Warehouse presence detector

April 2012 Sensors & Transducers

The MWS7 from CP Electronics is a microwave presence detector that provides automatic control of lighting loads, and is especially suited for warehouse applications. When a person or fork lift truck enters the aisle or corridor, the detector turns the lights on, or raises the level of light output. After a predetermined period, the lights are turned off or dimmed down. The detector uses advanced microwave technology that allows the range of detection to be accurately set, irrespective of whether the object is a person or a fork lift truck. A common problem with other types of detectors is that larger objects are picked up at longer distances, making accurate setup impossible. A further benefit of the MWS7 is that it has good immunity to vibration.

Three output channels are provided: a switching channel with a high power relay; a switching channel with a low voltage, low power isolated contact; and a dimming channel capable of controlling up to 20 DSI or DALI ballasts.

The detector has a built-in photocell that measures the overall light level in the detection area. This can be used to turn the lights on and off when natural light is sufficient. It can also be used on dimming systems to calculate the correct output for the luminaires to achieve a preset lux level (maintained illuminance). The dimming channel can set the luminaires to a standby dim level rather than switching off completely.

Input terminals are provided to give the following features: manual override of the dimming levels and switched outputs; slave detector input for use in dimming systems; and an external lux input which disables the output when there is sufficient natural light.

Manual adjustments can be made to the sensitivity, range, lux and time settings using the physical controls inside the sensor. Alternatively, an integral infrared sensor in the unit allows the unit to be programmed using the optional DD-LCDHS-LR programming handset. This works to a range of 15 metres giving complete flexibility over many of the operating parameters.

For more information contact Chris Huxham, Shorrock Automation, +27 (0)12 345 4449, [email protected], www.shorrock.co.za

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