The ArchWeigh's dual-ended load cells take advantage of the natural tendency for the frame to twist in the direction of belt travel. The frame equally forces one end of the load cell down and the other up, zeroing out the effects of the idler's movement and allowing an accurate measurement of the material on the belt. Other systems merely compensate for the motion. The ArchWeigh SC provides excellent in-motion accuracy in an affordable package. The ArchWeigh HP offers ±½% accuracy using factory balanced and leveled construction with machined idler rolls.ArchWeigh's Unique Design To be accurate, any in-motion weighing system must be able to compensate for the force generated by the radial motion of the idler. This force is the result of the movement of the material passing over the scale, not the weight of the material