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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.
See Chapter 6.4.1 Offset Calibration.
7.1.2 Checking/Calibrating the O
2
Electrode
See Chapter 6.4.2 Calibrating the O
2
Electrode.
7.1.3 Checking/Calibrating the CO/H
2
Electrode
See Chapter 6.4.3 Perform a Calibration of the CO/H
2
Electrode.
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