2
CAUTION
WATTSTOPPER RECOMMENDS ADDING A
20KA SURGE SUPPRESSOR TO PROTECT
THE FIXTURE, DRIVER AND FSP SENSOR.
There are three configurations of the sensor:
• The FSP-321B mounts inside the fixture.
• The FSP-321B-S mounts to a fixture or an enclosure with a 1/2”
knockout.
• The FSP-321B-D mounts to a pole or fixture.
Mounting Inside the Fixture
1. Determine an appropriate mounting location inside the light fixture
minimizing the electric light contribution to the sensor’s photocell.
Allow a minimum distance of 0.2” (5.1mm) from the wiring end of
the sensor to the wall of the fixture.
2. Drill a hole 1.30” (33.0mm) in diameter through the sheet metal in
the bottom of the fixture.
3. Add the rubber gasket to the threaded collar, and install the sensor
face down, parallel to the mounting surface. Ensure the rubber
gasket touches the inside surface of the fixture. Install the tightening
nut securely against the fixture to a torque of 25-30 in-lbs to ensure IP rating is maintained.
NOTE:
An optional collar can be installed in place of the tightening nut on the FSP-321B. This collar is included with the
FSP-321B-S and FSP321B-D, as shown below.
Mounting to a Fixture/Enclosure – Straight Nipple
1. Determine an appropriate mounting location minimizing the electric light contribution
to the sensor’s photocell.
2. If there is no knockout, drill a hole 0.875” (22mm) in diameter through the sheet
metal in the fixture or enclosure.
3. Add the rubber gasket to the nipple, and install the sensor face down. Ensure the
rubber gasket touches the surface of the fixture. Install the nipple nut securely
against the fixture to a torque of 25-30 in-lbs to ensure IP rating is maintained.
Mounting to a Pole or Fixture – Drop Nipple
1. Determine an appropriate mounting location on the pole.
2. Drill a hole 0.875” (22mm) in diameter through the pole.
3. Add the rubber gasket to the nipple, and install the sensor face down. Ensure the
rubber gasket touches the surface of the fixture. If needed, add the nut between the
sensor body and the rubber gasket to ensure a secure fit. Install the nipple nut securely
against the fixture to a torque of 25-30 in-lbs to ensure IP rating is maintained.
Completing the Installation
1. Align the locking features between the sensor and lens module and push the lens
module forward until the o-ring seals firmly. Turn the lens module clockwise to
ensure it locks in place.
2. Connect wires as shown in wiring diagram.
3. Restore power from the circuit breaker.
NOTE:
The IP66 rating for this unit is based on proper installation as indicated above.
However, as Fixture housings may vary in thickness, material, and hole dimensions
to accommodate this unit, all precautions to maintain IP66 should be considered
with the combination and installation of the unit to the Fixture Housing. This includes
installation to an IP66 rated Fixture Housing and use of suitable outdoor rated
silicone seals or accessories.
Tightening Nut
(or Optional Collar)
Fixture
Wall
Lens Assembly
Outside
Fixture Wall
Inside Fixture
Wall
Mounting Within Fixture
Tightening Nut
(or Optional Collar)
Rubber
Gasket
Rubber
Gasket
1
2
INSTALLATION
WARNING
TURN THE POWER OFF AT THE CIRCUIT
BREAKER BEFORE INSTALLING THE SENSOR.
Straight Nipple Mount
Nipple
Rubber
Gaskets
Nipple
Nut
Drop Nipple Mount
Nipple
Nut
Nipple
Rubber
Gaskets
Drop Nipple Mount
Nipple
Rubber
Gaskets
Nipple
Nut
Nut
NOTE:
The Outside Fixture Wall thickness should be no
greater than 0.125” (3.18mm) for optimal sensor
mounting and security.
LENS OPTIONS
Several lenses are available for use with the FSP-321B. Lenses give coverage at mounting heights between 8’ - 40’ for applications
such as, offices, warehouses and outdoor use. Density and range of the coverage is determined by the type of lens and mounting
height. A lens with shroud option is also available. The shroud blocks light coming from the fixture, to prevent interference with the
photocell function of the sensor. Lens modules are IP-66 rated when combined with an FSP-321B sensor mounted to an outdoor rated
fixture. See the FSP-Lx Coverage Guide for more information.
