Manuels d'utilisation pour Emerson 3098

Table des matières

• Specific gravity measurement

  1
• Functional description

  1
• Meter sensing element

  1
• Installation

  1
• Definition of terms

  1
• Specific gravity (G)

  1
• Standard (base or normal) density (ρs)

  1
• Relative density (ρr)

  1
• Physical properties of gas compounds

  1
• Applications

  1
• Supplementary gas supply

  1
• Wobbe index measurement

  1
• Consumer gas costing

  1
• Installation procedure

  2
• Contents

  2
• Installing the 3098 enclosure

  2
• Important precautions

  2
• Connections

  2
• Electrical connections and safety barriers / galvanic isolators

  2
• Reference chamber pressure determination

  2
• Set-up procedure – purge cycling and calibration

  2
• Outline dimension drawings

  2
• Introduction

  3
• EMC cabling and earthing

  3
• Certificate conditions for hazardous areas

  3
• Use with Signal Converters and Flow Computers

  3
• System connections (7950/7951/7955)

  3
• 7950 2-wire configuration

  3
• 7950 3-wire configuration

  3
• 7951 2-wire configuration

  3
• 7951 3-wire configuration

  3
• 7955 2-wire configuration

  3
• 7955 3-wire configuration

  3
• System connections (customer’s own equipment)

  3
• Non-hazardous areas

  3
• Hazardous areas

  3
• Customer’s equipment, 2-wire configuration

  3
• Customer’s equipment, 3-wire configuration

  3
• Post-installation checks

  3
• Accuracy considerations

  4
• Calibration (for non-natural gas applications)

  4
• Operation at low reference pressure levels

  4
• Introduction

  5
• Calibration check

  5
• Faultfinding

  5
• Maintenance

  5
• Main meter (3098) removal

  5
• Density meter removal

  5
• Reference chamber diaphragm removal

  5
• Re-assembly procedure

  5
• 3098 filter change procedure

  5
• Further servicing of the density meter

  5
• Leak testing the 3098

  5
• Post maintenance tests

  5
• Worked example of calibration certificate

  5
• 3098 specification

  6
• Performance

  6
• Electrical

  6
• Mechanical

  6
• Safety

  6