OHAUS DEFENDER SERIES, Service Manual

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i Defender
™ Series Bases Service Manual
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION ............................................................................................................................ 2
1.1 Introduction ............................................................................................................................................ 2
1.2 Definition of Signal Warning and Symbols ............................................................................................ 2
1.3 Safety Precaution .................................................................................................................................. 3
1.4 Service Facilities ................................................................................................................................... 3
1.5 Tools and Test Equipment Required ..................................................................................................... 4
1.6 Test Masses Required .......................................................................................................................... 4
1.7 Service Strategy .................................................................................................................................... 4
1.8 Physical Description: Model Defender Series Base .............................................................................. 4
1.9 Specifications ........................................................................................................................................ 5
1.10 How Load Cells Operate ....................................................................................................................... 9
1.11 Load Cell Connection .......................................................................................................................... 10
CHAPTER 2 TROUBLESHOOTING .................................................................................................................. 12
2.1 Troubleshooting ................................................................................................................................... 12
2.1.1 Checking Load Cells for Trouble ..................................................................................................... 12
CHAPTER 3 MAINTENANCE AND REPAIR PROCEDURES .......................................................................... 13
3.1 Preventive Maintenance ...................................................................................................................... 13
3.1.1 Preventive Maintenance Checklist .............................................................................................. 13
3.2 Replacing the Load Cell ...................................................................................................................... 13
3.3 Overload Stop Adjustment .................................................................................................................. 14
CHAPTER 4 TESTING ...................................................................................................................................... 17
4.1 Testing ................................................................................................................................................. 17
4.2 Load Cell Resistance Checks ............................................................................................................. 17
4.3 Calibration with an External Indicator .................................................................................................. 17
4.4 Consistency Check .............................................................................................................................. 18
4.5 Performance Tests .............................................................................................................................. 18
4.5.1 Off Center Load (Shift) Test ............................................................................................................ 19
4.5.2 Adjusting Off Center Load ............................................................................................................... 20
4.5.3 Full Load Test .................................................................................................................................. 21
CHAPTER 5 PARTS IDENTOFICATION ........................................................................................................... 22
5.1 Defender series Base: Carbon Steel model ........................................................................................ 22
5.2 Defender series Base: Stainless Steel model ..................................................................................... 24
APPENDIX A. GLOSSARY ................................................................................................................................ 26