Det-Tronics EQP Fire and Gas Detection/Releasing System - Manual (Page 103)

14.1 95-8533 5-1
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-classified 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.
Note
electrochemical sensors have a finite lifespan. If
a successful calibration cannot be performed,
inspect the hydrophobic filter. If the filter is
plugged, replace it and recalibrate the sensor. If
the filter is in good condition, replace the sensor.
Recalibrate following the procedure described in
the “Calibration” section.