Contrec 515 Natural Gas Flow Computer (GN13)

Name: Contrec 515 Natural Gas Flow Computer (GN13)
Brand: Contrec
SKU: 515–GN13
Availability: InStock

SKU: 515–GN13 Category: Digital Indicators Tag: Contrec 515 Series

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Natural gas fiscal billing using a DP mass flowmeter, single or stacked transmitter, needs gas density and compressibility corrected for the actual gas composition, not just a fixed factor. The Contrec 515 GN13 Natural Gas Flow Computer is built for this, using the meter’s own mass span calibration.

It runs standard DP flow equations while accounting for the primary element’s own reference calibration conditions, and resolves density and compressibility using the SGERG method (AGA-8 Gross Characterization), which works well for gas networks where methane content and trace elements vary.

In actual application, this unit usually sits out on process plant rather than in a control room, so it comes in a weatherproof housing. It also has an adjustable 8-24V DC sensor excitation supply, isolated 4-20mA loop retransmission, and dual RS-232/RS-485 Modbus RTU ports for integration into plant automation networks.

Before we quote this, we would normally check your DP mass flowmeter’s calibrated span, your gas composition data, and your line pressure and temperature.

Hope this helps.

Contrec Model 515 GN13 Technical Specifications
● POWER SECTION
Power Supply Options	115 Vac ±15% standard (Optional: 230 Vac ±15% configuration via model code 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.
Data Security Retentivity	Non-volatile flash memory ensures that all gas totalizers, user variables, and system logs remain permanently stored during full plant power failure events.
● INPUT SECTION
Differential Pressure Inputs	Single or dual stacked analog differential pressure input channels. Configurable Signal Formats: 4 to 20 mA current loops, 0 to 5 Vdc, or 1 to 5 Vdc voltage signals. Signal Customization: Programmable linear scaling, noise filtering, and custom low-flow cutoff boundaries.
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 generic differential pressure mass equations and mathematical SGERG 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.