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3098 Technical Manual Contents
Cont-5
Contents
Chapter 1 Introduction
1.1 Specific gravity measurement ............................................................................................. 1-2
1.2 Functional description ......................................................................................................... 1-3
1.2.1 Meter sensing element.......................................................................................... 1-4
1.2.2 Installation.............................................................................................................1-4
1.3 Definition of terms ............................................................................................................... 1-5
1.3.1 Specific gravity (G)................................................................................................ 1-5
1.3.2 Standard (base or normal) density (ρ
s
).................................................................. 1-5
1.3.3 Relative density (ρ
r
)............................................................................................... 1-5
1.4 Physical properties of gas compounds................................................................................ 1-7
1.5 Applications......................................................................................................................... 1-8
1.5.1 Supplementary gas supply.................................................................................... 1-8
1.5.2 Wobbe index measurement .................................................................................. 1-8
1.5.3 Consumer gas costing .......................................................................................... 1-8
Chapter 2 Installation procedure
2.1 Installation procedure.......................................................................................................... 2-1
2.2 Contents.............................................................................................................................. 2-1
2.3 Installing the 3098 enclosure...............................................................................................2-1
2.3.1 Important precautions ........................................................................................... 2-1
2.3.2 Connections ..........................................................................................................2-2
2.4 Electrical connections and safety barriers / galvanic isolators............................................. 2-2
2.5 Reference chamber pressure determination ....................................................................... 2-2
2.6 Set-up procedure – purge cycling and calibration ............................................................... 2-4
2.7 Outline dimension drawings ................................................................................................ 2-7
Chapter 3 Electrical connections
3.1 Introduction ......................................................................................................................... 3-1
3.2 EMC cabling and earthing................................................................................................... 3-2
3.3 Certificate conditions for hazardous areas .......................................................................... 3-3
3.4 Use with Signal Converters and Flow Computers ...............................................................3-4
3.5 System connections (7950/7951/7955)............................................................................... 3-5
3.5.1 7950 2-wire configuration......................................................................................3-5
3.5.2 7950 3-wire configuration......................................................................................3-6
3.5.3 7951 2-wire configuration......................................................................................3-7
3.5.4 7951 3-wire configuration......................................................................................3-8
3.5.5 7955 2-wire configuration......................................................................................3-9
3.5.6 7955 3-wire configuration.................................................................................... 3-10
3.6 System connections (customer’s own equipment) ............................................................ 3-11
3.6.1 Non-hazardous areas.......................................................................................... 3-11
3.6.2 Hazardous areas................................................................................................. 3-11
3.6.3 Customer’s equipment, 2-wire configuration ....................................................... 3-12
3.6.4 Customer’s equipment, 3-wire configuration ....................................................... 3-13
3.7 Post-installation checks..................................................................................................... 3-14