Contrec 515 Natural Gas Flow Computer (GN13)

Name: Contrec 515 Natural Gas Flow Computer (GN13)
Brand: Contrec
SKU: 515–GN13
Availability: InStock

SKU: 515–GN13 Category: Digital Indicators Tag: Contrec 515 Series

Email Us WhatsApp Us Follow Celectric's WhatsApp Channel

The Contrec Model 515 (Application GN13) is a heavy-duty natural gas flow computer tailored specifically for differential pressure mass meters using single or stacked transmitter arrays. Engineered to serve as a fiscal billing core, this advanced instrument implements generic differential pressure flow equations that fully incorporate the conditions at which the flowmeter was originally calibrated. Compressibility factors and live gas density boundaries are dynamically evaluated via the SGERG (AGA-8 Gross Characterization Method), providing exceptional precision across both natural gas networks and coke-oven gas process lines. Housed in a weather-sealed IP65 field-mounting enclosure featuring an alphanumeric backlit LCD display and an ergonomic keypad, it guarantees absolute data retention and high noise immunity in demanding, harsh process environments. Complete with isolated 4-20mA retransmission, dual RS-232/RS-485 Modbus RTU serial connectivity, and an adjustable 8-24V DC sensor excitation supply, it delivers a highly integrated data handling solution for modern automated utility grids.

Key Product Features

DP Mass Meter Specialization: Tailored for differential pressure mass flow elements, incorporating primary calibration factors into real-time equations.
SGERG Gross Compressibility Math: Leverages live analog temperature and pressure loops alongside gross natural gas properties to solve exact gas compressibility and density.
Stacked Transmitter Integration: Outfitted to process stacked differential pressure analog inputs to broaden the measurement range and preserve low-flow loop accuracy.
Onboard Transducer Excitation: Features an adjustable, software-controlled 8-24V DC output voltage from the front panel to directly power connected field transmitters.
Robust Audit Tracking: Built-in non-volatile flash memory combines with an integrated Real Time Clock (RTC) data logger to securely capture over 1,000 entries of process totals, logs, and diagnostic states.

Contrec Model 515 GN13 Technical Specifications
● POWER SECTION
Power Supply Options	115 Vac ±15% standard (Optional: 230 Vac ±15% configuration 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.
Data Security Retentivity	Non-volatile flash memory ensures that all gas totalizers, user variables, and system logs 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 Customization: Programmable linear scaling, noise filtering, and custom low-flow cutoff boundaries.
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 generic differential pressure mass equations 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 required for maximum environmental operating range and to avoid damage from moisture and corrosion.