15
The 4098-9685, 4098-9686, 4098-9688, 4098-9755 or 4098-9756 Duct
Detector/Sensor should be installed in a location of relatively nonturbulent air
flow and within the intended operating velocity range of 300-4000 feet-per-
minute (91 to 1220 M/min.).
Simplex recommends measurements of air flow and examination of engineering
specifications that define expected duct air velocities under all conditions. This
is done to determine if a location is suitable for duct detector/sensor operation.
An Alnor Instrument Co. (Chicago) Model 6000P Velometer or equivalent (not
supplied) may be used to check the duct air velocity.
1. It is recommended to locate detectors/sensors a minimum of six duct widths
downstream from bends or inlets. Such locations ensure that air flow is non-
turbulent and that smoke is properly mixed with air in the duct for maximum
detector/sensor efficiency. See Figures 9 and 10.
Note: Installation of a duct detector/sensor to a round duct is the same as
shown in Figures 9 and 10 as long as the round duct is 18 inches or
larger (45.7 cm) in diameter.
6 DUCT WIDTHS
MINIMUM
BEND OR OTHER
OBSTRUCTION
Figure 9. Duct Housing Placement - Location of Bends or Inlets
6 DUCT WIDTHS
MINIMUM
RETURN AIR
INLET
Figure 10. Duct Housing Placement - Location of Air Return Inlet
2. Locate duct housings so that dampers do not restrict air flow at the
detector/sensor location. See Figure 11.
3. Locate air duct detectors/sensors on the return or supply duct of the
equipment’s air handling system. However, detectors/sensors should NOT
be installed in the return air damper branch. See Figure 11.
Continued on next page
Installation
Pre-Installation Routines
Rules to Follow
Technical Manuals Online! - http://www.tech-man.com
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