Data Sheet for Product

s Canada Limited Cerberus® PRO
Specifications ─ (continued)
The remote alarm indicator (Model FDBZ-RTL) allows for
manual testing via a key-switch for the conventional
detector as well as the conventional air-duct housing with
relay. Model FDBZ-RTL, which mounts remotely from the
conventional air-duct housing, allows for manual relay-
output control. The duct-detector remote indicator key-
switch also indicates the current state of the detector.
The watertight housing (Model FDBZ-WT), which allows
the air-duct detector housing to be installed inside the
separate NEMA 4X enclosure, is for installations for either
an outdoor area or in environments where excessive
moisture is prevalent.
Each detector unit employs a cross-sectional sampling
principle of operation. Inlet sampling tubes are
available in four (4) lengths (see:
Sampling Tube Selection
Table
). Outlet sampling tubes are one (1) common length
and draw. A continuous, cross-sectional sample of air
moves through the duct. Stratification or skin affect
phenomenon that occurs in the duct can prevent smoke
(especially in large ducts) from reaching a spot-type
detector.
In addition, the unique design of the sampling chamber
insures uniform sensitivity in air velocities, ranging from a
low of 100 fpm to as high as 4,000 fpm. Duct housings
come with three (3) wiring entry ports:
 Two (2) 3/4” conduit knockouts
 One (1) 1/2” conduit opening
The inlet sampling tube length is determined by the width
of the air duct being protected. The inlet tube
─ greater
than and nearest to the duct width
─ should be used (see:
Sampling Tube Selection Table). The inlet tube can then be
trimmed at the job site to the exact width of the duct. The
outlet sampling tube for all ducts
─ irrespective of width ─
has a fixed length of approximately 5.5 inches (14 cm.),
and is supplied with the air-duct housing.
Note: When the use of a remote relay is required, order
Model FDBZ492-R for conventional systems;
Model FDBZ492-HR for addressable systems.
When required, a separate watertight enclosure
(Model FDBZ-WT), which is designed to contain
the air-duct housings is available.
(For full details, refer to installation instructions
for the respective air-duct housing.)
Note: When a self-contained duct detector with power
supply is required, order Model FDBZ492-RP.
(For full details, refer to installation instructions
part number A6V10330327.)
Sampling Tube Selection Table
Duct Width
Sampling Tube
(Model No.)
For duct widths 6” to 1’ ST-10
For duct widths 1’ to 3’
ST-25
For duct widths 3’ to 5’
(requires support)
ST-50
For duct widths 5’ to 10’
(requires support)
ST-100
Maintenance of the detector is easily accomplished via the
removal of the duct-housing sampling chamber cover. The
detector, which plugs into the housing, is easily removed
for cleaning or replacing by a trained technician.
All that is necessary for installation of the air-duct detector
is the cutting of three (3) small holes for the Sampling Tube
installation (template included), and the drilling of two (2)
holes for mounting the air-duct housing. The unit is then
easily mounted in place, and connection made to the
existing wires or terminals
─ if optional accessories are
utilized. No mechanical tools are required for removing the
cover or connecting the sampling and exhaust tubes to an
air-duct housing.
Models ST-50 and ST-100 require support. However,
Model ST-100 is shipped in two (2) 5-ft. (152 cm.)
pieces with a coupling for field assembly.
Technical Data
Operating
Temperature 0°C (
+
32°F) to 49°C (120°F)
Ranges:
Sampling Tube Pressure > 0.026 cm.
Range of Differences: < 3.1 cm. of
water column
Relative Humidity: 0 ─ 95%; non-condensing
Air Pressure / No effect /
Altitude Range: No limitations
Air-Duct Velocity: 31 ─ 1,219 meters / min
Dimensions: { H -x- W -x- D }
 Rectangular: 37 cm. -x- 12.7 cm. -x- 6.36 cm.
(14.38” -x- 5” -x- 2.5”)
 Square: 19.7 cm. -x- 22.9 cm. -x- 6.36 cm.
(7.75” -x- 9” -x- 2.5”)
Detector Weight: 0.82 Kg. (1.8 Lbs.)
Notes to Architect: When building codes regulate the location of
detectors within ventilating systems, make
sure the number and locations of detectors are
in accordance with the code regulations.
For additional electrical specifications,
please see the installation instructions
of the corresponding air-duct housing.