By K. Elis Norden

This booklet describes the basic rules of digital weighing, starting with the theoretical heritage of the elemental elements and carrying on with with the theoretical formulation to calculate the weighing accuracy in numerous functions, together with the effect on accuracy of exterior irritating forces. It additionally describes the format and optimal composition of weighing platforms for static weighing and batching, in-motion weighing, belt conveyor weighing and stream regulate, in addition to counting and checkweighing scales. entire technical requisites are incorporated, which, supplemented with suitable technical info, can function masters for procurment of the gear for twelve average business weighing functions. trying out ideas and strategies for try experiences are certain, overlaying all types of static weighing and batching platforms, in addition to belt conveyor scales and dosimeters. Written for practitioners, this e-book will supply engineers and executives within the chemical, iron and metal, pulp and paper and different industries an understanding of the elemental know-how, an appreciation of the variety of its software, and an knowing of the functionality that may be anticipated.

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Extra resources for Handbook of Electronic Weighing

Sample text

I. a weigh bridge, or dimensional changes of a tank or hopper due to internal pressure etc. In practice there are usually three methods currently employed to protect compression load cells from transverse forces: (1) (2) (3) Self-aligning compression load cells, allowing the load cell to pivot. Self-aligning pivoting force transfer pieces. Rubber or plastic pads between the load carrier and the load cell, allowing lateral movement with reduction of the transverse force. In all these three methods the weighing object (bridge, hopper etc) is floating freely in the horizontal plane, and the movement will have to be limited by bumpers.

36 below. The load cells are assembled in a connection box in the hook assembly and through a vertical cable, with a snatching device to provide Load cell desigrts and installation principles 65 cable load relief and prevent the cable from breaking, connected to a slipring-less cable drum in the travelling crab. The reason for a slipringless cable drum is that eventual variation in contact resistance from sliprings connected in series with the load cell bridge circuit would be hazardous to the weighing accuracy.

Angular displacement of the mounting brackets. Horizontal external forces acting on the hopper or tank. Force shunts through pipe connections. In addition to this the sources of error caused by restraining elements, such as beam flexures or stay rods, are equally important and have to be given greatest attention. 1 Vertical deflection of the supporting structure. Vertical deflection of the supporting structure causes the same problems with hopper and tank installations as it does in weighbridge installations, and generally the same precautions have to be taken to reduce the effects.

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