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Contents 3098 Technical Manual
Cont-6
Chapter 4 Accuracy considerations
4.1 Accuracy considerations......................................................................................................4-1
4.2 Calibration (for non-natural gas applications) ......................................................................4-4
4.2.1 Operation at low reference pressure levels ...........................................................4-4
Chapter 5 Maintenance and faultfinding
5.1 Introduction..........................................................................................................................5-1
5.1.1 Calibration check...................................................................................................5-1
5.1.2 Faultfinding............................................................................................................5-1
5.2 Maintenance........................................................................................................................5-4
5.2.1 Main meter (3098) removal ...................................................................................5-4
5.2.2 Density meter removal...........................................................................................5-6
5.2.3 Reference chamber diaphragm removal ...............................................................5-7
5.2.4 Re-assembly procedure ........................................................................................5-8
5.2.5 3098 filter change procedure.................................................................................5-8
5.2.6 Further servicing of the density meter ...................................................................5-9
5.2.7 Leak testing the 3098 ..........................................................................................5-10
5.2.8 Post maintenance tests .......................................................................................5-10
5.2.9 Worked example of calibration certificate ............................................................5-10
Chapter 6 Specification
6.1 3098 specification................................................................................................................6-1
6.1.1 Performance..........................................................................................................6-1
6.1.2 Electrical................................................................................................................6-1
6.1.3 Mechanical ............................................................................................................6-1
6.1.4 Safety ....................................................................................................................6-2
Appendix A Performance optimisation
A.1 Introduction......................................................................................................................... A-1
A.1.1 The density sensor ............................................................................................... A-1
A.1.2 The non-ideal behaviour of gases ........................................................................ A-1
A.1.3 Selection of reference chamber pressure............................................................. A-1
A.1.4 Selection of calibration gases............................................................................... A-2
A.2 Recommended calibration methods ................................................................................... A-2
A.2.1 General calibration method .................................................................................. A-2
A.2.2 Specific calibration method................................................................................... A-2
Appendix B Principles of operation
B.1 Theory – specific gravity measurement .............................................................................. B-1
Appendix C Returns forms