MOVEMENT SENSOR TECHNOLOGY
The benefits of an occupancy sensor? They’re a simple energy saving solution. When the room is vacant the lights will turn off – the duration times, sensitivities may all be altered but the general concept remains the same. With highly customizable settings, the Cosine Developments occupancy sensors are the number one on the market.
Microwave sensors are triggered by movement within a bubble of energy. They are better at detecting movement back and forth from the sensor than movement circling around it. They can sense through soft materials like glass and wood and are ideal for public restrooms to keep the lights on when cubicles are occupied. There are no blind spots to this sensor and it is not affected by air turbulence. However, the downside is that it detects movement in next-door rooms and behind doors. So, it may not be suitable for compact offices where multiple rooms are next to one another.
Infra-red occupancy sensors are triggered through the movement of passing heat sources between the segments of its lens. These sensors by nature are less sensitive to radial movement – back and forth from the sensor; but are more susceptible to tangential movement – movement around the sensor. The benefit of using an infra-red occupancy sensor is that it cannot detect through soft furnishings, and is limited to sensing in line of sight. One such scenario is that if it were to be placed inside a building with multiple rooms next to one another, it will not detect occupants within the room next door – whereas the microwave sensor would. Therefore this sensor is highly beneficial in scenarios where one would only like the detection to be within the room it is placed.
The negative of using an infra-red occupancy sensor is that it cannot detect through soft furnishings such as that of wood, glass etc. What makes it beneficial can be its weakness in some scenarios. For example, a public restroom would require an occupancy sensor to detect occupants within the cubicles – the infra-red could not detect the occupants and will therefore not work in such a scenario. Another negative is that it is susceptible to air turbulence, which is caused when hot air and cold air intermingle, which would cause the sensor to trigger. This means that the sensor may not be placed nearby to air-conditioning units or heaters etc.
INFRA-RED & ACCOUSTIC TECHNOLOGY
The dual technology sensor has the standard perks and negatives of infra-red technology with the added benefit of retriggering the timer with noise picked up within the room or surrounding environment. The sensor cannot be triggered solely with noise, it has to detect movement first and then only the acoustic sensor is engaged – this is so that the lights do not turn on every time there is a thunder storm or a car hoots nearby.
The benefit of using such technology is that people don’t necessarily move around when they are working at their computers, therefore a normal sensor could turn off because there is no movement. With the acoustic function added to the sensor it just needs an initial movement to trigger it, then it remains on so long as there is any noise source.
OCCUPANCY SENSOR PRODUCTS
SURFACE MOUNT INFRA-RED OCCUPANCY SENSOR
The CD-IR28B is an active infra-red motion detector. It senses changes in heat via its Fresnel lens to detect human movement. The sensor detects even the slightest movement in the detection zone…
MICROWAVE OCCUPANCY SENSOR
The CD-MV360S is an active microwave motion detector. It emits a high frequency electro-magnetic wave of 5.8GHz and receives the Doppler echo. The sensor detects the change in the Doppler echo even from the slightest movement in the detection zone…
RECESSED MOUNT INFRA-RED OCCUPANCY SENSOR
The CD-Y41 is an active infra-red motion detector. It senses changes in heat via its Fresnel lens to detect human movement. The sensor can detect even the slightest movement in the detection zone…
RECESSED MOUNT MICROWAVE OCCUPANCY SENSOR
The CD-MV16 is an active microwave motion detector. It emits a high frequency electro-magnetic wave of 5.8GHz and receives the Doppler echo. The sensor detects the change in the Doppler echo even from the slightest movement in the detection zone…
DUAL TECHNOLOGY (PIR + SOUND) SENSOR
This is a dual technology occupancy sensor with both passive infra-red (PIR) detection and noise (sound) detection. Lighting will be activated after movement is detected…
FIXTURE EXTERNAL ON/OFF PIR SENSOR WITH IP65
The miniature PIR (passive infra-red) presence detector provides automatic control of lighting loads. It is specifically designed for mounting onto a batten style luminaire. The detector will switch incandescent, fluorescent, compact fluorescent and LED lighting…
INFRA-RED FIXTURE INTEGRATED FOR HIGH BAY LIGHTS
The product is a new energy-saving switch, it adopts good sensitivity detector, integrated circuit, and SMT. It gathers automatism, convenient safe, energy-saving, and practical functions…