Contrec 515 Natural Gas Flow Computer (GN02)

Name: Contrec 515 Natural Gas Flow Computer (GN02)
Brand: Contrec
SKU: 515–GN02
Availability: InStock

SKU: 515–GN02 Category: Digital Indicators Tag: Contrec 515 Series

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The Contrec Model 515 (Application GN02) is an industrial-grade natural gas custody transfer flow computer explicitly optimized to interface with analog volume flowmeters, such as vortex or turbine meters. This high-performance instrument utilizes the definitive AGA-8 Detailed Characterization Method to calculate gas compressibility factors and accurate density boundaries across gas compositions of up to 21 distinct components. 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. Gross heating parameters are dynamically evaluated in absolute accordance with ISO 6976:1995 and GPA Standard 2172-96 standards. Housed in a weather-tight enclosure with a backlit display and a smart front panel, it delivers heavy-duty data integrity for natural gas transmission lines. Complete with isolated 4-20mA loop retransmission, dual RS-232/RS-485 Modbus RTU serial architecture, and an adjustable 8-24V DC sensor excitation supply, it serves as a robust fiscal tracking center for modern plant automation networks.

Key Product Features

Analog Meter Optimization: Tailored specifically to capture standard 4-20mA, 0-5V, or 1-5V analog signals from vortex, turbine, or traditional gas flowmeters.
Stacked Transmitter Integration: Incorporates dual stacked analog flow inputs to expand the overall measurement turndown ratio and retain exceptional low-flow accuracy.
AGA-8 detail Gas Math: Processes multi-component natural gas properties through precise detail algorithms to calculate accurate real-time density values.
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.
Robust Audit Trail Logging: Built-in non-volatile memory utilizes an integrated Real Time Clock (RTC) logger to capture over 1,000 entries of process totalizers, fluid averages, and system alarms.

Contrec Model 515 GN02 Technical Specifications
● POWER SECTION
Power Supply Options	115 Vac ±15% standard 230 Vac ±15% option (Model code selection E) 12 to 28 Vdc external field loop power input
Transducer Power Output	Adjustable 8 to 24 Vdc sensor excitation voltage regulated via software controls; maximum continuous current capacity up to 50mA.
Memory & Data Security	Non-volatile flash memory permanently preserves accumulative gas totalizers, hardware calibration variables, and system configurations during full plant power blackout events.
● INPUT SECTION
Analog Flowmeter Inputs	Single or dual stacked analog flow channels. Configurable Signal Formats: 4 to 20 mA current loops, 0 to 5 Vdc, or 1 to 5 Vdc voltage signals. Signal Correction: Multi-point non-linear correction filters can be assigned to reflect customized meter calibrations.
Compensation Analog Inputs	Analog Temperature Input: RTD (Pt100) or linear 4 to 20 mA process loop. Analog Pressure Input: 4 to 20 mA active linear transmitter input.
● OUTPUT SECTION
Analog Retransmission Loop	Fully isolated 4 to 20 mA DC current loop retransmission output channel with programmable range scaling.
Digital Pulse Retransmission	Open collector transistor output featuring software-defined volumetric scaling factor and adjustable pulse width duration.
Serial Infrastructure	RS-232 Port: Dedicated port optimized for direct PC terminal setup or local ticket receipt printing. RS-485 Port (Optional): Multi-drop serial bus supporting robust long-distance plant networking. Supported Protocols: Modbus RTU (Slave), standard Ticket Printer, and Contrec command-line protocols.
Local Display Screen	Backlit alphanumeric LCD display showcasing raw Volume, Volume Flowrate, Corrected Volume, Corrected Flowrate, Heat, Heat Flowrate, Mass, Mass Flowrate, Temperature, Pressure, and Compressibility Factor.
● PERFORMANCE
Calculation Accuracy	Better than ±0.01% of reading for all internal flow equations and mathematical AGA-8 density solutions.
Analog Transmittance Precision	Better than ±0.05% of full scale range under reference conditions.
Data Logging Matrix	Real-Time Clock (RTC) event log memory block capturing over 1,000 entries for continuous process audit tracking.
● PHYSICAL
Mechanical Housing Layout	Molded field-mounting enclosure utilizing high-rigidity impact polymers (Optional flush panel mount, pipe track mount, or deployment within a heavy Ex410 explosion-proof housing).
Tactile Operator Array	Robust elastomeric keyboard layout providing precise tactile user input feedback.
● STANDARDS CONFORMITY
Environmental Safeguarding	Standard IP65 weatherproof frontal fascia shield protection. *Note: Conformal PCB coating (Option C) is required for maximum environmental operating range and to avoid damage from moisture and corrosion.