A 1% change in ambient pressure from 100 kPa, will result in a 1 % change in gas
reading and should be accounted for.
6 Maintenance
Very little Maintenance is required for PG11. The detector does not have any internal
functions that require regular monitoring or maintenance. Regular maintenance consists only
of cleaning the optics and inspecting the detector exterior for damage. Any damage to the
internal of the detector is handled by the detector Self Diagnosis described in a separate
chapter.
Please note that maintenance of the optics where parts of the optics may be physically
blocked, may lead to false alarms or warnings. This is also valid when you insert or
remove the Environment Shield.
Always inform operations before doing any maintenance on safety critical equipment.
6.1 Cleaning of optics - lens and mirror
If installed, remove the Environment Shield. Then clean the lens and mirror with a soft, clean
tissue. Both these optical parts are made of sapphire and as such are resistant to scratching.
Avoid cleaning with liquids containing hydrocarbons such as acetone. After such cleaning,
make sure the solution has dried fully and residues have been wiped away before any
functional testing is performed.
6.2 Inspecting detector for damage
Following should be checked:
● Blocked sensor section
● Any bag around the detector will prevent detection of gas.
○ Recommend using the DETECTOR BLOCKING KIT during work around the
detector such as paint work and sandblasting that might pollute and damage
the optics.
● Rusted flame joints
● Terminal compartment
○ O-ring shall be in place and without damage.
○ Shall be free from dirt and water.
■ Do not add any drying bags or such inside the terminal compartment
since this can lead to short circuiting electrical wiring. The O-ring shall be
sufficient to keep the terminal compartment dry and free of dust.
Document 022-80036-OM Revision R03 Page 29 of 48
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