Legrand CSU User Manual

Syracuse, NY 13221-4822

800.223.4185
www.passandseymour.com

Installation Instructions

CSU Series

32kHz

Ultrasonic Occupancy Sensors

UNIT DESCRIPTION

The Pass & Seymour ultrasonic occupancy sensors operate on 24VDC and automatically turn
lighting systems on and off based on occupancy. The sensors use Doppler technology to sense
occupancy. They broadcast high frequency sound waves into the controlled area. Movement in the
area will cause the sound waves to return to the sensor at a faster or slower rate resulting in a
doppler shift and occupancy detection. When the ultrasonic sensor detects occupancy, it switches
lighting on through a Pass & Seymour Power or Slave Pack.

COVERAGE PATTERNS

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UNIT PLACEMENT

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Placement of ultrasonic sensors is critical for proper operation. It is best to place the sensor so that
it has a clear view of all desktops and work surfaces within the coverage area. Orientation of the
sensor is also important. The CSU600 offers 360° one-sided coverage while the CSU1100 and
CSU2200 provide 360° two-sided coverage.

Transducers (the two or four small round openings on the cover of the sensor) operate in pairs
(see the Coverage Patterns graphic, previous page), and the centerline of the pair must be oriented
correctly for proper coverage.

Note:

• The transducer pairs orientation determines the coverage pattern.

• Sensors should not be mounted so that transducers point toward a wall that is within
4 feet of the sensor.

• Ultrasonic sensors may false trigger when exposed to high
volumes of air flow. Sensors should be installed at least
4 feet from supply ducts and a minimum of 6 feet from
horizontal discharge ducts.

• Do not mount sensors within 6 inches of a power pack.

• Always mount the sensor on a rigid vibration free surface.

• When mounting multiple sensors in a large room, do not
mount the sensors within 10 feet of each other.

Open Office Sensor Placement

A typical layout for an open office space is to place
the ultrasonic sensors so they control the office area
in zones that overlap. A 20% coverage overlap
is recommended.

Enclosed Office Sensor Placement

For smaller enclosed spaces, a CSU600 is recommended.
Sensors should be placed so that they will not detect motion through an open door.

Transducers must face into the room and not be directed toward the closest walls or doors.

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Coverage

Overlap

(CSU2200

shown)

INSTALLATION

Note: Always try to attach the sensor to a vibration free surface.

Acoustic Tile Mounting

Install the Threaded Insert, flange side, into the hole on the
back of the sensor and turn clockwise until it locks.

Keyhole Mounting

Positioning of keyhole mounting screws is important so that
the transducer pairs point in the desired direction.

1. Use the template below to mark the location of
mounting screws.

2. Install the provided screws—leaving approximately
3mm (1/8") space from the bottom of the screw head
to the ceiling (see diagram).

3. Place the sensor’s mounting keyholes over screw
heads and rotate sensor clockwise until secured.

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7/8" (22mm)

hole

Screws:
103mm (4.1") apart

Ceiling

Rotate
clockwise

Space:

3mm/(1/8")

Nut

Washer

Threaded
Insert

Ceiling
Tile