Contrec 515 Natural Gas Flow Computer (GN14)

Name: Contrec 515 Natural Gas Flow Computer (GN14)
Brand: Contrec
SKU: 515–GN14
Availability: InStock

SKU: 515–GN14 Category: Digital Indicators Tag: Contrec 515 Series

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The Contrec Model 515 (Application GN14) is a high-performance industrial natural gas flow computer engineered specifically for differential pressure meters utilizing single or stacked transmitter arrays. Optimized for custody transfer and fiscal balancing, this sophisticated processing instrument natively integrates ISO 5167 (2003) differential pressure equations covering 9 distinct meter types alongside V-Cone algorithms for 2 cone configurations. Compressibility and density factors are dynamically resolved in strict accordance with the SGERG (AGA-8 Gross Characterization Method), rendering this model highly effective for both natural gas and coke-oven gas networks. Housed in a ruggedized, weather-tight enclosure with a backlit LCD screen, it delivers exceptional data reliability and audit safety under severe plant constraints. Outfitted with an adjustable 8-24V DC sensor excitation supply, isolated 4-20mA analog retransmission, and dual-port RS-232/RS-485 Modbus RTU serial links, the Contrec 515 GN14 provides a comprehensive telemetry core for high-density B2B gas processing manifolds.

Key Product Features

Standardized DP Flow Calculations: Native integration of ISO 5167 (2003) parameters for 9 meter types (orifices, nozzles, venturis) and V-Cone equations for 2 cone configurations.
SGERG / AGA-8 Gross Compressibility: Processes live analog temperature and pressure inputs to accurately resolve complex gas density factors across natural and coke-oven gas profiles.
Stacked Transmitter Optimization: Configured to manage dual stacked differential pressure transmitters to extend overall operational flow turndown limits.
Onboard Transducer Power Supply: Features an integrated, front-panel adjustable 8-24V DC excitation output providing up to 50mA to eliminate separate field power loops.
Robust Audit Trail Logging: Built-in non-volatile memory integrates a Real Time Clock (RTC) data logger capable of capturing over 1,000 entries for continuous process tracking.

Contrec Model 515 GN14 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 gas totalizers, configuration constants, mass logs, 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 ISO 5167 or V-Cone 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 generic differential pressure equations, ISO 5167 configurations, and mathematical SGERG 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.