Maintenance; Hermetic Sealing Of The Sampling System; Sampling Sensor; Coarse Filter Gf1 - Bosch ETT 8.70 Instrucciones De Manejo

E r r 19 Clock faulty
Remedy:
Contact the Bosch service agent quoting the code number.
E r r 20 Battery exhausted
Remedy:
Contact the Bosch service agent quoting the code number.
E r r 21 Channel allocation wrong
Remedy:
Contact the Bosch service agent quoting the code number.
E r r 22 Power supply voltage exceeds tolerances
Remedy:
- Check voltage of power supply
If this does not rectify the fault, contact the Bosch service agent
quoting the code number.
E r r 23 Temperature measurement of the analyser faulty
Remedy:
Contact the Bosch service agent quoting the code number.
E r r 24 EEPROM fault
Remedy:
Contact the Bosch service agent quoting the code number.
E r r 25 EEPROM fault
Remedy:
Contact the Bosch service agent quoting the code number.
E r r 26 HC channel not calibrated
Remedy:
Contact the Bosch service agent quoting the code number.
E r r 27 CO channel not calibrated
Remedy:
Contact the Bosch service agent quoting the code number.
E r r 28 CO channel not calibrated
2
Remedy:
Contact the Bosch service agent quoting the code number.
E r r 29 Temperature compensation not carried out
Remedy:
Contact the Bosch service agent quoting the code number.
E r r 30 HC, CO and CO
tolerances
Remedy:
- Start system test.
If this does not rectify the fault, contact the Bosch service agent
quoting the code number.
signal equalisation exceeds
2
7.

Maintenance

Routine maintenance will ensure that the unit is ready for
operation.
The following periods must be observed, unless the regulatory
authority specifies otherwise.
Every six months
- Replace the coarse filter GF1 (7) in sampling hose.
- Replace the intake filter GF2 (4) (see Section 7.5).
- Check whether all three PVC hoses are connected to the gas
outlets (10/11/121)
- Visual inspection of the sampling sensor (9)
- Leak test in accordance with section 5.2
Annual maintenance
This maintenance must be carried out by a qualified service
agency. It comprises six-monthly maintenance and the following
additional points:
- Checking the measurement accuracy of the analyser with a
test gas
- Replacing the activated charcoal filter (2) in the zero gas path
- Replacing the protective pump filters GF3 (3) and GF4 (1).
The calibration requirements of the responsible (local) authority
must be observed.
7.1

Hermetic sealing of the sampling system

A hermetically sealed sampling system is an absolute necessity
for accurate exhaust analysis. Testing it for leaks every day is
recommended (see section 5.2).
7.2

Sampling sensor

Keep the aperture at the tip of the sensor clean. If any condensa-
tion or HC residue is present, remove the sampling sensor from
the hose and blow it out with compressed air against the
direction of intake.
7.3

Coarse filter GF1

If very dirty (fault message for no flow), replace the coarse filter.
The same applies if HC residue is present.
7.4

Sampling hose

Check for damage. If any HC residue or condensation is
present, pull the hose off the analyser and blow it out with
compressed air against the direction of intake.
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