Important Information; Compulsory Calibration; Servicing The Analyzer; Half-Yearly Service - Bosch ETT 008.31 Repair Instructions

1.

Important information

Service and repair work on this piece of equipment may only be
performed by competent, that is, adequately instructed and
authorized persons.
A safety test as described in Section 11 must be performed
following all service and repair work with a possible influence on
safety functions.
When the device is to be used in countries where calibration is
compulsory by law, the legal regulations in force in the country of
use regarding operation, service and calibration must be obser-
ved.
The exhaust-gas analyzer carries dangerous con-
tact voltage. Poor service and repair work entails
a risk of accidents through electric shock.
Explosive gases may not be measured with this
exhaust-gas analyzer. The exhaust-gas analyzer
must not be used in potentially explosive at-
mospheres.
When working with toxic gases, care must be
taken to ensure that a concentration hazardous to
health cannot build up in the workplace. Unskilled
service and repair work entails a risk of intoxication
during operation with toxic gases.
The assembly contains electrostatic sensitive
devices.
Observe the regulations for ESD!
1.1

Compulsory calibration

National laws governing the calibration of exhaust-gas analyzers
must be observed.
Every six months
the exhaust-gas analyzer must be serviced by competent per-
sons.
If, during such work, an official seal is damaged, proper and
expert repair work must be effected and confirmed by the autho-
rized Service Agent or a new calibration performed.
For service work,
reports must be drawn up containing the following information:
- Time of service
- Type of service work
- Name of person or company carrying out service
These reports must be preserved for a duration of five years.
The operating instructions must be kept with the exhaust-gas
analyzer in such a way that they are available at all times.
The user of the exhaust-gas analyzer is re-
sponsible for observing calibration laws and
for regular servicing.
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2.

Servicing the analyzer

The service work described below must be carried out irrespec-
tive of the applicable laws in the country of operation.
2.1

Half-yearly service

i The only work to be performed at these intervals involves
checking and maintaining the device in working order.
! Before replacing filters, Sections 3.14 (Filtration) and 3.14.1
must be observed!
• Replace filter GF 1 (Figure 1, Pos. 1)
• Replace input filter GF 2 (Figure 1, Pos. 2)
• Replace paper filter (Figure 1, Pos. 4)
• Blow out fine filter (Figure 1, Pos. 5), replace if necessary
• Perform visual inspection of exhaust-sample probe. If seriously
clogged, blow out with compressed air against the intake
direction.
• Perform function test (Section 5)
• Check indicating accuracy (Section 6)
• Check zero point of oxygen measurement (Section 4.1.8)
• Perform leak test (Section 4.1.1)
2.2

Yearly service

This service work must be performed by a competent mainte-
nance agent. It comprises the tasks from the half-yearly service
plus the following points:
• Replace protective pump filter GF 3 (see gas-route diagram).
• Replace carbon canister in zero-gas duct (Figure 2, Pos. 31).
• Replace battery on motherboard/computer board
(Section 10.7).
• Replace O
measuring sensor (Section 10.6).
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• Fine-tune air-pressure gauge (Section 6.5).