Contrec 515 Natural Gas Flow Computer (GN11)

Name: Contrec 515 Natural Gas Flow Computer (GN11)
Brand: Contrec
SKU: 515–GN11
Availability: InStock

SKU: 515–GN11 Category: Digital Indicators Tag: Contrec 515 Series

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Natural gas and coke-oven gas custody transfer and fiscal balancing hubs need flow readings that hold up to scrutiny, catching pulse miscounts as well as correcting for real gas behaviour. The Contrec 515 GN11 Natural Gas Flow Computer is built for this, using a frequency volume flow input with dual-channel quadrature tracking.

It takes the frequency flow signal along with temperature and pressure inputs, and resolves gas compressibility and density using the SGERG method (AGA-8 Gross Characterization), which works well for natural gas and coke-oven gas networks where methane content and trace elements vary.

The quadrature input gives ISO 6551 Level B pulse security, so pulse miscounts on the flow signal are caught rather than silently passed through, which matters for custody transfer and fiscal balancing hubs where the numbers need to be defensible. It comes in a weatherproof IP65 housing built for field use.

Before we quote this, we would normally check your flowmeter’s quadrature output, your gas composition data, and your line pressure and temperature.

Hope this helps.

Contrec Model 515 GN11 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 Retentivity	Non-volatile flash memory permanently stores accumulative gas totalizers, data logs, hardware constants, and system configurations during full plant power failure events.
● INPUT SECTION
Flowmeter Signal Input	Single or dual frequency input channels supporting Quadrature Pulse Signals for maximum transmission security. Compatible Types: Low-level millivolt, contact closure reed switches, Namur proximity sensors, or open collector pulse trains. Frequency Range: 0Hz minimum to 10kHz maximum signal bandwidth.
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 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 metrics and mathematical SGERG density equations.
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 highly recommended to protect internal circuits from harsh humidity and ambient chemical corrosion.