7 Service and Maintenance
73
7.3.3 Cleaning the sintered metal preliminary filter
Cleaning the filter is only necessary if permeability is impaired.
In this case, one of the two following error messages is displayed:
“Delta-P offset calibration too high, dirty filter”
“Delta-P offset calibration insufficient, not enough gas”
This fault is also noticeable in the sluggish response of the probe to changes in
measurement values during offset calibration, and in a sharper rise in pressure
(absolute pressure) during calibration.
To clean the filter, you will need the CO/H
2
measuring cell repair kit
Type 656 R 2060...2062.
To replace the CO/H
2
measuring cell, dismantle the probe as follows:
Detach the baffle plate
To do so, slacken the two Allen screws
Carefully pull the baffle plate to the front and off, as the preliminary filter is inserted in
the plate. If you cannot loosen the two Allen screws, cut off the heads and knock the
pins out. The repair kit contains new screws and anti-seize paste.
Clean the sintered metal preliminary filter:
Brush and blow out.
On installation, ensure that the baffle plate is oriented so that it is against the flow of
exhaust gas.
7.3.4 Replacing the CO/H
2
measuring cell
To do this, you will need the CO/H
2
measuring cell repair kit Type 656 R 2060…2062
• Disconnect the gas lines and electric cables of the KS1-DK combination
probe and remove it
• Replace the CO/H
2
measuring cell. To do so, detach the probe as follows
1. Disconnect the probe (terminals 12/33/34/35/36)
2. Remove the baffle plate (section 7.3.3)
3. Remove the probe head by slackening all six Allen screws
If you cannot loosen the Allen screws, cut off the heads and knock the pins out.
The repair kit contains new screws and anti-seize paste.
4. Pull the probe head and probe to the front and out
5. Unscrew the probe from the probe head
6. Remove the metal O-ring and discard it, the repair kit contains new metal O-
rings.
7. Install in reverse order
Don’t forget anti-seize paste!
Ensure that the baffle plate is against the flow!
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