D-9107RExd
Digital Flame Proof Dual IR Flame Detector
Installation and Operation Manual
Page 8
9 Maintenance
1
The detection window should be cleaned at least every three months.
2
Before cleaning, notify relative departments that the system is undergoing
maintenance and will be out of service. Disable the zone or system in maintenance
to avoid unwanted alarms.
3
After cleaning, install the detector back and test again.
10 Caution
(1) The detector should be handled with care during maintenance to avoid damage.
(2) Installation and maintenance should strictly comply with relative codes for
explosive and hazardous areas.
(3) Never open the cover for maintenance in field.
(4) The enclosure must be earthed.
(5) False alarms may occur if there is arc welding operation within 5 meters to the
detector.
(6) The following places are not suitable for the detector:
Where flameless fires are to be expected.
Where intensive smoke spreads before flames.
Where the "view" of the detector is easy to be obscured.
Where the sun can directly shine the detection window.
Where the detector may encounter frequent vibration.
(7) Special conditions for safe use:Repairs of the flameproof joints must be made in
compliance with the structural specifications provided by the manufacturer. Repairs
must not be made on the basis of values specified in tables 1 and 2 of IEC 60079-1.
(8) The screws used for the assembly must be of yield stress higher or equal to
700N/mm
2
.
(9) The threaded entries comply with following parameters:
Threaded entries type: M27
×
2
Position on the equipment: see Fig 9
The number permitted: one is installed in back cover, and two at most
Sealing and washer size: Sealing and washer size:
11mm(internal diameter)
×
21mm(external diameter)
×
22mm(thickness)
Cable external diameter
8mm
～
10mm is recommended.
The torque for cable nut is 25 N.m to compress sealing ring.
(10) One blanking element of threaded entries type M27
×
2 is delivered with the
detector and installed in back cover.
11 Accessories
1 installation and operation manual
4 M6×60 expansion bolts
1 M5×10 screws
1 adjustment frame
1 Allen Key
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