Contrec 515 Natural Gas Flow Computer (GN04)

Name: Contrec 515 Natural Gas Flow Computer (GN04)
Brand: Contrec
SKU: 515–GN04
Availability: InStock

SKU: 515–GN04 Category: Digital Indicators Tag: Contrec 515 Series

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The Contrec Model 515 (Application GN04) is an advanced natural gas flow computer designed specifically for differential pressure elements calibrated to ISO 5167 (2003) or V-Cone standards. Engineered for maximum fidelity in fiscal and custody transfer loops, the math engine natively handles 9 distinct ISO 5167 meter configurations (including orifice plates, nozzles, and venturi tubes) and 2 specialized cone categories. To ensure extreme precision, it applies the AGA-8 Detailed Characterization Method to calculate gas density, compressibility, and real-time Reynolds numbers across complex 21-component gas matrices. Gross heating values are concurrently evaluated via ISO 6976:1995 and GPA 2172-96 standards. Built for industrial process automation, it allows operators to toggle between Detail and Basic main menus to streamline plant interaction. Protected by an IP65 weatherproof housing, the Model 515 GN04 incorporates an adjustable 8-24V DC sensor excitation supply, isolated 4-20mA retransmission, and dual-port RS-232/RS-485 Modbus RTU serial communication for high-density factory telemetry.

Key Product Features

Standardized DP Flow Math: Native integration of ISO 5167 (2003) differential pressure equations covering 9 distinct meter types and V-Cone algorithms for 2 cone configurations.
Flexible Menu Navigation Views: Supports user selection between a comprehensive “Detail” layout or a simplified “Basic” main menu to match operator technical profiles.
AGA-8 Detail Compressibility: Combines real-time differential pressure, temperature, and pressure sensor inputs to accurately compile gas density and fluid dynamics.
Onboard Transducer Power Supply: Reduces field hardware costs by providing a software-controlled, adjustable 8-24V DC excitation output supporting up to 50mA.
Multi-Protocol Telemetry Hub: Outfitted with simultaneous isolated 4-20mA retransmission, a scaled open collector pulse output, and serial ports supporting Modbus RTU, Printer, or PC protocols.

Contrec Model 515 GN04 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 ensures that all volume totalizers, mass logs, configuration constants, and history records 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 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, Reynolds numbers, ISO 5167 parameters, 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.