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

Email Us WhatsApp Us Follow Celectric's WhatsApp Channel

Natural gas fiscal and custody transfer metering using an ISO 5167 or V-Cone differential pressure element needs gas density and compressibility corrected for the actual gas composition. The Contrec 515 GN04 Natural Gas Flow Computer is built for this, with built-in profiles for 9 ISO 5167 meter types plus 2 V-Cone configurations.

It resolves gas density, compressibility, and Reynolds number using the AGA-8 Detailed Characterization Method across gas matrices with up to 21 components, and works out gross heating values per ISO 6976:1995 and GPA 2172-96. It also has a Detail or Basic main menu, so operators can pick the level of detail they need day to day.

In actual application, this unit usually sits out on process plant rather than in a control room, so it comes in a weatherproof IP65 housing. It also has an adjustable 8-24V DC sensor supply for integration into plant systems.

Before we quote this, we would normally check your DP element type and calibration standard, your full gas composition analysis, and your line pressure and temperature.

Hope this helps.

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.