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
Wiring diagram
Installation
Note: To switch from more
than one position simply
wire two or more sensors
in parallel.
Power-up test procedure
Power the sensor up—the load should come on immediately.
Set the Lux level to maximum and the time to minimum.
Vacate the room or remain very still and wait for the load to switch off (should take no more than 2 minutes).
Check that the load switches on when movement is detected.
To set the final Lux level wait until the level of natural daylight is just enough that lighting is required. Starting with
the Lux control at minimum, slowly increase the Lux until the lights come on. Note that when the Lux control is at
maximum then the lights will always come on with occupancy.
Set the time required.
Set-up
To program a Time or Lux setting
Press and release either the Time or Lux Button quickly
(presses within 1 second of each other) to access 1 of 5
settings. 1 second after the switch has been released, the
LEDs will flash to signify which setting has been loaded.
To find out what the Lux or Time has been set to
Press either switch for more than 3 seconds then release.
The LED will flash to signify the setting.
To lock the programmed settings
Use to stop accidental re-programming of the sensor.
Press either switch for more than 10 seconds and do not
release. It will toggle between lock and unlock. If the
sensor was unlocked, whilst the button is pressed the LED
will be lit, after 10 seconds it will extinguish. If the sensor is
locked, the LED will flash once after 10 seconds.
Button
presses
1 10 seconds 1
2 5 minutes 3
3 10minutes 5
4 20 minutes
5 30 minutes 9 (default)
LED flashes
Time Lux
(default)
(minimum)
7
Always on /
lux disabled
Fault finding
What if the load does not turn ON?
Check to see if the live supply to the circuit is good. Strap across the L and LIVE OUT terminal to turn the load on.
If the supply and wiring are good, check the Lux level setting. Increase the Lux level setting to allow the controller to
turn on at higher ambient natural light level.
If the detection range is smaller than expected, check the Detection Diagram above. Rotating the sensor slightly may
improve the range.
What if the load does not turn OFF?
Ensure that the area is left unoccupied for longer than the Time Out Period.
Ensure that the sensor is not adjacent to circulating air, heaters or lamps.
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Detection diagram
Technical data
Area of lower sensitivity Area of high sensitivity
Weight 0.15kg
Supply Voltage 230VAC +/- 10%
Frequency 50Hz
Circuit protection 10A
Maximum Load 10 Amp resistive and incandescent lighting
6 Amp fluorescent lighting and resistive
3 Amp compact fluorescent lighting
3 Amp low energy lighting
3 Amp low voltage lighting (switch primary
of transformer)
Fluorescent lighting (max 6 fittings
recommended)
For fluorescent lighting total power factor
correction capacitance must not exceed
40μF.
3 Amp fans and ventilation equipment
Switch SON lighting loads via a contactor
Minimum load 100mA
Power consumption On 572mW, Off 670mW
Terminal Capacity 2.5mm2
Temperature -10ºC to 35ºC
Humidity 5 to 95% non-condensing
Material (casing) Flame retardant ABS and PC/ABS
Type Class 2
IP rating 40 without gasket. 54 with gasket.
Compliance EMC-2004/108/EC
LVD-2006/95/EC
GESM (with gasket fitted) Dimensions See diagrams opposite
IMPORTANT NOTICE!
This device should be installed by a qualified electrician in
accordance with the latest edition of the IEE Wiring
Regulations and any applicable Building Regulations.
FM 45789 EMS 534520
Due to our policy of continual product improvement CP Electronics reserves the right to alter the specification of this product without prior notice.
4
C.P. Electronics Ltd
Brent Crescent
London
NW10 7XR
United Kingdom
Tel: + 44 (0) 333 900 0671
Fax: + 44 (0) 333 900 0674
www.green-iswitches.co.uk
enquiry@green-iswitches.co.uk
Ref: #WD501 Issue 2
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