Det-Tronics C7051B, C UV Flame Detector - Manual (Page 12)

INPUT VOLTAGE—
The R7404 is designed to operate from any voltage in the
range of 10 to 38 volts dc. For ac line (mains) voltage
operation, an optional voltage converter (model W4220)
is available from Det-Tronics.
TEMPERATURE RATING—
Operating: Detector: -40°F to +167°F
(-40°C to +75°C).
Controller: -40°F to +158°F
(-40°C to +70°C).
Storage: -67°F to +170°F (-55°C to +77°C) for the
system.
R7404 OUTPUT CIRCUIT RATINGS—
Open collector solid state output is rated 100 mil-
liamperes dc and is transient protected by an “inherent”
zener diode. Lead monitoring is provided by an internal
100 kilohm resistor from output to ground. The output
transistors are rated at 60 vdc. External equipment that
may generate transients when switching (such as relays)
should have a transient suppression device connected
across the coil at the time of installation. This will safe-
guard the output transistors in the R7404.
POWER CONSUMPTION—
Standby condition: 1.5 watts typical, 1.7 watts maximum.
Fire condition (all detectors responding): 15 watts typi-
cal, 16.5 watts maximum.
WIRING REQUIREMENT—
A shielded wire is required for the B-lead from each zone
to the controller, 22 gauge, 300 volt rms rating minimum.
Each detector also requires an individual wire (D-lead)
for actuation of the UV test lamp (shielded wire is rec-
ommended). Use a common wire for all detectors for the
+290 volt dc supply (A-lead). The detectors may be
located up to 2000 feet (600 meters) from the controller.
An 18 gauge wire from each detector housing to earth
ground is required for prevention of false detector actu-
ation due to high electrostatic charges.
Characteristics of 22 Gauge Copper Wire
Metric U.S. Customary
Diameter 0.6439 mm 0.02535
Cross Section 0.3255 mm2 0.0005 in2
Resistance 33.3 ohm/km 10.15 ohm/1000 ft
SHIPPING WEIGHT (APPROXIMATE)—
Pounds Kilograms
R7404 Controller 2.5 1.1
C7051 Detector (aluminum) 6.0 2.7
DIMENSIONS—
The dimensions given for the R7404 Controller in Figure
8 are for the unit only. If the optional Q4004 Mounting
Cage is used, the dimensions given in Figure 9 apply.
See Figure 10 for mounting dimensions of the C7051
Detector.
DETECTOR ENCLOSURE RATINGS—
Watertight, dust-tight, designed to meet NEMA stan-
dards Publication IS 1.1-1975 for type 4 enclosures.
CSA certified Enclosure 4.
Hazardous locations: Designed for Class I, Groups B, C
and D; Class II, Groups E, F and G. CSA Certified for
Class I, Groups C and D; Class II, Groups E, F and G.
10
9.5 (242 MM)
7.0
(177 MM)
2.0
(50MM)
F234
Figure 8—Dimensions of R7404 Controller in Millimeters (Inches)