사용자 설명서차례Specific gravity measurement1Functional description1Meter sensing element1Installation1Definition of terms1Specific gravity (G)1Standard (base or normal) density (ρs)1Relative density (ρr)1Physical properties of gas compounds1Applications1Supplementary gas supply1Wobbe index measurement1Consumer gas costing1Installation procedure2Contents2Installing the 3098 enclosure2Important precautions2Connections2Electrical connections and safety barriers / galvanic isolators2Reference chamber pressure determination2Set-up procedure – purge cycling and calibration2Outline dimension drawings2Introduction3EMC cabling and earthing3Certificate conditions for hazardous areas3Use with Signal Converters and Flow Computers3System connections (7950/7951/7955)37950 2-wire configuration37950 3-wire configuration37951 2-wire configuration37951 3-wire configuration37955 2-wire configuration37955 3-wire configuration3System connections (customer’s own equipment)3Non-hazardous areas3Hazardous areas3Customer’s equipment, 2-wire configuration3Customer’s equipment, 3-wire configuration3Post-installation checks3Accuracy considerations4Calibration (for non-natural gas applications)4Operation at low reference pressure levels4Introduction5Calibration check5Faultfinding5Maintenance5Main meter (3098) removal5Density meter removal5Reference chamber diaphragm removal5Re-assembly procedure53098 filter change procedure5Further servicing of the density meter5Leak testing the 30985Post maintenance tests5Worked example of calibration certificate53098 specification6Performance6Electrical6Mechanical6Safety6크기: 774킬로바이트페이지: 78Language: English매뉴얼 열기