Contrec 515 Natural Gas Flow Computer (GN03)

Name: Contrec 515 Natural Gas Flow Computer (GN03)
Brand: Contrec
SKU: 515–GN03
Availability: InStock

SKU: 515–GN03 Category: Digital Indicators Tag: Contrec 515 Series

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The Contrec Model 515 (Application GN03) is a heavy-duty natural gas flow computer tailored for differential pressure mass meters using either single or stacked transmitter arrays. Designed to serve as a fiscal calculation core, this advanced instrument implements generic differential pressure flow equations that incorporate the specific conditions at which the flowmeter was calibrated. Compressibility factors and live gas density boundaries are dynamically evaluated via the international AGA-8 Detailed Characterization Method, allowing precision tracking across gas matrices of up to 21 elements. Gross heating value outputs are calculated in complete compliance with ISO 6976:1995 and GPA Standard 2172-96 standards to secure high-integrity B2B energy accounting. Encased in an IP65 weatherproof housing featuring a backlit alphanumeric LCD screen and an elastomeric keypad, the Model 515 GN03 ensures exceptional data retention and reliable performance in demanding, harsh process plant architectures.

Key Product Features

Differential Pressure Specialization: Tailored specifically for differential pressure mass flow elements, incorporating primary calibration factors into real-time equations.
Stacked DP Transmitter Handling: Supports stacked analog differential pressure inputs to dramatically increase the operational flow range and retain high accuracy.
AGA-8 detailed Gas Characterization: Combines live analog temperature and pressure measurements with 21-component natural gas properties to solve exact gas compressibility.
Onboard Sensor Power Supply: Outfitted with an integrated, front-panel adjustable 8-24V DC transducer excitation output providing up to 50mA to eliminate secondary field wiring loops.
Simultaneous Dual-Mode Telemetry: Standardized with side-by-side 4-20mA analog loop retransmission, a scaled open collector pulse output, and dual RS-232/RS-485 Modbus RTU serial links.

Contrec Model 515 GN03 Technical Specifications
● POWER SECTION
Power Supply Inputs	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 current capacity up to 50mA.
Data Security Retentivity	Non-volatile flash memory ensures that all volumetric 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 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 highly recommended to protect internal circuits from harsh humidity and ambient chemical corrosion.