Brand: Galvanic

AccuChrome™ GC BTU & Hydrocarbon Gas Analyzer

Name: AccuChrome GC BTU & Hydrocarbon Gas Analyzer – Brochure
Brand: Galvanic

Description

Overview

The AccuChrome™ GC is Galvanic Applied Sciences’ third-generation Btu and hydrocarbon gas chromatograph, designed and built for critical process-monitoring and control applications in the harshest environments. The AccuChrome™ line spans from the legacy GC3, through the widely available and trusted GC4, to today’s GC5, offering flexible, field-proven gas chromatography for BTU, C9+ hydrocarbons, sulfur, biogas, and VOC analysis, with options that balance proven reliability and next-generation performance in hazardous-area-ready systems.

Backed by manufacturer datasheet documentation, Seven Star LLC proudly offers the AccuChrome™ GC platform to natural gas transmission operators, custody transfer stations, and gas processing facilities across the Sultanate of Oman, Muscat, and the wider GCC. Whether performing Btu and constituent analysis of natural gas for custody transfer, process optimization during natural gas fractionation, or 40 CFR 60 Subpart JA flare-gas emissions monitoring for regulatory compliance, operators need precise, real-time measurements they can count on.

Measurement Principle

The AccuChrome™ GC consists of two compartments: an upper chromatograph oven housing the components involved in the chromatographic analysis process, including the 10-port valve (and 6-port valve in High Speed Heating Value Analysis configurations), the chromatograph column(s), and the thermal conductivity detector (TCD); and a lower compartment housing the AccuChrome electronics. A heater maintains a constant temperature within the oven, which is critical for proper separation of the sample components as they pass through the micro-packed columns, manufactured by Galvanic to ensure quality and consistency.

The chromatograph uses industry-leading valves rated for up to 1 million injections, with a simple mechanical design that makes servicing straightforward and inexpensive. With auto calibration and validation capabilities enabling fully hands-off operation, and a design that provides ready access to all field-serviceable components, the AccuChrome™ delivers consistent, field-proven performance while reducing downtime and the need for costly module replacement.

Product Line: GC3, GC4, and GC5

The AccuChrome™ family offers three generations of gas chromatography technology to match different application needs. The legacy GC3 remains supported with full operations and maintenance documentation for existing installations. The GC4 delivers Btu and hydrocarbon content analysis purpose-built for natural gas processing and custody transfer applications, representing the most widely available and trusted model in the lineup.

The newest GC5 represents a fundamental shift in gas chromatography, redefining the GC from a complex analytical instrument into a deployable, field-ready sensor. Built on silicon-miniaturized, modular GC technology, the GC5 delivers laboratory-grade gas chromatography in a compact footprint, supporting high-accuracy custody transfer, natural gas quality monitoring, sulfur analysis, and biomethane measurement on a single platform using a single carrier gas.

Key Features

The AccuChrome™ GC platform combines field-proven reliability with flexible analytical capability. Core capabilities include:

Three generations of gas chromatography technology (GC3, GC4, GC5) to match application requirements.
Auto calibration and validation capabilities enabling fully hands-off operation.
BTU, C9+ hydrocarbon, sulfur, biogas, and VOC analysis capability across the product line.
Industry-leading valves rated for up to 1 million injections with simple, low-cost servicing.
Micro-packed columns manufactured by Galvanic for consistent, reproducible results.
Modbus RS232, RS485, and TCP/IP digital outputs for straightforward system integration.
CSA Class 1 Division 1 and Division 2 hazardous-area certifications, Groups BCD.
Report generation feature for standard measured and calculated values based on GPA or ISO standards.

Industrial Applications

The AccuChrome™ GC platform is engineered for natural gas custody transfer, process optimization during natural gas fractionation, and regulatory flare-gas emissions monitoring under 40 CFR 60 Subpart JA across Oman’s oil and gas sector. Natural gas transmission pipelines, gas processing plants, and petrochemical facilities rely on the AccuChrome™ for precise, real-time Btu and hydrocarbon composition data supporting both commercial custody transfer and internal process control.

Working closely with plant engineers in the region, Seven Star LLC supports oil and gas operators, LNG terminals, and gas transmission authorities throughout the Sohar and Salalah economic zones and the broader GCC region with the AccuChrome™ GC platform’s proven measurement reliability.

Technical Specifications

The table below lists the technical parameters published by Galvanic Applied Sciences for the AccuChrome™ GC Btu and C9+ hydrocarbon analyzer in its GC4-class configuration. The silicon-miniaturized GC5 achieves a materially faster analysis cycle and is specified separately:

Parameter	Specification
Product Line	AccuChrome™ GC3, GC4, GC5
Accuracy (Heating Value)	±0.25 Btu/scf per 1000 Btu/scf
Repeatability	±0.25 Btu/scf per 1000 Btu/scf
Response Time	4 to 5 Minutes
Power Supply	24VDC or 90–240VAC, 50/60Hz; 100W Startup, 50W Running
Sample Flow	100 cc/min, 1 barg (0.21 SCFH, 15 psig)
Carrier Gas	Helium or Hydrogen, 5.5–6.9 barg, 20 cc/min (80–100 psig)
Digital Outputs	Modbus RS232, Modbus RS485, Modbus TCP/IP
Digital Inputs	2 Dry Contact, 2 Wet Contact (12/24VDC)
Analog Inputs/Outputs	3 Universal Inputs; 4 x 4–20mA Outputs
Relays	4 x SPDT, 8 Amp @ 250VAC
Certifications	CSA Class 1 Division 1 & 2, Groups BCD
Component Accuracy	±0.5% of full scale for components ranging 50% or above; ±1% of full scale between 5% and 50%; ±2% of full scale for trace components
Detector	Thermal conductivity detector (TCD)
Oven	Airless heat-sink oven, isothermal at 70 °C
Ambient Temperature	−18 °C to +60 °C, 0–95% relative humidity, non-condensing
Streams	Multi-stream capability, up to 8 streams
Data Storage	32 GB expansion storage capacity
Additional Certifications	IECEx, ATEX Zone 1, Measurement Canada approved

Hazardous-Area Certification and Site Conditions

Beyond the CSA Class 1 Division 1 and Division 2 Groups BCD listings, the AccuChrome™ GC is available with IECEx and ATEX Zone 1 certification and holds Measurement Canada approval for custody transfer service. For projects in Oman and the wider GCC the IECEx and ATEX route is normally the governing one, since regional operating companies and their EPC contractors specify to IEC rather than North American area classification, and Seven Star LLC confirms the certificate set against the ordered configuration before quotation rather than after delivery.

Environmentally, the analyzer is rated for ambient temperatures from −18 °C to +60 °C at 0 to 95% relative humidity, non-condensing, which covers unshaded pipeline and wellhead installations through an Omani summer. The oven runs isothermally at 70 °C on an airless heat-sink design, removing the instrument-air purge and its associated utility load from the analyzer shelter. A further practical advantage in remote service is that the thermal conductivity detector will not burn out on loss of carrier gas, unlike a flame-based detector, so a cylinder run dry over a long unattended interval costs an analysis gap rather than a hardware replacement.

Sample System and Utility Requirements

The AccuChrome™ GC is designed around a straightforward sample and utility envelope. Sample is delivered at approximately 100 cc/min and 1 barg (0.21 SCFH, 15 psig), with the sample conditioning system built to keep inlet pressure within the analyzer’s 100 psig maximum, and a bypass sweep is recommended on long sample lines to cut transport lag so the reported composition reflects present pipeline conditions rather than gas drawn minutes earlier. Carrier gas is helium or hydrogen at 5.5 to 6.9 barg (80 to 100 psig) and roughly 20 cc/min, run in quarter-inch stainless tubing.

Power draw is modest at 100 W on start-up and 50 W running, from either 24 VDC or a 90–240 VAC 50/60 Hz supply, which keeps solar or UPS-backed installation practical at unmanned metering stations. The injection valves are rated for up to one million injections before service, and because the design favours mechanically simple, field-replaceable parts over sealed analytical modules, routine maintenance can be carried out by a site instrument technician instead of requiring a module exchange programme.

Request a Quote for AccuChrome™ GC BTU & Hydrocarbon Gas Analyzer

To submit a formal Request for Quote (RFQ), check current availability and lead time, or arrange technical consultation for the AccuChrome™ GC BTU & Hydrocarbon Gas Analyzer, please contact Seven Star LLC today. With fast quotation turnaround and technical support, our engineers are ready to assist with rapid sourcing for your natural gas quality monitoring and custody transfer projects.

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About brand

Hydrogen sulfide measurement in natural gas is where Galvanic Applied Sciences built its name, and its lead acetate tape analyzers are written into many gas quality specifications. The company was founded in 1975 and is based in Calgary, Canada. Seven Star LLC sources and supplies Galvanic process analyzers for gas and liquid streams, together with their consumables and spare parts, for operators in Oman, working from the analyzer model, serial number and application data.

Galvanic analyzer families listed here

Galvanic analyzers on this page fall into three groups:

Sulfur and gas quality: ProTech903 and ProTech 1000 Z2 tape-based H2S and total sulfur analyzers, the AccuLase-GPA tunable diode laser analyzer for H2S, CO2 and H2O, and AccuChrome gas chromatographs for heating value and composition
Sulfur recovery: Brimstone analyzer systems and the 943-TGX tail gas analyzer
Liquids and photometry: Monitek turbidity, suspended solids and color monitors, Monitek Ultrasonic oil-in-water monitors, the AccuSeries-LPA wet chemistry analyzer, the Viscosite in-line viscometer and FPA 4100 UV photometers

GasMicro and GasMicro NG electronic volume correctors complete the list.

Where Galvanic analyzers are used

The manufacturer names natural gas processing, pipelines and distribution, refining and oil production, chemical and petrochemical production, power and biogas, water and wastewater, and food and beverage as its markets. In the GCC the common duties are H2S and total sulfur at sales gas and custody transfer points, tail gas control on Claus sulfur recovery units, heating value measurement, and oil-in-water monitoring of produced water.

Ordering Galvanic analyzers and parts: what we need

For a new Galvanic H2S analyzer or chromatograph, send the stream composition, the component and range to be measured, sample pressure and temperature, the number of streams, area classification, power supply and the outputs required. For consumables and spares such as sensing tape, lamps, columns or pump parts, send the analyzer model and serial number and the part number from the manual. Manuals differ by generation, so a nameplate photo helps us check the item against the manufacturer's documentation.

Browse Galvanic products by category: Gas Analyzer Systems, Liquid Analytical Systems, Flow Computers.

Frequently Asked Questions

What is the difference between the GC3, GC4, and GC5 models?

The GC3 is the legacy model, the GC4 is the widely trusted mainstay for Btu and hydrocarbon content analysis, and the GC5 is the newest model, built on silicon-miniaturized modular GC technology for a smaller footprint and faster analysis.

What applications is the AccuChrome GC used for?

The AccuChrome GC is used for natural gas custody transfer, process optimization during natural gas fractionation, and flare-gas emissions monitoring for regulatory compliance under 40 CFR 60 Subpart JA.

Does the AccuChrome GC support automated operation?

Yes. The AccuChrome GC includes auto calibration and validation capabilities that enable fully hands-off operation with minimal operator intervention.

What hazardous area certifications does the AccuChrome GC hold?

The AccuChrome GC is CSA certified for Class 1 Division 1 and Division 2 hazardous locations, Groups BCD.

Is Seven Star LLC a trusted supplier for Galvanic products?

Yes. Seven Star LLC is an experienced supplier of Galvanic Applied Sciences instrumentation in Oman and the GCC, providing genuine products with full support.

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