Contrec 515 Natural Gas Flow Computer (GN11)

Name: Contrec 515 Natural Gas Flow Computer (GN11)
Brand: Contrec
SKU: 515–GN11
Availability: InStock

SKU: 515–GN11 Category: Digital Indicators Tag: Contrec 515 Series

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The Contrec Model 515 (Application GN11) is a high-reliability natural gas and coke-oven gas flow computer engineered explicitly for custody transfer and fiscal balancing hub loops. Utilizing the definitive SGERG (AGA-8 Gross Characterization Method), this sophisticated computing instrument processes incoming frequency volume flow signals alongside live analog temperature and pressure inputs to accurately resolve complex gas compressibility and density factors. This specific model is highly optimized for operations handling natural gases and coke-oven gases with varying methane and trace element distributions. To safeguard critical process measurements against line tampering or pulse miscounts, the computer features an IP65 weatherproof frontal fascia that supports dual-channel quadrature flow tracking for ISO 6551 Level B pulse security. Complete with an onboard adjustable 8-24V DC sensor excitation supply, isolated 4-20mA analog retransmission, and dual RS-232/RS-485 Modbus RTU serial architecture, it delivers heavy-duty data integrity for large-scale gas distribution grids and utility plant telemetry.

Key Product Features

SGERG / AGA-8 Gross Compressibility: Employs recognized gross characterization equations to compute hyper-accurate gas density and compressibility factors under reference conditions.
Dual-Gas Application Matrix: Core mathematical engine is pre-calibrated to handle both standard natural gas networks and specialized coke-oven gas process lines.
ISO 6551 Level B Pulse Security: Integrates dual-channel quadrature frequency input processing to validate raw pulse counts and neutralize data tampering.
Onboard Transducer Excitation: Minimizes local installation infrastructure by providing a software-controlled 8-24V DC excitation output supplying up to 50mA to directly power field flowmeters.
Comprehensive Audit Trail Logging: Built-in non-volatile flash memory and an integrated Real Time Clock (RTC) capture over 1,000 logging entries of process totals, fluid averages, and system alarms.

Contrec Model 515 GN11 Technical Specifications
● POWER SECTION
Power Supply Options	115 Vac ±15% standard 230 Vac ±15% option (Model code selection 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 gas totalizers, data logs, hardware constants, and system configurations during full plant power failure events.
● INPUT SECTION
Flowmeter Signal Input	Single or dual frequency input channels supporting Quadrature Pulse Signals for maximum transmission security. Compatible Types: Low-level millivolt, contact closure reed switches, Namur proximity sensors, or open collector pulse trains. Frequency Range: 0Hz minimum to 10kHz maximum signal bandwidth.
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 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 and mathematical SGERG density equations.
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.