The Watt Stopper Inc. FM105 User Manual

The FM-105 microwave occupancy sensor uses ultra-high-
frequency radio waves, also known as “microwaves” and 
the principle of the Doppler Effect to detect motion. The 
sensor sends out radio waves that bounce off of nearby 
surfaces and return to the sensor. Motion in the area 
changes the speed of the waves returning to the sensor. The 
sensor detects the change and interprets it as occupancy. 
This causes the sensor to turn ON the load.

Microwaves can penetrate certain materials, therefore, 
the FM-105 can be installed behind a luminaries’ plastic or 
glass lens.  

The FM-105 can be used in a water-tight non-metallic box 
or water-tight luminaire for wet location applications.

The FM-105 also has daylighting control capability. The 
daylight control on the FM-105 is a “HOLD-OFF” type. The 
sensor stops the load from turning ON if the ambient light 
is greater than the daylighting setpoint. If the load is already 
ON, the sensor will not turn OFF the load due to high 
ambient daylight.

 

6’ (2m)

12’ (4m)

18’ (5.5m)

MAX.
20’ (6m)

MIN.
3’ (1m)

6’ (2m)

12’ (4m)

18’ (5.5m)

MAX.

MIN.

FM-105
inside
ceiling mount
fixture 
at 8’ (2.5m)
height

Voltages .......................................... 120/277VAC,  50/60Hz

Load Requirements

  @ 120VAC, 60Hz .................0-800W ballast or tungsten

  @ 277VAC, 60Hz ...................................0-1200W ballast

Trimpot Adjustments

 Light 

Level 

.........................................................2-200fc

  Range/Sensitivity ...........................3’ to 20’ (1m to 6m)

  Time Delay ...........................10 seconds to 30 minutes

Power Output ... 1 mW (similar or less than a cell phone)

Frequency .............................................................. 5.8GHz

1. 

Determine the mounting location inside the luminaire 
or other suitable enclosure. If the daylight feature will 
be used, be sure to locate the sensor where daylight is 
not completely obscured from the sensor. 

2. 

Attach the metal shield to the FM-105 so that the 
shield is located between the FM-105 and the lamp. 
Make sure that the wiring terminals on the FM-105 are 
accessible.

3. 

Put the plastic mounting foot onto the base of the 
FM-105 to secure the metal shield in place.

4. 

Secure the FM-105 assembly in place using screws 
through the plastic mounting foot.

5. 

Connect the line voltage and load wires to the FM-105 
terminals as shown in the wiring diagram.

 

• 

Do not allow bare wire to show. 

 

• 

Make sure all connections are secure.

6. 

Restore power from the circuit breaker.