Tronics – Det-Tronics C7051B, C UV Flame Detector User Manual

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SYSTEM APPLICATION

The R7404 Controller is a significant advance in the Det-
Tronics line of ultraviolet (UV) fire detection equipment,
and broadens the range of capabilities available for fire
protection systems. Incorporating microprocessor-
based circuitry, the R7404 increases operational flexibil-
ity and at the same time retains important features devel-
oped through successive design innovations in several
generations of Det-Tronics equipment. These include
the Automatic Optical Integrity (

oi) feature, which pro-

vides a continuous check of the optical surfaces, detec-
tor sensitivity and electronic circuitry of the detector/con-
troller system. Also included is automatic fault identifi-
cation, which monitors optical integrity, detector supply
voltage, controller operation mode and incoming “fire”
signals, and provides a digital display of system status in
numerical code. Other features retained from previous
generations of Det-Tronics equipment include individual
zone identification and “voting” capability, as well as
manual

oi testing.

The operational flexibility of the R7404 has led to the
development of the Det-Tronics nuclear surveillance
(count subtraction) fire detection system, which automat-
ically compensates for x-rays or gamma radiation that
might otherwise cause false actuation of the system. The
detector consists of a UV detector module mounted next
to a similar detector module that is blinded to UV. The
sensor tubes within the detector module pair are elec-
tronically matched for identical response to external radi-
ation. The blinded detector module can only respond to
x-rays and gamma radiation, while the fire detector mod-
ule can respond to UV as well as x-rays and gamma radi-
ation. The controller subtracts the blinded detector’s sig-
nal from the fire detector’s signal. The remainder repre-
sents only the UV radiation, if present.

The C7051 Detector is sensitive to the UV radiation that
is emitted by a flame, and is designed for hazardous
locations. It is particularly suitable for use in outdoor
applications because it is not affected by wind or rain
and is insensitive to solar radiation. In addition, the
detector does not respond to normal artificial light.

Typical applications for Det-Tronics UV detection sys-
tems are:

— Wherever highly combustible materials are involved
— Where there is a need for fast response (0.5 second)

to flame

— Where there is a large capital investment to be pro-

tected.

Examples of actual installations using the Det-Tronics UV
detector in automated fire protection systems include:

7/01

95-8256-02

INSTRUCTIONS

Ultraviolet Fire Detection System

with Nuclear Surveillance

R7404 Controller

C7051 Detector

DET

TRONICS

*oi is Detector Electronics' Trademark for its patented Optical

Integrity Systems. U.S. Patent 3,952,196, United Kingdom Patent
1,534,969, Canada Patent 1,059,598.