Emerson 3098 Benutzerhandbuch
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