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MAINTENANCE
51
8.
MAINTENANCE
8.1
GENERAL
The FV300 series detectors contain no replaceable or adjustable components within the housing,
which should not be opened once installed and commissioned.
Routine maintenance is, therefore, limited to cleaning and testing the detectors.
8.1.1
ROUTINE INSPECTION
At regular intervals of not more than 3 months, detectors should be visually inspected to confirm
that no physical damage has occurred and that the alignment of the detectors has not been
disturbed. The detector windows should be checked to confirm that they are not blocked and that
no physical obstructions have been placed between the detector and the protected area. Check that
switch settings are correct.
In addition, at intervals of not more than 1 year, each detector should be checked for correct
operation. Any excessive deposits of dirt, oil etc. should be removed from the detector housing as
described in 8.1.2.
Note:
The inspection frequency specified above should be considered as a minimum
requirement to be applied in the average environment. The inspection frequency
should be increased for dirtier environments or those which present a higher risk
of physical damage.
For flameproof detectors, the following periodic checks should be made:
a) The dimensions of gaps at flameproof joints should be checked to see that they
do not exceed the maximum figure specified in BS EN 50018 : 2000.
b) Spigot joints should be separated and the faces examined for possible defects
resulting from corrosion, erosion or other causes.
c) Check that all stopping plugs and bolts are in position and tight.
d) No attempt should be made to replace or repair windows except by complete
assembly replacement.
8.1.2
DETECTOR CLEANING
The FV300 series detectors are relatively tolerant of accumulations of dirt on the sensor window
or optical monitoring reflector (see Fig. 22). However, thick deposits of dirt and oil will cause a
loss of sensitivity and a subsequent fault indication.
It is recommended that detectors be cleaned using water or a detergent solution. A stiff bristle (not
wire) brush may be used to remove heavy deposits. Particular attention should be paid to the
reflector and sapphire window (Fig. 22). The detectors must not be cleaned without first removing
power or isolating the detector.
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