Service and maintenance
Installation & Commissioning Handbook, ,
P-ASENSE75/IE 980302, 7483 Trondheim
Page 22
6. Service and maintenance
6.1 Annual service
The service check-list below provides check-points for an annual
inspection and service of the system.
NB!
In seriously polluted environments it may be necessary to inspect
and service the system more frequently.
Before carrying out a service you should inform the person in
charge and, if necessary, disconnect the control outputs.
6.2 Service check-list
Task
Remarks
Tick
here
1
Change the filter in the detector.
See next chapter.
2
Check that the pipes are intact and free from any
obvious defects such as a break.
3
Check that the sampling holes are clear. Clean out if
necessary.
4
Implement an alarm test, and check that the time it
takes for the alarm to activate is more or less the
same as when the system was commissioned.
5
Introduce smoke/environment-friendly test gas in the
end of the pipe and check that the smoke transport
time approximates the transport time during the
commissioning of the system.
A slower transport time could indicate a
blockage or dust, etc. in the pipes. If the
transport time is excessive, it may be
necessary to clean out the pipe system.
6
If necessary, clean out the pipe system.
The system can be cleaned by drawing a
soft rag through the pipes with the help of
a wire, or by removing the end plug and
using an air-pressure hose in the opposite
direction to the normal air flow.
7
Ensure that the pipe system is intact after cleaning.
8
If a fire simulation test was implemented when the
system was commissioned, carry out a random test at
one of the same test sites.
9
Compare the response time with that noted during
commissioning.
10
When the service is complete, set the system to
normal running and inform the person in charge.
