The Contrec Model 515 (Application GN12) is a high-accuracy natural gas custody transfer flow computer explicitly optimized to interface with analog volume flowmeters, such as vortex or turbine meters. This advanced processing instrument utilizes the definitive SGERG (AGA-8 Gross Characterization Method) to calculate gas compressibility factors and precise density boundaries across natural and coke-oven gas process lines. To accommodate changing flow profiles with premium precision, the hardware supports stacked analog flow inputs and applies non-linear correction matrices to map the flowmeter’s physical behavior perfectly. Enclosed in an IP65 weatherproof housing featuring a backlit alphanumeric LCD display, it delivers heavy-duty data integrity and definitive audit safety. Complete with an onboard adjustable 8-24V DC sensor excitation supply, isolated 4-20mA loop retransmission, and dual RS-232/RS-485 Modbus RTU serial architecture, it serves as a robust fiscal tracking center for modern plant automation networks.
Key Product Features
- Analog Volumetric Optimization: Tailored specifically to capture standard 4-20mA, 0-5V, or 1-5V analog signals from vortex, turbine, or traditional gas flowmeters.
- Stacked Transmitter Input Option: Incorporates dual stacked analog flow inputs to expand the overall measurement turndown ratio and retain exceptional low-flow accuracy.
- SGERG Gross Gas Characterization: Combines real-time temperature and pressure analog sensor inputs with gross natural gas values to resolve precise density and compressibility factors.
- Onboard Sensor Power Supply: Reduces field cabling footprints by delivering a front-panel software-adjusted 8-24V DC excitation output providing up to 50mA to directly power field transmitters.
- Comprehensive Audit Logging: Onboard non-volatile flash memory and a built-in Real Time Clock (RTC) store over 1,000 entries of process totals, fluid averages, and system alarms.
