9 | Maintenance
90
D-LX 201/721
NOTICE
Damage to electronic components due to electrostatic discharge (ESD)
Electronic components are becoming smaller and smaller and more and more
complex. Their susceptibility to damage from electrostatic discharge is increased
accordingly. Therefore:
▶ To protect the components, measures must be undertaken to prevent electrostatic
discharge during all work performed at the open device (ESD protection).
▶ To prevent static charges building up on the human body, service employees can
for example be equipped with a personal earthing system.
NOTICE
The system may be damaged and contaminated due to the failure of the purge
air!
If the purge air fails, the lens may quickly become contaminated and the flame monitor
may overheat due to a build-up of heat and be destroyed. Therefore:
Make sure that
▶ the purge air supply is operating reliably and smoothly (even when the system is
stopped).
▶ you immediately detect a failure of the purge air.
▶ the flame monitor is protected by a valve or dismantling process in the event of a
purge air failure.
9.2 Customer service information
Maintenance work can be carried out by DURAG on request. We will gladly explain
how a maintenance agreement could benefit your company. The commissioning of the
flame monitor can also be performed by DURAG. The on-site electrical installation
must be performed by qualified electricians and must comply with the local regula-
tions. You can find our service addresses and telephone numbers in the Appendix on
page 147.
9.3 Maintenance intervals
The flame monitor is a low-maintenance device with system-dependent maintenance
intervals must be specified by the operating company. The maintenance intervals de-
pend on:
● Dust in the combustion air
● The type of fuel
● The volume of purge air
● The general ambient circumstances (e.g. climatic conditions at the measuring
point)
It makes sense to start with a short maintenance interval (typically 4 weeks), and to
then gradually increase it to up to 6 months based on the particular conditions.
If the flame monitor is not sufficiently maintained, or is not maintained at all, then a
burner failure can be expected with increasing contamination of the lens.
Comprehensive functional testing of the flame monitor can be performed using the test
kit (see section 5.2 Accessories [}31]). This may need to be performed at regular inter-
vals as part of functional safety (see 4 Functional safety [}27]).
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