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3.1.9 Corrected CO concentration (CO
The exhaust-gas analyzer module calculates the true CO concen-
tration (CO
) from the concentrations of CO and CO
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process also takes , for example, factors such as leaks in the
exhaust system into consideration.
This function can be deactivated (Section 4.5, Write parameters
menu).
3.1.10 Parameterization
The exhaust-gas analyzer module can be parameterized for its
specific intended tasks in the Set parameters menu (Section 4.5).
Additional possibilities for parameterization are contained in the
Adjustment functions menu (Section 9). However, these - like
the adjustment functions themselves - can only be accessed if a
test seal has been broken.
3.1.11 Filtration
Particles and aerosols are removed from the test gas by a
cascade of filters.
Particles constitute solid bodies such as dust and soot, while
aerosols are tiny droplets of fluid which condense in the gas duct
and analysis chambers. There they form a coating which may give
rise to error messages.
For this reason, it is imperative to ensure the correct manner of
filtration.
3.1.12 Principle of filtration
The first filter, GF1, filters the majority of particles and aerosols out
of the gas flow. This filter clogs most rapidly and must therefore
be replaced most frequently: about once a week.
The inlet filter, GF2, at second place in the cascade, filters out a
further part of particles and aerosols. The more clogged the filter
is, the smaller the mesh size and thus the better the filtering action.
The filter becomes wet very quickly from water in the exhaust gas.
This moisture washes the aerosols out of the flow of gas and filters
the particles better. A wet filter is therefore desirable!
This filter should be replaced from around once a month to once
a year.
Filters GF3 and GF4 have the task of protecting the internal
pumps. When the filtration system as a whole is being used
correctly, these filters must only be replaced once a year, at the
most.
Filter GF4, in particular, also has a better filtering action when wet
than dry.
)
3.2
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The service work listed below must be performed irrespective of
. This
legal requirements in the country of operation.
2
3.2.1 Half-yearly service
i At this interval, only work for testing and maintaining opera-
1.
2.
3.
4.
5.
6.
3.2.2 Yearly service
This service work must be performed by expert maintenance
personnel. It consists of the work included in the half-yearly
service plus the additional items:
! It is essential to read Sections 3.1.11 (Filtration) and 3.1.12
1.
i The pump protection filter GF4 is situated in the interior of the
! When the GF4 filter is replaced annually, the internal piping
Servicing the unit
tional readiness must be performed.
Replace GF1 filter (Item 1)
Replace inlet filter GF2 (Item 2)
Check that both PVC hoses are connected to the gas outlet
(Items 3, 4)
Visual inspection of exhaust-sample probe (Item 6)
In the case of major contamination, blow out with com-
pressed air against the direction of suction
Perform leak test (Sec. 4.2)
Update service date (Sec. 4.7.8)
459715/8Ha
3
6
before replacing the filters!
Replace pump protection filters GF 3 and GF4.
unit.
should also always be replaced. Use the parts set 1 687 010
125 for this purpose. Be very careful to consult the gas flow
plan in chapter 12.5.
459715/9Ha
4
2
1
GF4
AF1
GF3
9
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