GESM
Product Guide
Surface Mounted PIR Movement Sensor
The GESM movement sensor is designed to provide
automatic control of lighting, heating or ventilation loads. It
detects movement using a PIR sensor and turns the load
on. When an area is no longer occupied the load will switch
off after an adjustable time out period.
An adjustable internal light sensor provides additional
energy saving in lighting applications. When an area is
occupied, lighting is only switched on when the level of
natural light falls below a preset level.
When the sensor is first powered up the PIR sensor will
always detect immediately regardless of whether the room
is occupied.
Overview
Front features
Lux Button
Back features
Power Input
& Switched
Output
connections
Time Button
Sensor Lens
which covers...
PIR Sensor
Light Level Sensor
LED
Features
PIR Sensor
Detects movement within the sensor’s detection range,
allowing load control in response to changes in occupancy.
Light Level Sensor
Measures the overall light level in the detection area
LED
The red LED is used for feedback information during Setup. See Set-up section.
Power Input & Switched Output Connector
Used to connect mains power to the sensor and to connect
a switched load.
Lux Button
Use to set the Lux level for Lux switching. See Set-up
section.
Time Button
Use to set the Time delay after which the load switches off
when an area is vacated. See Set-up section.
Sensor functionality
Movement Detection
When movement is detected the load will automatically turn on. When the area is no longer occupied the load will
automatically switch off after an adjustable time period.
Lux level switching
The GESM has a built-in adjustable lux sensor which will keep the lighting switched off if there is sufficient natural light.
The Lux level is set using the Lux Button on the front of the sensor.
Installation
Choosing a suitable location
The GESM is designed to be ceiling mounted and must satisfy the following criteria:
The sensor should be sited so that the occupants of the room fall inside the detection pattern overleaf, at a
recommended height of 2.8m on the ceiling. Note that the lower the sensor is installed the smaller the detection
range will be, subject to the parameters shown on the diagram.
Avoid positioning the sensor where direct sunlight may enter the sensor element.
Do not site the sensor within 1m of any lighting, forced air heating or ventilation.
Do not fix the sensor to an unstable or vibrating surface.
Components
Gasket
(optional)
Mounting
plate
Sensor
Head
2a
2b
Rear entry
Pass cable through
Gasket and Mounting
plate
Side entry
Pass cable through
either of the 2 side
entry points in the
Mounting Plate
Conduit
3
Wire cables
into the
terminals
4
Push the Sensor
Head onto the
Mounting Plate and
align clips with
slots on Sensor
Head
1
Screw the Mounting plate and optional Gasket to the
ceiling via the 4 mounting holes.
Note: 2 holes are suitable for BESA boxes, 2 are
suitable for UK or EU 60mm fixing backboxes.
2
Knock-outs on Sensor
Head for clearing side
entry of conduit and /
or cables
5
Use a flat bladed
screwdriver to unclip
the Mounting Plate from
the Sensor Head
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