14 Redox indicator
42
14.4 2-point calibration
You will need
- A vessel with a sample of the medium to be decontaminated.
- A vessel with clean water.
- A vessel with a sample of the decontaminated medium.
Initial condition
A metal combination electrode, or a metal electrode and a reference electrode
are connected to the redox transmitter,
Chapter 14.1 “Redox measurement circuit”, page 39.
The calibration procedure has been selected,
Chapter 14.2 “Calibration”, page 39.
The operating level is unlocked,
Chapter 9.5 “Programming”, page 27, (code word 0110)
The instrument is in the measurement mode,
Chapter 9.2 “Principle of operation”, page 24.
Calibration
✱
Press the
+
(Cal) keys
✱
Immerse the redox electrode in the vessel containing a sample of the
medium to be decontaminated.
✱
The lower display shows “Cal1”, with the decimal point flashing.
✱
When the % value display has stabilized, set the displayed value to e.g.
20% using the
or
keys.
✱
Press the
key.
The lower display shows “Cal2”, with the decimal point flashing.
✱
Remove the redox electrode from the sample of the medium to be
decontaminated and rinse with water.
✱
Immerse the redox electrode in the vessel containing a sample of the
decontaminated medium.
✱
When the % value display has stabilized, set the displayed value to e.g.
80% using the
or
keys.
✱
Press the
key.
The instrument stores the new zero and the new slope.
The instrument is in the measurement mode.
The samples must be checked in accordance with the legal
requirements!
If, on completion of calibration, the instrument shows “Err” in the
temperature display,
Chapter 34.1 “Messages”, page 101.
PGM
PGM
PGM
