Online Gas Chromatograph

Continuous online monitoring of CBG composition and quality, with GCV, NCV, relative density and Wobbe index.

System

Gas chromatography system with FID-SEPC-1

Methane (CH₄)

TCD, 0.01–100%

Carbon dioxide (CO₂)

TCD, 0.01–100%

Oxygen (O₂)

TCD, ppm–25% (molecular sieve 5Å column)

Hydrogen sulphide (H₂S)

FPD, minimum detectable level > 1 ppm

Carbon monoxide (CO)

FPD / TCD, 0–500 / 1,000 ppm

Nitrogen (N₂)

Calculated from measured composition

Analysis cycle

Up to 5-minute sampling frequency

Calculations

GCV, NCV, relative density and Wobbe index (ISO 6974 / ISO 6976)

Data storage

60 days minimum, with trend monitoring

Connectivity

Modbus, RS485 and Ethernet for PLC/SCADA