The ambient pressure will affect the calibration gas and has to be taken into account. The Gas
Detector is calibrated for an average ambient having a pressure of 100 kPa (0.987 atm). The ambient
pressure can vary a few percentages depending on the weather conditions and will influence the
pressure of the gas leaving the gas cylinder. 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.
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.
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.
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