Maintenance; Leak-Tightness Of Sampling System; Exhaust Gas Sampling Probe; Exhaust Gas Sampling Hose - Bosch BEA 060 Original Instructions Manual

en | 26 | BEA 060 |
5.4

Maintenance

5.4.1

Leak-tightness of sampling system

To ensure accurate exhaust emissions tests, it is
essential that there are no leaks in the sampling
system (exhaust gas sampling probe, hoses, coarse
filters). It is therefore advisable to conduct the leak
test daily.
5.4.2

Exhaust gas sampling probe

Keep the opening at the tip of the exhaust gas
sampling probe clean. In the event of HC residue and
condensate, detach the exhaust gas sampling probe
from the hose and blow compressed air through it in
the opposite direction to the intake flow.
5.4.3

Exhaust gas sampling hose

Check for damage. In the event of HC residue or
condensate, detach the hose from the measuring
device and blow compressed air through it in the
opposite direction to the intake flow.
5.4.4

Filters

i
When replacing the filters GF1, GF2 and GF3
always use original filters with the order no.
1 687 432 005.
If other filters are used (e.g. commercially available
fuel filters), the downstream measurement chambers
will be damaged by corrosion residue (e.g. rust
particles from metal filter elements) and inadequate
filter action.
!
Warranty and goodwill claims cannot be accepted
in the event of unit failure caused by the use of
incorrect filters.
The coarse filters remove particles and aerosols from
the measurement gas. Particles are solids such as
dust and soot. Aerosols are minute droplets of liquid.
These may be deposited in the gas path and the
measurement chambers and form coatings. Regularly
replace filters to prevent damage to the BEA 060.
Filter GF1
The coarse filter GF1 removes the coarsest particles
from the gas flow. It should therefore be replaced
most frequently. Replace the filter if severely
contaminated (fault message: poor flow) and also in
the event of HC residue. Depending on the rate of use
of the BEA 060, the filter should be replaced roughly
once a week.
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Filter GF2
The coarse filter GF2 removes further particles and
aerosols from the gas flow. The greater the degree
of contamination of this coarse filter, the smaller the
pore size and the better the filter action. The water in
the exhaust gas soon causes the filter to become wet.
This moisture washes the aerosols out of the gas flow
and makes for even better particulate filtration.
i
A wet coarse filter is therefore desirable!
Replace the filter if severely contaminated (fault
message: poor flow) and in the event of HC residue.
Depending on the rate of use of the BEA 060, the filter
should be replaced roughly once a month to once
a year.
Pump filter GF3
The coarse filter GF3 is designed to protect the
pumps. The coarse filter has to be replaced once a
year at most. Here, the filter action of a wet coarse
filter is also far superior to that of a dry coarse filter.
1
2
Fig. 4: Replacing the coarse filter
2
Robert Bosch GmbH