Two factors affect Sensor Sizing. The sensor must be able to measure the Force (F) created by the Web Tension (T) wrapping the roll at given angle. The sensor must also support the tare weight of the sensing roll and bearings. These two factors are independent of one another and must be calculated separately.
F=2T • cos A/2
Load range per sensor (see specifications) is F divided by the number of points supporting the load, i.e. two support points in Bilateral, Unilateral or Cantilevered configuration, or one support point in Narrow Web or
F=(T • cosX) + (T • cosY)
Wire and Filament configuration below. Tare per sensor (see specifications) is calculated the same way. The tare per sensor is the total weight of the sensor roll and the bearings divided by the number of support points.