Due to the effects of the use and the environment and the device aging on belt scale,the accuracy may change.According to state regulations require periodic testing measurement technology.Without the test or exceed the effective date of the test on belt scale can not be used.

Belt scale is designed specifically for continuous measurement of bulk materials.It is based on the lever principle,and to install the lever device below the continuous running belt,the lever bearing surface is several roller devices,to meet the measurement error which is caused to reducing friction between the belt and the bearing surface when the belt run through.Meanwhile the measurement section also get rid of  the traditional weight device,and use the resistance strain weighing sensor to measure.

When the materials on the belt go through the bearing surface of the lever device,it will produce a certain pressure on the bearing surface,the pressure is transmitted through the lever device to the weighing sensor,after the control device magnifies the weight pressure signal of the weighing sensor,then display in digital form.

Meanwhile it can do external human control on display digital signal,make belt scale automatic change the speed of the belt according to the actual requirements of feeding,tracing to the given feed quantity,thus forming control characteristic that when the feeding is more,the speed is slow;when the feedingis less,the speed is faster;when there is no feeding,the speed is fastest;and when overloading,the speed is slowest and even stop.

Though when there is no material above the belt,the speed is the fastest,it is not unlimited fast,the belt can not be directly run by the belt motor.Therefore,different feeding rates need to use different reduction mechanism to control the fastest speed of the belt.