Page 3 - Contents; Chapter 1
Installation and Configuration Manual i Contents Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Safety guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Specific g...
Page 4 - Chapter 4
ii Micro Motion 3098 Gas Specific Gravity Meter Contents Chapter 4 Accuracy Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 4.1 Accuracy considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294.1.1 Example 1 . . . ...
Page 7 - In; Safety guidelines; Handle the 3098 specific gravity meter with great care.; For technical details, please refer to the system installer.
Installation and Configuration Manual 1 Installa tion Pr ocedur e A ccurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Chapter 1 Introduction This chapter contains an outline of how the 3098 specific gravity meter works, defines some of the terms commonly used in the manual, and als...
Page 8 - Introduction; Specific gravity measurement
2 Micro Motion 3098 Gas Specific Gravity Meter Introduction 1.2 Specific gravity measurement Most major gas flow metering systems require the metered quantity to be presented in heat or standard volume units. To achieve this requirement, it is often necessary to make continuous and accurate measurem...
Page 9 - Functional description
Installation and Configuration Manual 3 Introduction Installa tion Pr ocedur e A ccurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on 1.3 Functional description Figure 1-2 Schematic diagram of a typical 3098 specific gravity measuring system The 3098 specific gravity meter consists of...
Page 10 - Meter sensing element
4 Micro Motion 3098 Gas Specific Gravity Meter Introduction If the sample gas pressure rises above that of the reference chamber pressure, the pressure control valve opens to vent the excess gas via an outlet orifice in the enclosure side, so that the sample gas pressure is reduced to equal the refe...
Page 11 - Typical 3098 specific gravity measuring system
Installation and Configuration Manual 5 Introduction Installa tion Pr ocedur e A ccurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Figure 1-3 Typical 3098 specific gravity measuring system 1.4 Definition of terms 1.4.1 Specific gravity Specific gravity (G) is the ratio of the molec...
Page 12 - ) is the absolute density of a gas at standard (base or normal); Relative density; taken under identical conditions of temperature and pressure.
6 Micro Motion 3098 Gas Specific Gravity Meter Introduction 1.4.2 Standard (base or normal) density Standard (base or normal) density ( ρ s ) is the absolute density of a gas at standard (base or normal) conditions of temperature and pressure and is commonly used for standard volumne flow determinat...
Page 13 - Physical properties of gas compounds; Compound
Installation and Configuration Manual 7 Introduction Installa tion Pr ocedur e A ccurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on 1.5 Physical properties of gas compounds 1.6 Applications The following are typical applications where specific gravity measurement is an essential par...
Page 14 - Wobbe index measurement
8 Micro Motion 3098 Gas Specific Gravity Meter Introduction 1.6.2 Wobbe index measurement The burning characteristic of a gas must be well established for efficient combustion and to ensure that no flame lift or flame light-back occurs on a particular burner. Three criteria are used to establish thi...
Page 15 - Installa; Chapter 2; Installation procedure
Installation and Configuration Manual 9 Installa tion Pr ocedur e Accurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Chapter 2 Installation Procedure 2.1 Installation procedure The procedure for installing the 3098 involves the following steps: 1. Check all components are present (...
Page 16 - Installation Procedure; Connections; Each connection is labelled.; Coalescing filter
10 Micro Motion 3098 Gas Specific Gravity Meter Installation Procedure The 3098 specific gravity meter is contained inside an IP-rated enclosure (which provides thermal insulation) and a mounting system (consisting of a bracket and feet) to fix the unit in place. While this structure is designed to ...
Page 17 - Reference chamber pressure determination; The span of specific gravity to be measured; C versus reference chamber pressure
Installation and Configuration Manual 11 Installation Procedure Installa tion Pr ocedur e Accurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on 2.5 Reference chamber pressure determination Once the 3098 specific gravity meter has been placed in its fixture and all relevant pipework an...
Page 18 - Set-up procedure – purge cycling and calibration; Open valve A and allow gas to flow for 3 minutes.; contact the factory using the details on the back page.
12 Micro Motion 3098 Gas Specific Gravity Meter Installation Procedure 2.6 Set-up procedure – purge cycling and calibration Figure 2-2 Schematic diagram of a typical 3098 specific gravity measuring system The procedure for purging and calibrating the 3098 specific gravity meter is given below (see F...
Page 19 - Purge cycling; SG
Installation and Configuration Manual 13 Installation Procedure Installa tion Pr ocedur e Accurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Purge cycling 10. Close valve C. 11. When Control Pressure Indicator is at the desired value, shut valve A and open valve F. Allow the gas to...
Page 20 - Outline dimensional drawings
14 Micro Motion 3098 Gas Specific Gravity Meter Installation Procedure 27. Shut valve B and disconnect the second calibration gas bottle from pipework. 28. Open the isolation valve D. 29. Open valve A. 2.7 Outline dimensional drawings Figure 2-3 shows a 3098 specific gravity meter without an enclosu...
Page 21 - 098 specific gravity meter without an enclosure
Installation and Configuration Manual 15 Installation Procedure Installa tion Pr ocedur e Accurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Figure 2-3 3098 specific gravity meter without an enclosure Dimensions in inches (mm) ∅ 12.4 (314) ∅ 8 (203 .2) 4.4 (112) 17.4 (442 ) 11 .3 (...
Page 22 - 098 specific gravity meter with a small enclosure
16 Micro Motion 3098 Gas Specific Gravity Meter Installation Procedure Figure 2-4 3098 specific gravity meter with a small enclosure 20.3 (516) 19.7 (500) 12 (300) 1.2 (30) 1 / 3 (8.5) 20.3 (516 ) 17.1 (423) 17.1 (423 ) 19.7 ( 5 00) Dimensions in inches (mm)
Page 23 - 098 specific gravity meter with a large enclosure
Installation and Configuration Manual 17 Installation Procedure Installa tion Pr ocedur e Accurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Figure 2-5 3098 specific gravity meter with a large enclosure 24.3 (616) 23.6 (600) 12 (300) 1.2 (30) 1 / 3 (8.5) 32.1 (816 ) 20.6 (523) 28.5...
Page 25 - ons; Chapter 3; The meter terminal layout is shown in Figure 3-1.; Main terminal board connections
Installation and Configuration Manual 19 Installa tion Pr ocedur e A ccurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Chapter 3 Electrical Connections This chapter contains details and wiring diagrams for connecting the 3098 specific gravity meter to 7950/51 signal converters and ...
Page 26 - Electrical Connections; Interconnection diagram
20 Micro Motion 3098 Gas Specific Gravity Meter Electrical Connections Figure 3-2 Interconnection diagram 3.2 EMC cabling and earthing To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the meter be connected using a suitable instrumentation cable and earthed th...
Page 27 - Use with signal converters and flow computers
Installation and Configuration Manual 21 Electrical Connections Installa tion Pr ocedur e A ccurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Figure 3-3 Schematic block diagram of meter circuit (2-wire system) Figure 3-4 Schematic block diagram of meter circuit (3-wire system) 3.4 ...
Page 29 - Hazardous Area; Barrier trip level switch settings
Installation and Configuration Manual 23 Electrical Connections Installa tion Pr ocedur e A ccurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Figure 3-7 7950 signal converter and gas specific gravity 2-wire system with galvanic isolator (hazardous area) Note: When the ATEX/IECEx-ap...
Page 30 - Note: The barrier trip level switch should be set to 3 volts.; Meter
24 Micro Motion 3098 Gas Specific Gravity Meter Electrical Connections Figure 3-9 7950 signal converter and gas specific gravity 3-wire system with shunt-diode safety barrier (hazardous area) Figure 3-10 7950 signal converter and gas specific gravity 3-wire system with galvanic isolator (hazardous a...
Page 33 - System connections (customer’s own equipment); Power supply to PRT: 5 mA maximum; Hazardous areas
Installation and Configuration Manual 27 Electrical Connections Installa tion Pr ocedur e A ccurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on 3.6 System connections (customer’s own equipment) 3.6.1 Non-hazardous areas Power supply to Density Meter: 15.5 to 33 Vdc, < 20 mA. Power...
Page 34 - Post-installation checks; 0 mA at 24 V dc input (Nominal input current)
28 Micro Motion 3098 Gas Specific Gravity Meter Electrical Connections 3.6.4 Customer's equipment, 3-wire configuration Figure 3-19 Electrical connections for meter 3-wire option used with customer’s own equipment (safe area) Figure 3-20 Electrical connections for meter 3-wire option used with custo...
Page 35 - Accurac; Accuracy considerations; Example 1
Installation and Configuration Manual 29 Installa tion Pr ocedur e Accurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Chapter 4 Accuracy Considerations This chapter provides a method for estimating the accuracy of 3098 specific gravity meter measurements under various conditions. 4...
Page 36 - Accuracy Considerations; Calculating parameters; Calculated using equation:; Density meter temperature coefficient error; Temperature coefficient from calibration certificate = x kgm; Gas compressibility error; 098 Specific Gravity Meter Control Pressure Selection; to P
30 Micro Motion 3098 Gas Specific Gravity Meter Accuracy Considerations 4.1.3 Calculating parameters Density range at 20°C Calculated using equation: Density meter temperature coefficient error Inversely proportional to density (therefore pressure) and is calculated as follows: Temperature coefficie...
Page 37 - mix
Installation and Configuration Manual 31 Accuracy Considerations Installa tion Pr ocedur e Accurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Installa tion Pr ocedur e Accurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Installa tion Pr ocedur e Accurac y Cons ider...
Page 38 - For more specific details on calibration see Appendix A.; Operation at low reference pressure levels
32 Micro Motion 3098 Gas Specific Gravity Meter Accuracy Considerations With this decided, the 3098 specific gravity meter can be calibrated by following the calibration procedure described in Section 2.6. Note: In the case where only one calibration gas is available, the time period of the density ...
Page 39 - Calibration certificate example; 098 Calibration Certificate; INPUTS
Installation and Configuration Manual 33 Accuracy Considerations Installa tion Pr ocedur e Accurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Installa tion Pr ocedur e Accurac y Cons idera tions Electrical Co nnecti ons In tr o ducti on Installa tion Pr ocedur e Accurac y Cons ider...
Page 41 - Spec; Chapter 5; Instrument over-reads
Installation and Configuration Manual 35 Spec ification Main tenance and F a u lt Fi nding Chapter 5 Maintenance and Fault Finding 5.1 Introduction This chapter deals with the recommended servicing and maintenance that can be carried out under field conditions, including calibration checks, fault-fi...
Page 42 - Maintenance and Fault Finding; Instrument under-reads
36 Micro Motion 3098 Gas Specific Gravity Meter Maintenance and Fault Finding 5.3.2 Instrument under-reads This is most probably due to a gas leak from the reference chamber. Before dismantling the instrument it is desirable to locate the leak, the cause of which may be one of the following: (i) Ref...
Page 43 - Maintenance; gas and electrical supplies.
Installation and Configuration Manual 37 Maintenance and Fault Finding Spec ification Main tenance and F a u lt Fi nding If the erratic signal is only present while there is a flow of sample gas through the unit, then the fault is likely to be due to a malfunction of the pressure control valve, brou...
Page 44 - from their fittings. Take the metalwork to a clean area.
38 Micro Motion 3098 Gas Specific Gravity Meter Maintenance and Fault Finding 5.4.1 Main meter (3098 specific gravity meter) removal (Figure 5-1) The instructions in this section apply only to 3098 specific gravity meters supplied with an enclosure (see Safety guidelines on page 1). In all other cas...
Page 45 - Density meter exploded view
Installation and Configuration Manual 39 Maintenance and Fault Finding Spec ification Main tenance and F a u lt Fi nding Figure 5-1 3098 specific gravity meter general assembly schematic (typical enclosure) 5.4.2 Density meter removal (Figure 5-2) 1. With the 3098 specific gravity meter disconnected...
Page 46 - Do not try to lever the unit out – this; Reference chamber diaphragm section; unit feet and stand the metalwork upright.
40 Micro Motion 3098 Gas Specific Gravity Meter Maintenance and Fault Finding 2. Use two of the removed M6 bolts to jack the meter from its housing using the two threaded holes found in the mounting housing (item 6). WARNING! Do not try to lever the unit out – this will damage the sealing O-ring and...
Page 47 - base plate to the reference chamber.; Re-assembly procedure
Installation and Configuration Manual 41 Maintenance and Fault Finding Spec ification Main tenance and F a u lt Fi nding 4. Gently rest the 3098 specific gravity meter on its side and undo the six M6 bolts that lock the base plate to the reference chamber. Note: Care must be taken not to bend or dam...
Page 48 - in an appropriate solvent.; Spoolbody/cylinder alignment; of the cyclinder and its housing. Hold only by the clamping section.
42 Micro Motion 3098 Gas Specific Gravity Meter Maintenance and Fault Finding 6. Re-assembly is the reverse of steps 2 and 1 above. Note: Once the unit has been replaced into its enclosure, a leak check must be performed before on-line operation. 5.4.6 Further servicing of the density meter (Figure ...
Page 49 - Leak testing the 3098 specific gravity meter; Reference chamber leaks; Post-maintenance tests; This example relies on the following criteria being assumed:
Installation and Configuration Manual 43 Maintenance and Fault Finding Spec ification Main tenance and F a u lt Fi nding 5.4.7 Leak testing the 3098 specific gravity meter Leaks incurred during servicing can be categorized under two main headings: • Reference chamber leaks a. Charge the reference ch...
Page 51 - Chapter 6; 098 specific gravity meter specifications; Specification
Installation and Configuration Manual 45 Spec ification Main tenance and F a u lt Fi nding Chapter 6 Specifications 6.1 3098 specific gravity meter specifications Note: Some parts of this specification (marked with *) cannot be guaranteed for 3098 specific gravity meters supplied without an IP-rated...
Page 52 - Specifications; Electrical; Mechanical specifications
46 Micro Motion 3098 Gas Specific Gravity Meter Specifications 6.1.2 Electrical 6.1.3 Mechanical 6.1.4 Safety For ATEX/IECEx installations, see the ATEX/IECEx Safety Instructions booklet and PED Safety Instructions booklet (available at www.micromotion.com). For CSA installations, see Appendix D. Ta...
Page 53 - rf; Appendix A
Installation and Configuration Manual 47 Principles of Ope ration C ertifie d Syste m D ra w ings Retu rn P o li c y P e rf orma nce Optimization Appendix A Performance Optimization A.1 Introduction The 3098 specific gravity meter uses a vibrating element density sensor that is located within a pres...
Page 54 - Performance Optimization; The non-ideal behaviour of gases; To minimize Z changes with temperature, use low pressure.; Selection of calibration gases
48 Micro Motion 3098 Gas Specific Gravity Meter Performance Optimization A.1.2 The non-ideal behaviour of gases This behaviour will affect the operation of the measurement system since the measurement of density at the operating condition is not only related to the relative density of the gas but al...
Page 55 - The reference chamber pressure is selected as follows:
Installation and Configuration Manual 49 Performance Optimization Principles of Ope ration C ertifie d Syste m D ra w ings Retu rn P o li c y P e rf orma nce Optimization A.2 Recommended calibration methods From the previous descriptions it can be appreciated that there is a choice of calibration pr...
Page 56 - Velocity of sound effect; The velocity of sound effect on the sensor is such that:
50 Micro Motion 3098 Gas Specific Gravity Meter Velocity of sound effect The velocity of sound effect on the sensor is such that: The velocity of sound in a gas can be determined as follows: For an ideal gas at 20°C, equation A2 can be simplified to: Therefore, substituting into equation A1 and simp...
Page 57 - Compressibility factor; The normal or base density (
Installation and Configuration Manual 51 Performance Optimization Principles of Ope ration C ertifie d Syste m D ra w ings Retu rn P o li c y P e rf orma nce Optimization Compressibility factor The normal or base density ( ρ s ) is given by the equation: The basic operation of the instrument allows ...
Page 58 - Combination of V
52 Micro Motion 3098 Gas Specific Gravity Meter Performance Optimization The Z factors of the calibration gases and the sample gases should be calculated at both base and operating conditions in order to establish the compressibility factor V F and then tabulated as shown by the example in Table A-2...
Page 59 - Legend for Table A1; Column
Installation and Configuration Manual 53 Performance Optimization Principles of Ope ration C ertifie d Syste m D ra w ings Retu rn P o li c y P e rf orma nce Optimization Legend for Table A1 Summary This appendix describes the major systematic errors of the 3098 specific gravity meters and methods o...
Page 60 - Tabl
54 Micro Motion 3098 Gas Specific Gravity Meter Performance Optimization Tabl e A -1 At ba se c ondit ion s A t sa m p le g as co nditions of ° C and bar s 1 Ga s ty pe 2 M o le cula r mass M (1 ) (1) C olumn 2 da ta derived fr om p a g e x.x or other suitable tables. 3 γ at sa mple c o ndit ions (2...
Page 61 - le
Installation and Configuration Manual 55 Performance Optimization Principles of Ope ration C ertifie d Syste m D ra w ings Retu rn P o li c y P e rf orma nce Optimization Ta b le A -2 At ba se c ondit io n s A t sa mple gas c ondition s of ° C and bar s 1 G as ty p e 2 M o le cula r mass M (1 ) (1) ...
Page 62 - Example Calculations
56 Micro Motion 3098 Gas Specific Gravity Meter Performance Optimization Example Calculations Column 5 Methane Nitrogen Sample A Sample B Sample C Column 6 Methane Nitrogen Sample A Sample B Sample C Column 7 Methane = 1+7(0.00017+6E–5x16.04–1.13E–5x16.04²+0)= 0.9876 Nitrogen 1 – 0.000238 x 7 = 0.99...
Page 65 - Illustration of example condition
Installation and Configuration Manual 59 Performance Optimization Principles of Ope ration C ertifie d Syste m D ra w ings Retu rn P o li c y P e rf orma nce Optimization Alternative simplified method of deriving modified values of Y (the nitrogen SG value used for calibration) to produce a nil erro...
Page 67 - of Ope; Appendix B; Theory of specific gravity measurement; Now let the density of the gas sample measured be
Installation and Configuration Manual 61 Principles of Ope ration Cer tifi e d System Dra w ing s Retu rn P o li c y P e rf orma nce Optimization Appendix B Principles of Operation B.1 Theory of specific gravity measurement By definition: The relative density is numerically equal to specific gravity...
Page 68 - Principles of Operation
62 Micro Motion 3098 Gas Specific Gravity Meter Principles of Operation Since conditions of constant volume and quantity exist for the reference gas, its density and molecular weight are constant and from equation 5. If now the two gases can be maintained at the same temperature, from equations 4 an...
Page 69 - Retu; Appendix C; General guidelines; , or by phoning the Micro Motion Customer Service department.; New and unused equipment
Installation and Configuration Manual 63 Principles of Ope ration C ertifie d Syste m D ra w ings Retu rn P o li c y P e rf orma nce Optimization Appendix C Return Policy C.1 General guidelines Micro Motion procedures must be followed when returning equipment. These procedures ensure legal complianc...
Page 70 - Return Policy
64 Micro Motion 3098 Gas Specific Gravity Meter Return Policy
Page 71 - Cer; Appendix D; General; Drawing reference
Installation and Configuration Manual 65 Principles of Ope ration Cer tifi e d System Dra w ing s Retu rn P o li c y P e rf orma nce Optimization Appendix D Certified System Drawings D.1 General All certified drawings in this manual are given here for planning purposes only. Before commencing with i...
Page 72 - Certified System Drawings
66 Micro Motion 3098 Gas Specific Gravity Meter Certified System Drawings Figure D-1 CSA system drawing, gas groups A, B, C, and D (2-wire option) shunt diode barrier
Page 78 - Micro Motion Inc. USA; Worldwide Headquarters; Micro Motion Europe
Micro Motion Inc. USA Worldwide Headquarters 7070 Winchester CircleBoulder, Colorado 80301T +1 303-527-5200+1 800-522-6277 F +1 303-530-8459 Micro Motion Europe Emerson Process ManagementNeonstraat 16718 WX EdeThe NetherlandsT +31 (0) 318 495 555 F +31 (0) 318 495 556 Micro Motion Japan Emerson Proc...
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