Wall PIR Presence Detector with Adjustable Lux Level Sensing and Time Delay, CP Electronics SPIR-PRM Occupancy Sensor

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

Part of the wide range of SPIR energy-saving switches from CP Electronics, the SPIR-PRM is a contemporary PIR presence detector with lux level sensing and time delay function. The SPIR-PRM presence detector switches from CP Electronics are designed to provide automatic control of lighting, heating or ventilation loads. They detect movement using a PIR sensor and turn the load on. When an area is no longer occupied the load will switch off after an adjustable time out period. An internal light sensor provides additional energy savings in lighting applications. When an area is occupied lighting is only switched on when the level of natural light is below a preset level. When the SPIR-PRM detector is first powered up the PIR sensor will always detect immediately regardless of whether the room is occupied. A selectable power-up delay allows the installer to choose whether the load comes on immediately when the unit is powered up or is kept off for a small time (about 40 seconds) to allow the sensor to settle. The CP Electronics SPIR-PRM is a contemporary-styled presence detector switch based on the successful, tried and tested SPIR. Fits a single gang standard switch box or a shallow back box with an extender (supplied). Suitable for the control of lighting, ventilation, and heating.. To switch from more than one position simply wire two or more units in parallel to achieve two way and intermediate switching. The detector should be sited so that the occupants of the room fall inside the detection pattern shown below, at a recommended height of 1.2m to 1.5m for wall sensors. Note that the higher the sensor is installed the shorter the detection range will be. The CP Electronics SPIR-PRM detector - Technical specs Load taken: # 16 Amp resistive load; # 10 Amp incandescent lighting; # 6 Amp fluorescent lighting; # 3 Amp compact fluorescent lighting; # 3 Amp low energy lighting; # 3 Amp low voltage lighting (switch primary of a transformer); # 3 Amp fans and ventilation equipment; # Switch SON lighting loads via a contactor; # Quartz halogen heaters: 2600W max, recommended timing 30 minutes, for lower timing switch via contactor; Supply Voltage: 220-240 Volts AC 50 Hz; Time Out Period: Adjustable 10 seconds to 60 minutes in two ranges; Light Level: Optional adjustment by thumbwheel light to dark; Terminal Capacity: 2.5mm2; Material: Flame retardant ABS TYPE Class 2; Temperature: -10°C to 35°C; Conforms to BS EN60669-2-1 & BS EN55015.Buy this CP Electronics Detector at Sparks