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METTLER TOLEDO Weigh Module Systems Handbook
(12/99)2-4
How to determine the load cell size needed for a conversion:
• Determine the
initial pull
force at the end of the transverse lever.
• Determine the weight of the existing weighbridge platform (
deadweight
).
• Determine the
capacity
of the existing scale.
• Determine the
multiple
of the lever system.
Insert the variables listed above into the following formula:
Deadweight of Platform Capacity
Multiple Multiple
Lever Replacement
A lever replacement eliminates the mechanical scale’s levers and dial head. The existing
weigh platform can be modified to accept compression weigh modules. This conversion
results in a fully electronic scale (see Figure 2-6).
Figure 2-6: Fully Electronic Scale
Load Cell Size = Initial Pull +
+
- Handbook 1
- Free Phone 0800 722 648 2
- FreeFax: 0800 722 649 2
- Phone: 09 262 1333 2
- Email: [email protected] 2
- Publication Revision History 3
- INTRODUCTION 4
- CHANGES WITHOUT NOTICE 4
- Contents 6
- Introduction 10
- Weigh Module Applications 12
- Conveyors 13
- Mechanical Scale 14
- Conversions 14
- Lever Replacement 15
- General Considerations 16
- Static versus Dynamic 17
- How Many Load Cells? 17
- Field Calibration 17
- Weighing System 18
- Performance 18
- Determining System 19
- Accuracy and Repeatability 19
- Calibration Errors 20
- Linearity Errors 21
- Hysteresis Errors 22
- Repeatability Errors 22
- What Kind of Accuracy Can 23
- You Expect in the Real 23
- (12/99) 3-9 24
- Resolution 25
- Industry Standards 26
- International Standards 29
- Environmental Considerations 32
- Wind Force 33
- Wind Loading 34
- Alternative Method 35
- Seismic Loading 36
- Factors Based on UBC 37
- Shock Loading 38
- Vibration 40
- Temperature Effects 40
- Moisture and Corrosion 41
- Lightning and Surge 42
- Protection 42
- Applying Force to Load 43
- Angular Loading 44
- Eccentric Loading 45
- Side and End Loading 45
- Tank and Vessel 46
- Provisions for Test Weights 47
- Structural Support 48
- Guidelines 48
- 1/4” max 49
- Weigh Module and Support 50
- Beam Alignment 50
- Stiffening Support 51
- Structures 51
- Structural Beam Support 52
- Structural Support Guidelines 53
- Tank Interaction 54
- Additional Vessel 55
- Restraint Methods 55
- Safety Rods 56
- Piping Design 57
- Example Calculation 59
- Piping Installation 60
- Electrical Wiring 63
- To Indicator 64
- Home Run Cables 66
- Top Plate 68
- Base Plate 68
- Load Cell 68
- Load Pin 68
- Hold-Down Bolt 68
- Selecting Material 69
- Weigh Module 70
- Orientation 70
- Flexmount HD Weigh Modules 75
- SECTION A-A 81
- General Procedure 86
- Ultramount Weigh Modules 90
- Installation 100
- Tension Weigh Modules 104
- Sizing Weigh Modules 105
- (12/99) 11-7 110
- Safety Wire Rope 110
- Calibration 112
- Indicators and Applications 114
- Weighing Accuracy 115
- Jaguar Indicator 116
- Lynx Indicator 116
- Panther Indicator 117
- Puma Indicator 117
- Applications 118
- Field Bus 119
- Processor PC Card I/0 120
- I/0 I/0 I/0 120
- Appendices 121
- Appendix 2: Design 122
- Qualification Form 122
- Appendix 3: Weigh 123
- Module Dimensions 123
- BOTTOM VIEW OF TOP PLATE 124
- Overload Gap 127
- 0.015 inch 127
- CAUTION 129
- Circular Tank with Four 130
- Weigh Modules 130
- Appendix 5: Load 132
- Ratings per Weigh 132
- Appendix 6: Flexmount 133
- Top Plate Travel 133
- Appendix 7: Load Cell 134
- Deflection 134
- 1° 47' 135
- Effective Thread 135
- Straight Thread 136
- Dimensions 136
- Appendix 9: Junction 137
- Box Dimensions and 137
- Wiring Diagrams 137
- WARNING 139
- W1, W2, W3, and W4 must be ON 142
- (shorting the pins) 142
- Appendix 10: NEMA/IP 143
- Enclosure Types 143
- Appendix 11: 148
- Engineering 148
- Specifications 148
- Flexmount HD Weigh 155
- Centerlign Weigh Modules 159
- Ultramount Weigh 164
- Value Line Weigh Modules 172
- Appendix 12: Chemical 181
- Resistance Chart 181
- (12/99)14-62 182
- Chapter 14: Appendices 183
- (12/99) 14-63 183
- (12/99)14-64 184
- (12/99) 14-65 185
- (12/99)14-66 186
- (12/99) 14-67 187
- (12/99)14-68 188
- (12/99) 14-69 189
- (12/99)14-70 190
- (12/99) 14-71 191
- Glossary 192
- Publication Suggestion Report 197
- ©1999 Mettler-Toledo, Inc 198
- Printed in USA 198
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