Microwave Sensors on Temporary Lighting

As part of an ongoing effort to minimise carbon dioxide emissions, Multiplex, working in collaboration with Cape (Electrical & Mechanical) has successfully procured the use of microwave sensors within the temporary LED lighting package at the Marble Arch Place project.

There are many advantages to using microwave sensors over traditional head-end controlled and passive infrared sensors (PIR) temporary lighting systems. Crucially, the sensors deliver an overall financial saving despite a higher upfront cost, this is achieved through a significant reduction in energy consumption. The reduction in energy consumption directly corresponds to a decrease in carbon dioxide emissions and is additional to the savings already achieved through the use of LED.

Based on occupancy estimates, this will save 23,508kg of carbon dioxide emissions each year of the project compared with head-end controlled equivalent lighting. Over the course of the project, this is the equivalent to the carbon dioxide sequestered by 1,218 tree seedlings grown for 10 years.

The system works by emitting a microwave signal and measuring the rebound or ‘echo’ time, which is then used to calculate the distance from stationary objects and establish a baseline measurement. Any movement within the motion detector’s field of view alters the echo time thereby triggering the lighting unit.

The use of microwave lighting system embodies Multiplex and Cape’s commitment to sustainable business by producing a ‘win-win’ from both a cost and carbon perspective.

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