5-1
95-8533
18.2
Section 5
Maintenance
NOTE
Refer to the Eagle Quantum Premier
System Safety Manual (number
95-8599) for specific requirements
and recommendations applicable to
the proper installation, operation, and
maintenance of all SIL-Certified EQP
systems.
ROUTINE MAINTENANCE
To ensure reliable protection, it is important to
check and calibrate the system on a regularly
scheduled basis. The frequency of checks
is determined by the requirements of the
particular installation.
BATTERIES
Batteries must be replaced every 48 months,
or sooner if required by local codes.
IMPORTANT
Only sealed batteries are to be used.
MANUAL CHECK OF OUTPUT DEVICES
It is important that response devices be
checked initially when the system is installed,
as well as periodically during an on-going
maintenance program.
CAUTION
Be sure to secure all output devices that
are actuated by the system to prevent
unwanted activation of equipment, and
remember to place these output devices
back into service when the checkout is
complete.
O-RING MAINTENANCE
WARNING
The hazardous area must be
de-classied prior to removing a junction
box cover with power applied.
A rubber O-ring is used to ensure that the
junction box cover will seal tightly and provide
protection against water entry. The enclosure
should be opened periodically, and the O-ring
inspected for breaks, cracks and dryness.
To test O-ring: remove it from the enclosure and
stretch it slightly. If cracks are visible, replace
it. If it feels dry, a thin coating of lubricant
should be applied. When re-installing the
O-ring, be sure that it is properly seated in the
housing groove. It is imperative that this O-ring
be properly installed and in good condition.
Failure to properly maintain it can allow water
to enter the enclosure and cause premature
failure. A coating of lubricant should also be
applied to the threads on the cover before
re-assembling the enclosure. This will both
lubricate the cover threads and help prevent
moisture from entering the enclosure.
CAUTION
The O-rings should be lubricated with
a silicone free grease. The use of
other lubricants is not recommended,
since they can adversely affect the
performance of some sensors. Under
no circumstances should a lubricant
or compound containing silicone be
used on systems using catalytic type
combustible gas sensors.
GAS SENSOR MAINTENANCE
All gas sensors must be calibrated on a
regular basis. Calibration should typically be
performed every 90 days for catalytic and
electrochemical sensors.
Catalytic sensors have a finite lifespan. If a
successful calibration cannot be performed,
replace the sensor and recalibrate following
the procedure described in the “Calibration”
section below. Always compare part numbers
to be sure that the correct replacement
sensor is being used.
CAUTION
Exposure of the sensor to high
concentrations of combustible gases
for extended periods of time can
introduce stress to the sensing element
and seriously affect its performance.
After exposure, recalibration should
immediately be performed, and the
sensor should be replaced if necessary.
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