Det-Tronics R7495D UV/IR Flame Detection System - Manual (Page 25)

DEVICE REPAIR AND RETURN
Prior to returning devices or components, contact the
nearest local Detector Electronics office so that an RMI
(Return Material Identification) number can be
assigned. A written statement describing the malfunc-
tion must accompany the returned device or component
to expedite finding the cause of the failure, thereby
reducing the time and cost of the repair.
Return all equipment transportation prepaid to the facto-
ry in Minneapolis.
ENGINEERING SPECIFICATIONS
The UV/IR flame detection system shall have a micro-
processor-based controller that can operate 1 or 2
detectors and provide relay outputs. The controller
shall be field programmable for selecting time delay
length, sensitivity, voting output configuration, and
latching or non-latching operation. The system shall
operate on 24 vdc. The UV/IR flame detection system
shall be capable of responding to a 1 foot by 1 foot
gasoline fire at a distance of 50 feet. The detector shall
be capable of 1.0 second response time to an intense
fire signal. It shall not respond to radiation generated
by arc welding, x rays, or hot surfaces, but shall be
capable of responding to a fire in their presence. The
UV/IR flame detector shall be in a red, copper-free alu-
minum enclosure.
1 The detector shall be the Det-
Tronics model C7052J, no equal. The controller shall
be the Det-Tronics model R7495D Controller that fits in
the Det-Tronics model Q4004 Mounting Rack, which is
designed to fit standard 19 inch racks, no equal.
The UV/IR flame detector shall have one 3/4 inch NPT
2
entry for field wiring.
The controller shall have visual annunciation of fire and
fault conditions. The controller shall have two red LEDs
for individual detector alarm indications, one green LED
for power indication, one amber LED for fault indication,
two red LEDs for fire zone output indication, and one
red LED for alarm indication. The controller shall have
relay outputs through a plug-in backplate connector.
The signal processing shall require the UV radiation and
the flickering IR radiation to exceed field adjust thresh-
old levels and time delay before signalling an alarm
condition. The detector shall have an 80 degree cone
of vision and be of a modular plug-in design that allows
the UV and IR sensor modules to be easily field
replaced without the use of special tools. All optical
surfaces shall be easy to access for cleaning. No metal
rods shall be allowed in front of the sensor windows.
The UV/IR flame detector shall have optical testing
capabilities on both the UV and IR sensor. Films that
blind the UV sensor or the IR sensor shall cause a fail-
ure of the optical test.
The UV/IR flame detector shall be rated for an operating
temperature range of –40°F to +167°F (–40°C to +75°C)
and a storage temperature of –40°F to +185°F (–40°C to
+85°C). The detector shall operate over a humidity
range of 0 to 95% RH and be able to withstand 100%
condensing humidity for short periods of time. All print-
ed circuit boards shall be coated to provide protection
from environmental conditions. The UV/IR flame detec-
tor shall meet MIL-STD 810C for vibration and have a
swivel mounting bracket to provide a means to easily
mount and aim the detector.
The UV/IR flame detector shall be explosion-proof for
Class I, Division 1, Groups B, C and D; Class II,
Division 1, Groups E, F and G. The device shall be
rated NEMA 4 (dust-tight, watertight). The detector
shall be FM approved.
3
An explosion-proof UV/IR test lamp shall be provided to
allow field testing of the UV/IR flame detection system.
The test lamp shall be FM approved for use in Class I,
Division 1, Groups C and D hazardous areas. The
explosion-proof UV/IR test lamp shall be the Det-Tronics
model W867, no equal.
2 5 95-8331
Table 3—Troubleshooting Guide
Indication Status
FAULT LED on Mode switch in Test position, external reset
activated, or fault in controller circuitry.
FAULT LED oi fault - the oi ring and/or the window of the
and a detector indicated by the DETECTOR LED
DETECTOR is dirty, the detector tube module has lost
LED on sensitivity or is missing, or there is an open or
shorted wire between that detector and the
controller.
FAULT LED One or more detectors are responding to a
off and any radiation source that is not large enough to
DETECTOR LED reach the fire threshold programmed into
blinking slowly
the controller, or one or more detectors may
be overly sensitive.
POWER LED off No power to controller.