Gas Density & Specific Gravity Products - P & MIP

1 Density MEASUREMENTGas Density & Specific Gravity ProductsSolartron s 7812 and 3098transducers bring you all thebenefits of highly accurate,continuous on-line measurements ofgas Density and gas Specific Gravity : Better control of product quality Faster response to changing conditions Reduced waste Improved safety Greater profitability Overcomes disadvantages oftraditional sampling techniquesThe 7812 technology is unique in providing on-line,continuous Density measurements. It offers: Highest accuracy and resolution available today Fast reaction to process changes Low maintenance requirement In-situ replacement of filters Approved for custody transfer The 7812 is based on a resonating cylinder: the Density of the gas flowing through the transducer changes the naturalresonant frequency of the cylinder.

2 By maintaining thisvibration and measuring its frequency electronically, thedensity of the gas (which is directly related to mass flow) can be of the 7812 include Fiscal gas Density measurement to ISO 5167 and AGA 3 standards Gas blending Direct measurement of ethylene density7812 SpecificationDensity range1-400kg/m3( )Limits of error (10 to 100% )for nitrogen of readingfor natural gas, ethylene of readingMaximum operating pressure150 bar, 2175 psi (using weldolet kit);250 bar, 3625 psi (using pocket kits)Temperature range-20 to +85 C (-4 to +185 F)Temperature C ( F)Process gasMust be dry and compatible withNi-spanC902, Stainless Steel AISI 316,Stycast Catalyst 11 and Permendur IronIntegral temperature measurementPT100 class ATemperature accuracyBetter than C Mechanical featuresSample gas connectionIntegral filters2 micron (inlet); 90 micron (outlet)Weight5kg (11Ib)Max.

3 DimensionsMaterials of constructionMain housing316L stainless steelLinerAMS 5643 KCylinderNi-Span CAmplifier housingDie cast low copper alloyPolyurethane paintElectrical featuresPower supply+ to 33 VDC, 25mAOutput signal1960 Hz 10% at 0kg/m3(0lb/ft3)1580 Hz 10% at 60kg/m3( )Nominal 6V pk to pk for 3 wire systemNominal 2-3V pk to pk across 330 resistor for 2 wire systemApprovalsSafetyCENELEC EN 50020 EEx ia IIC T6(Ex90C2346 and Ex90C2347)EMCBS EN50081-2: 1994BS EN50082-2: 1995 Ordering information7812X X XInstallation kitAPocket Kit ASTM A350LF2 P/N 78109 ABWeldolet P/N 78109 BHExternal Pocket P/N 78109 HLPocket ASTM 316L P/N 78109lXNone7812 Gas Density TransducerOn-line forimproved accuracy,reliability O ring typeAVitonBEPC alibrated range1 Range 5-90kg/m33 Range 25-250kg/m34 Range 40-400kg/m31/4" NPT (API) female364 x 139mm (141/2" x 51/2")The 3098 is the latest development in a product line well established as the industry standard for gasgravitometers.

4 It is the only product that offerscontinuous on-line measurements as well as: Highest accuracy and resolution available today Fast, dynamic response to process conditions Self compensation for gas compressibility Custody transfer approvalThe 3098 utilises a resonating element gas densitometer whichis surrounded by a constant volume reference chamber, V,filled with a fixed quantity of gas. A diaphragm ensures that thepressure, P, of the sample gas in the densitometer is equal tothat of the reference gas, and the whole system is Specific Gravity of a gas is the ratio of its molecular weight,M, to that of standard air. However, with equalisedtemperature, T, and pressure, with supercompressibilityeffects, Z, taken into account, the Specific Gravity and relativedensity are Density , sof the sample gas is measured by definition: s= / , the Density of the reference gas is: r= / a fixed quantity of the reference gas is contained in aconstant volume, r/ Mr= P / K(a constant)Thus: s= K.

5 Ms. Zr/ Zsand if the reference gas is the same as the sample gas, Zr= Zsand s= K. MsThus the output of the densitometer is proportional to themolecular weight - and hence Specific Gravity - of the of the 3098 include Specific Gravity measurement Calculation of calorific value using AGA 5 Relative Density measurement3098 SpecificationSpecific Gravity to 3 (typical)Process gasDry, clean, non-corrosive gasesAccuracy*Up to of readingRepeatability* of readingTemperature range-30 to +50 C (-22 to +122 F) or as limited by the dewpoint of the gasTemperature C ( F)Reference to bars (17 to 101psi) absolute @ 20 C (68 F)Supply pressureMin: reference pressure +15%Max: reference pressure +100%Gas flow to 60 normal cc/s ( to )Response time<5s upon entry into enclosureCalibrationUsing gas samples with known Mechanical featuresGas connectorsSwagelock fitting for ( ) Built-in filter7 micronWeight10kg (22lbs) approxMax.

6 Dimensions625 x 612 x 321mm ( x x )Electrical featuresPower supply+ to 33 Vdc, 20 to 30mAOutput signalFrequency; 6V peak to peak for 3-wire system,2 to 3V peak to peak for 2-wire systemElectrical connectionsOutlet to suit M20 cable glandApprovalSafety7812 transducer approved to : EEx ia IIC T6 EMCBS EN50081-2: 1994BS EN50082-2: 1995*These figures apply to the measurement of a typical natural gas at a reference pressure ofabout 6 bars. Two gases of known Specific Gravity are required for calibration (typicallynitrogen and methane). In practice the accuracy achieved will depend on the care taken incalibration. An accuracy of of reading can readily be information3098 Gas Specific Gravity transducer3098 Gas Specific Gravity TransducerDensity TransducerNEMA 4 Xinsulating coverReference chamberControl pressureindicatorChamber filling valve, EPressure control valvePressure relief valveOutput orificeTo signal converterTo ventValve CDiaphragmValve BValve AInputorificeFilterIsolation valve DPressureregulatorOutletValve F(Purging valve)GaslineVent and input for calibrationgasesWith over 35 years experiencein the design, manufacture andinstallation of transducers and flow computers, Solartron are dedicated to bringing you the best possible measurement solutions available SpecificationModel79507951(Wall mounted)

7 (Panel mounted)Flowmeters I/P s (Dual pulse)12 Density l/P s44 Analog l/P s810 PRT (4 wire) I/P s144 Digital l/P s818 Digital O/P s818 Analog O/P s88 Communication Ports (RS232/RS485)331 Each PRT input uses one analog input channelEnvironmentAC power90-265 VAC, 50-60 HzN/ADC power VDC21-30 VDC@25W20-30 VDC@40 WOperating-10 to 50 C (14 to 122 F)Storage-30 to 70 C (-22 to 158 F)EnclosureNEMA4 XNEMA12IP65IP52 Ordering InformationModel7950AA7951AX(Wall mounted)(Panel mounted)A- Klippon connectorsB- D Type connectorsSolartron is market leader in supplying precisionmeasurement solutions for the power, oil, gas,aerospace and process industries. Part of the Roxboro Group PLC, Solartronmanufactures a range of transducers andinstrumentation for on-line continuous measurementof Density and viscosity in liquids and gas.

8 Theseproducts are renowned for their accuracy company s Quality System is approved to BS ENISO 9001:1994. Comprehensive calibration facilitiesinclude two NAMAS Ltd 158 Edinburgh Avenue, SloughBerkshire SL1 4UE UKTelephone +44/0 1753 756600 Fax +44/0 1753 823589 Solartron Inc19408 Park Row, Suite 320 Houston, Texas 77084, USAT elephone +1 281-398-7890 Fax +1 281-398-7891B1253 Solartron pursues a policy of continuous development and productimprovement. The specifications in this document may therefore be changedwithout Solartron 2000 The 795X series of Signal Converters provide the optimuminterface between 7812/3098 transducers and yourprocess and plant electronics: Menu-driven for ease of setup and use Two different hardware platforms for field and panel mounting PC for remote configuration and data logging Integration into DCS, PLC, RTU and other flow computersThe 795X series feature extensive software functionality,including.

9 Density calculations in all standard Density units Calorific value in mass or volume unit terms Calculation of Wobbe Index from Specific Gravity and calorific value Line Density calculation using PTZ for comparison purposesWith the 795X Series, you can also create a completesystem for: Custody transfer metering (795X as flow computer) Gas blending (single or multi-channel) BTU measurement (direct measurement vs. calculated.)795X SeriesSignal ConvertersMore details of the 795X Series flow computers are available in the following brochures:ProductBrochure No795X for the Gas IndustryB1248795X for the Oil IndustryB1249 Flow Computers and Web: Roxboro Group company