When a major UK-based structural health monitoring systems company were called in to urgently evaluate problematic expansion joints on a reinforced concrete motorway bridge, they required not just an extremely fast delivered solution for several linear displacement sensors but also a combined accuracy, temperature stability and environmental specification that would be beyond the capabilities of most suppliers. Compounded by such restraints they contacted Positek Limited who pulled out the stops and within a oneweek timescale delivered around forty custom-built sensors featuring a unique differential coil design with electronic temperature compensation and full IP68 protection. Based on Positek’s PIPS™ non-contacting sensor
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