Application GN04 Natural Gas (AGA-8 Detailed) Flow Computer
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Model 515 Application GN04 Natural Gas (AGA-8 Detailed) Flow Computer for Stacked DP Meters (ISO 5167 & V-Cones) Features The 515 GN04 application measures the volume, mass and gross heat content of natural gas. The instrument uses single or stacked differential pressure meters such as orifice plates, nozzles, venturi tubes or V-Cones as well as temperature and pressure sensor inputs. The gas density and compressibility factor calculations are based on the AGA-8 equations. The calculations are valid for the region: Tailored for differential pressure meters with single or stacked transmitters AGA-8 Natural Gas Detail Characterization Method calculations for gas compositions with up to 21 components Gross heating values calculated to ISO 6976:1995 and GPA Standard 2172-96 ISO 5167 (2003) DP flow calculations, 9 meter types V-Cone DP flow calculations, 2 cone types Selection of second language and user tags RTC logging with over 1000 entries Programmable pulse width and scaling of pulse output 4-20 mA retransmission RS-232 and RS-485 (optional) serial ports Modbus RTU, Printer and other serial port protocols Front panel adjustment of 8-24 V DC output voltage Backlit display The instrument calculates the flow according to the differential pressure equations for the ISO 5167 or V-Cone meters. The flow calculations incorporate the conditions at which the flowmeter was calibrated and accurately account for thermal expansion effects. The AGA-8 Detail Characterization Method is used to obtain accurate values of density and compressibility factors for the flow calculations. For other gas properties, such as viscosity and isentropic exponent, user entered values are used. Formulas Volume flow = Mflow /  flow Corrected flow = Mflow /  ref Heat flow = Mflow  H m where: Mflow = density at flow conditions = density at reference conditions = mass gross heating value Analog Input 4 Hi Flow Stacked Option Temperature Pressure Transmitter Transmitter

Displayed Information All set-up parameters, totals and logged data are stored in non-volatile memory with at least 30 years retention. The front panel display shows the current values of the input variables and the results of the calculations. A list of the variables for this application and their type (total or rate) is shown at the end of this document. Temperature and Pressure Input Types The instrument can be supplied with a real-time clock for data logging of over 1000 entries of the variables as displayed on the main menu. Temperature sensor input(s) can be either PT100, PT500, 4-20...

Specifications Operating Environment Temperature Humidity Power Supply Consumption Protection Dimensions (panel option) -20 °C to +60 °C (conformal coating) +5 °C to +40 °C (no coating) 0 to 95% non condensing (conformal coating) 5% to 85% non condensing (no coating) 100-240 V AC (+/-10%) 50-60 Hz (+/-10%) or 12-28 V DC 6 W (typical) Sealed to IP65 (Nema 4X) when panel mounted 147 mm (5.8") width 74 mm (2.9") height 167 mm (6.6") depth Display Type Digits Characters LCD Backup Update Rate Backlit LCD with 7-digit numeric display and 11-character alphanumeric display 15.5 mm (0.6") high 6 mm...

Ordering Information Product Codes Model Supplementary Code Field mount enclosure (NEMA 4X / IP66) Explosion proof Ex d (IECEx/ATEX), metric glands (5 specifies heater) Panel mount enclosure Explosion proof Ex d (CSA), NPT glands (6 specifies heater) 0 1 4 logic inputs, 2 isolated outputs, 4 relays, real-time clock data logging, RS232 (DB9) and RS485 communication ports Output Options 4 logic inputs, 1 isolated output, 2 relays (only relay type 1 is available), RS232 (DB9) communication port 4 logic inputs, 2 isolated outputs, 4 relays, real-time clock data logging, RS232 (DB9) and...