Telescopic floodlights use position sensors

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Cable-extension position transducers are a primary component for the telescopic floodlighting installed at the Brit Oval and Lord’s cricket grounds for the 2009 ICC World Twenty20 Cricket Championships.

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Telescopic floodlights use position sensors
Telescopic floodlights use position sensors

The main contractor, Nottinghamshire based Abacus Lighting, provide end to end exterior and sports lighting solutions from detailed design at the planning stage through to manufacture and installation. They chose PT9000 series ‘stringpot’, distributed by Variohm, to measure and reliably ensure repeatable position feedback for each hydraulically actuated telescopic column which elevates up to 100 2kW Challenger 3 floodlights on a10 x 6 m head frame.

The new patented telescopic masts have proved the perfect solution to overcome the strict planning regulations required by local authorities for both cricket grounds which are located in residential areas. By telescoping the masts from a rested height of 30m toa typical operational height of 49m, both the visual impact and lighting overspill are minimised whilst fully complying with the ECB standards that ensure much higher quality pitch illumination for players and broadcasters alike.

The PT9000 series cable-extension transducer is aimed at long range linear position measurement up to 45m in a sealed design that meets IP69 standards for harsh environment applications. Cable-extension position transducers are simple to install and the spring loaded spool, flexible cable and a rotary sensor mechanism will tolerate a high level of misalignment between the cable fixing point and the housing.

For the Twenty20 application, a 4-20 mAoutput version was supplied although the range includes potentiometer, incremental encoder and voltage outputs as well as RS232, CANbus and DeviceNet alternatives.

The flexible PT9000 series includes a wide choice of stroke range and cable exit/mounting orientation with comprehensive options for output configuration and cable or connectorised electrical connection. The durable and compact sealed housing fits within an envelope of 240 x 122 x 132mm and is offered in a choice of powder coated aluminium or stainless steel enclosure materials.

The PT9 is also available for longer stroke ranges up to 45m and for extreme applications where exceptional amounts of dirt, spray or foreign matter may enter through the standard PT9000 series ‘slot opening’and interfere with the cable reel mechanism. Hazardous area certification is also available.

These sensors are used in harsh industrial environments such as construction and fork lift vehicle safety monitoring, winch and crane position feedback, agricultural machinery, and flood management systems where robust waterproof extended stroke measurement equipment is required.

Posted on September 17, 2009 - (207 views)
Celesco Transducer Products Inc.
20630 Plummer Street
91311 Chatsworth - USA
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