The overall tension in the system is controlled by a spring mechanism against an idler wheel. Some form of load measurement was required, but it had to fit into the existing system, which did not allow space for a standard off-the-shelf load cell.
Applied Measurements Ltd designed and manufactured a custom load cell based on the CCG load cell concept, but to exactly fit the existing mechanical dimensions. It had to be annular to allow the tensioning system to fit through the centre and to be extremely low in height to replace an existing washer.
To complete the system each load cell was supplied calibrated with a digital indicator containing 4 changeover relays. Each system operated from a 240Vac supply, giving the system operators a visual reference of the tension in the system, plus the relays controlled an early warning alarm system allowing preventative maintenance.
