
PGM
EXIT
The factory setting is: “Calibration without frozen process value
output”.
PGM
Calibration procedure
X
X
0
X
1-point calibration, process value output not frozen
0
1-point calibration, process value output frozen
1
2-point calibration, process value output not frozen
2
2-point calibration, process value output frozen
3
PGM
PGM
EXIT
