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IP54 Push Button Round Ceiling PIR Occupancy Sensor for Surface Mounting, CP Electronics GESM

Model No. GESM by: CP Electronics
Availability: Usually 2 - 3 Days


List price £41.10
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(over £100+VAT, applies to zones A&B only , £6 +VAT otherwise)
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This is the CP Electronics GESM Push button, IP54 rated, surface mounted ceiling PIR - occupancy sensor - in white, round shape. Part of the Green-i range of energy saving devices from CP Electronics. It is suitable for controlling incandescent, fluorescent, CFL, and LED lighting, and it can be used for resistive heaters. With its easy push button set up, coupled with a two part surface mount body, this PIR occupancy sensor is ideal for first fix installation.

This surface mounted 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.

IP54 Surface Mounted PIR Movement Sensor - 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

GESM Round PIR Occupancy Sensor IP54 - Key features

  • Presence detection and lux level sensing – auto on, auto off
  • It works with any type of lamp, including LED
  • You can adjust time delay and lux settings via push buttons
  • It has lockable settings
  • IP rating: IP54 rated
  • It has an iIntegral power supply
  • It is suitable for lighting, heating or ventilation
  • It comes with a 5 year manufacturer warranty

IP54 Surface Mounted PIR Movement Sensor - Specs

  • Weight: 0.15kg
  • Supply Voltage: 230VAC +/- 10%
  • Frequency: 50Hz
  • Circuit protection: 10A
  • Load rating at 230V AC:
    - 10A incandescent lighting
    - 6A fluorescent lighting (max 6 fittings recommended)
    - 3A CFL and LED lighting,  low energy lighting; 3 Amp low voltage lighting (switch primary of transformer)
    - 3 Amp fans and ventilation equipment Switch SON lighting loads via a contactor Minimum load 100mA
    - 10A Resistive Heaters
    Note: For fluorescent lighting total power factor correction capacitance must not exceed 40µF
  • Time delay: 10s - 30min
  • 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 electrical rated
  • IP rating: IP40 rated without gasket. IP54 with gasket.
  • Compliance: EMC-2004/108/EC, LVD-2006/95/EC, CE Mark

Note: Some images and pictures are for reference only. The item may differ from the image/picture due to manufacturer's change. Should you require the exact item in the picture, please call or email us to enquire.

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Microwave Occupancy Detectors: Are They Better or Worse than PIR Sensors?

We talked about motion sensors on the blog recently, but most of the items in our store are Passive Infra-Red (PIR) devices, which are great - but they're not all we have. In the Sparks Direct store, you'll also find a couple of microwave motion detectors: a completely different technology. How do They Work?  A microwave motion detector emits pulses of specific microwave frequencies and then measures reflection off objects (like walls) when those waves return to the sensor. In this manner, the whole area of detection is filled, and the reflections change when there is a moving object (like a person) in the area. It works very much like the radar guns used by police to catch speeding drivers in the act - these detectors 'sense' motion in terms of speed and size, as opposed to a PIR sensor which senses in terms of heat and light.Benefits The reflection mechanism means that the line-of-sight problems of PIR sensors - the effect that means a sensor can't detect movement if it occurs around the corner - is reduced, and the microwaves emitted can penetrate most building materials. This means that sensors integrated into light fittings can be protected against dust and moisture intake by design. They are also affected by background temperature, in contrast with PIR sensors which often don't operate well above 35° Celsius. Microwave occupancy detectors have a considerable lifespan of around 100,000 hours. Any worries about microwave radiation should be curbed; the devices in our store are very low-power and pose no threat. Drawbacks However, although these sensors detect motion through wood and most building materials, microwaves do not penetrate metals. Metal objects act as a shield, which creates shadows or "dead zones" behind them. Also, everyday movements such as objects blowing in the wind can trigger a false alarm - even fluorescent lights, which emit detectable light particles, can activate the sensor erroneously. For these reasons, we would recommend that a microwave sensor be paired with a PIR motion detector. The strengths of one device can account for the weaknesses of the other. If you're interested in purchasing an advanced microwave detector, we stock the low-profile MWS6-PRM and the adjustable MW3SA-PRM, both from industry leader CP Electronics.Microwave Sensor Lights


Sparks Direct delivers via courier to the UK only; the standard delivery charge is £6 + VAT for all orders under £100 + VAT. If your order is over £120, you get free delivery (unless there's a special delivery charge for the items you wish to order or you're in shipping zone C or D). Full details for shipping charges can be found via Terms and Conditions.

If the items you order are in stock and the order is placed before 1.00pm, delivery can be made within 1-2 working days. If the items are not in stock, we will inform you via email how long it will take or ask for your confirmation if there's a long lead time.


We offer 30-day returns for unwanted items - please email us to request a returns number which will need to be quoted when the items are returned. For faulty items or items damaged in transit, please advise via email, and an appropriate returns number will be provided. Full details concerning returns and refunds can be found via our Terms and Conditions.