Contrec 515 Natural Gas Flow Computer (GN05)

Name: Contrec 515 Natural Gas Flow Computer (GN05)
Brand: Contrec
SKU: 515–GN05
Availability: InStock

SKU: 515–GN05 Category: Digital Indicators Tag: Contrec 515 Series

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Natural gas fiscal metering using a DP element under the AGA-3 standard needs gas density and compressibility corrected for the actual gas composition, not just a fixed factor. The Contrec 515 GN05 Natural Gas Flow Computer is built for this, using the AGA-8 Detailed Characterization Method for gas matrices with up to 21 components.

It runs AGA-3 compliant DP flow calculations while accounting for thermal expansion and the primary element’s own calibration conditions. Stacked DP transmitters extend the turndown ratio without losing low-flow accuracy, and gas compressibility, density, and Reynolds number are continuously evaluated via AGA-8 Detailed Characterization.

In actual application, this unit usually sits out on process plant rather than in a control room, so it comes in a weatherproof IP65 field-mounting enclosure with a backlit LCD. It also has an adjustable 8-24V DC sensor supply for integration into plant systems.

Before we quote this, we would normally check your DP transmitter range (single or stacked), your full gas composition analysis, and your line pressure and temperature.

Hope this helps.

Contrec Model 515 GN05 Technical Specifications
● POWER SECTION
Power Supply Options	115 Vac ±15% standard (Optional: 230 Vac ±15% layout 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.
Memory Retentivity	Non-volatile flash memory permanently stores accumulative volumetric totalizers, mass logs, configuration constants, and history records during full plant power failure events.
● INPUT SECTION
Differential Pressure Inputs	Single or dual stacked analog differential pressure input channels configured for AGA-3 orifice loops. Configurable Signal Formats: 4 to 20 mA current loops, 0 to 5 Vdc, or 1 to 5 Vdc voltage signals. Signal Processing: Active filtering, programmable low-flow cutoff boundaries, and linear extraction.
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 Communications Channel	RS-232 Configuration: Standard port connection link optimized for local PC terminal setup or ticket printer attachment. RS-485 Configuration (Optional): Multi-drop serial bus supporting long-range data tracking. Supported Protocols: Modbus RTU (Slave), standard Ticket Printer, and Contrec command-line protocols.
Local Operator Interface	Backlit alphanumeric LCD display with language selection and custom tags. Showcases real-time parameters: Volume, Corrected Volume, Heat, Mass, Mass Flow, Temperature, Pressure, Differential Pressure, Reynolds Number, and Compressibility Factor.
● PERFORMANCE
Calculation Accuracy	Better than ±0.01% of reading for all internal AGA-3 orifice equations, fluid Reynolds numbers, and mathematical AGA-8 density solutions.
Analog Transmittance Precision	Better than ±0.05% of full scale range under reference conditions.
Data Logging Matrix	Integrated Real-Time Clock (RTC) logging matrix capturing over 1,000 entries for continuous process audit tracking.
● PHYSICAL
Enclosure Shell Construction	Field-mounting enclosure layout molded from high-impact chemical-resistant polymers (Available for flush panel mount, pipe track mount, or inside a heavy Ex410 explosion-proof housing).
Tactile Operator Array	Ergonomic elastomeric tactile keypad providing direct operator command interaction.
● 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.