49
7
Maintenance
7
Maintenance
As a result of extensive self-diagnosis, the measuring system is essentially maintenance-free.
Maintenance is restricted to the calibration and the cleaning of dust or other deposits; as well
as the cyclic replacement of the ZrO
2
measuring element.
7.1
Checking/Calibrating the KS1D Combination Probe
The checking / calibration should (advantageously installed) be built in at normal operating
temperature and carried out under operating conditions.
Recommended time spans (cycles):
•
6 hours after commissioning
•
12 months for natural gas
combustion
systems
7.1.1
Checking/Calibrating the Air Voltage (Offset)
1. Switch off the plant.
If you cannot switch off the plant, the probe must be dismantled. Observe the safety no-
tices!
2. Pre-ventilate, until there is no longer any flue gas at the measuring point (about 1 minute).
3. End the pre-purge.
4. Perform the offset calibration of the O
2
(U-O2) and CO/H
2
(U-CO) electrodes.
7.1.2
Checking/Calibrating the O
2
Electrode
See Chapter
7.1.3
Checking/Calibrating the CO/H
2
Electrode
See Chapter
