Contrec 515 Natural Gas Flow Computer (GN16)

Name: Contrec 515 Natural Gas Flow Computer (GN16)
Brand: Contrec
SKU: 515–GN16
Availability: InStock

SKU: 515–GN16 Category: Digital Indicators Tag: Contrec 515 Series

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The Contrec Model 515 (Application GN16) is a heavy-duty, industrial-grade natural gas and coke-oven gas flow computer engineered specifically for differential pressure volumetric meters utilizing single or stacked transmitter arrays. Optimized for custody transfer and gas balancing loops, this sophisticated instrument processes generic differential pressure equations while fully incorporating the reference calibration conditions of the primary element. Real-time density and compressibility factors are dynamically resolved in strict accordance with the SGERG (AGA-8 Gross Characterization Method), rendering it highly effective for gas networks with varying methane and trace element distributions. To safeguard critical process measurements against line tampering or pulse miscounts, the device features a ruggedized, weather-sealed IP65 front panel. Complete with an onboard software-adjustable 8-24V DC sensor excitation supply, isolated 4-20mA loop retransmission, and dual RS-232/RS-485 Modbus RTU serial architecture, the Contrec 515 GN16 delivers definitive data integrity for automated utility grids and large-scale plant telemetry hubs.

Key Product Features

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.
Volumetric DP Flow Specialization: Designed specifically for differential pressure volumetric flow sensors, incorporating primary field calibration states within real-time equations.
Stacked Transmitter Integration: Outfitted to process stacked differential pressure analog inputs to broaden the measurement range and preserve low-flow loop accuracy.
Onboard Transducer Power Supply: Reduces field hardware footprints by offering a front-panel adjustable 8-24V DC excitation output providing up to 50mA to directly power field transmitters.
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 and audits.

Contrec Model 515 GN16 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, data logs, hardware constants, and system configurations 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 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 flow metrics, mass calculations, 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 highly recommended to protect internal circuits from harsh humidity and ambient chemical corrosion.