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Chapter 9: Ultramount Weigh Modules
Sizing Weigh Modules
(
12/99) 9-1
9
Ultramount Weigh Modules
Ultramount weigh modules (5 to 100 kg) are designed for tanks, hoppers, and vessels
with smaller capacities. Two options are available for transferring weight from the top
plate to the load cell: a load pin for static loading applications such as tanks and a ball-
and-cup assembly for dynamic loading applications such as conveyors. All Ultramount
assemblies use stainless steel components and hardware. Each weigh module has five
basic components, which are shown in Figure 9-1.
Figure 9-1: Ultramount Weigh Module
Base Plate: This bottom plate is bolted or welded to the floor, foundation, or other
support structure to hold the weigh module in place.
Load Cell: This transducer uses a strain gauge to convert the mechanical force exerted
by the weight of a tank into an electric signal that provides a weight reading on an
indicator. The load cell is bolted to the weigh module’s base plate.
Load Pin: This pin fits into an opening in the underside of the top plate. It is used in
static loading applications to transfer weight from the top plate to a single point on the
load cell.
Ball and Cup: This assembly consists of upper and lower cups with a ball bearing
between them. It is used in dynamic loading applications to transfer weight from the top
plate to a single point on the load cell.
Load Pin
Top Plate
Load Cell
Base Plate
Ball and Cup
Hold-Down Bolts
- 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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