Mettler Toledo LJ16 Spécifications télécharger pdf (Page 6)

Contents

Introduction .......................................................................................................1-1

Compression Weigh Modules .............................................................................................. 1-1

Tension Weigh Modules ...................................................................................................... 1-2

Weigh Module Applications.................................................................................2-1

Tanks, Hoppers, and Vessels ............................................................................................... 2-1

Conveyors.......................................................................................................................... 2-2

Mechanical Scale Conversions ............................................................................................ 2-3

Lever Conversion................................................................................................................. 2-3

Lever Replacement...............................................................................................................2-4

General Considerations ......................................................................................3-1

Compression versus Tension Load Cells............................................................................... 3-1

Static versus Dynamic Loading ............................................................................................ 3-2

How Many Load Cells?........................................................................................................ 3-2

Field Calibration................................................................................................................. 3-2

Weighing System Performance............................................................................................ 3-3

Determining System Accuracy and Repeatability ...................................................................... 3-4

What Kind of Accuracy Can You Expect in the Real World?........................................................ 3-8

Determining System Resolution............................................................................................ 3-10

Industry Standards............................................................................................................ 3-11

United States Standards ...................................................................................................... 3-11

International Standards....................................................................................................... 3-14

Environmental Considerations............................................................................. 4-1

Wind Loading ..................................................................................................................... 4-1

Example............................................................................................................................. 4-3

Alternative Method ............................................................................................................... 4-4

Seismic Loading .................................................................................................................4-5

UBC Code Formulas............................................................................................................. 4-5

Factors Based on UBC Code............................................................................................. 4-6

Shock Loading .................................................................................................................... 4-7

Vibration............................................................................................................................ 4-9

Temperature Effects ............................................................................................................ 4-9

Moisture and Corrosion..................................................................................................... 4-10

Lightning and Surge Protection.......................................................................................... 4-11

General Installation Guidelines ...........................................................................5-1

Applying Force to Load Cells ............................................................................................... 5-1

Angular Loading.................................................................................................................. 5-2

Eccentric Loading ................................................................................................................ 5-3

Side and End Loading .......................................................................................................... 5-3

Torsional Loading................................................................................................................ 5-4

Tank and Vessel Design ...................................................................................................... 5-4

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Mettler Toledo LJ16 Spécifications Page 6