Contrec 515 Frequency Input Natural Gas Flow Computer (GN01)

Name: Contrec 515 Frequency Input Natural Gas Flow Computer (GN01)
Brand: Contrec
SKU: 515–GN01
Availability: InStock

SKU: 515–GN01 Category: Digital Indicators Tag: Contrec 515 Series

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Brand: Contrec

The Contrec Model 515 (Application GN01) is a high-accuracy, industrial gas custody transfer flow computer explicitly engineered to measure the standard volume, mass, and gross heating value of natural gas. Utilizing the definitive AGA-8 Detailed Characterization Method, this sophisticated computing instrument processes real-time gas compositions of up to 21 distinct components alongside live analog temperature and pressure inputs to accurately resolve complex density and compressibility factors. Gross heating parameters are dynamically compiled in absolute accordance with ISO 6976:1995 and GPA Standard 2172-96 criteria. Designed to safeguard fiscal measurements in demanding plant installations, the computer features a weather-tight IP65 front panel that accepts quadrature pulse tracking for ISO 6551 Level B pulse security. Complete with an onboard adjustable 8-24V DC sensor excitation supply, isolated 4-20mA loop retransmission, and dual RS-232/RS-485 Modbus RTU serial architecture, it delivers heavy-duty data integrity for natural gas distribution and power generation balancing hubs.

Key Product Features

AGA-8 Detail Compressibility: Implements comprehensive 21-component natural gas matrix calculations to resolve precise compressibility factors and gas density.
ISO 6976 & GPA 2172 Gross Heat: Computes precision real-time energy transmission and thermal heating contents based on recognized international standard algorithms.
ISO 6551 Level B Pulse Security: Accepts high-security dual-channel quadrature frequency inputs to validate raw pulse counts and neutralize data tampering.
Onboard Transducer Supply: Integrates a front-panel adjustable 8-24V DC excitation output providing up to 50mA to directly power external flowmeters.
Comprehensive Audit Trail: Onboard non-volatile flash memory and a built-in Real Time Clock (RTC) store over 1,000 logging entries of totals, averages, and alarms.

Contrec Model 515 GN01 Technical Specifications
● POWER SECTION
Power Supply Options	115 Vac ±15% standard 230 Vac ±15% option (Model code selection E) 12 to 28 Vdc external line 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
Flowmeter Signal Input	Single or dual frequency input channels supporting Quadrature Pulse Signals for 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 output channel with flexible programmatic 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, 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 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 protection. *Note: Conformal PCB coating (Option C) is required for maximum environmental operating range and to avoid damage from moisture and corrosion.