Biogas Analyser: Multi-Point Sampling and High & Low-Range H2S

The latest Geotech (UK) fixed biogas analyser is the user-installed GA3000 PLUS. It can now optionally monitor up to three sample points and hydrogen sulphide (H2S) ranges of 0-50ppm and 0-10,000ppm. The new developments enhance the widely used ATEX Zone 2 certified GA3000 which analyses methane (CH4) carbon dioxide (CO2) and oxygen (O2) in landfill gas and AD biogas.

With three sample points, AD operators can measure gas quality from more than one digester to check output from each. Tracking production at source can help improve output and spot problems early.

Landfill operators can measure different gas field sections before the gas is mixed. All operators can check mixed gas before it goes to the CHP engine. By measuring the mixed gas going to CHP and to flare, operators can control both.

With multi-point sampling, operators achieve more analysis from one fixed analyser giving even better value. A 4-20mA output for each gas is standard as is MODBUS digital output, allowing communication with SCADA systems. Alarm relays are user configurable.

The GA3000 PLUS offers the advantage of high- and low- range H2S measurement in the same system but from different sample points usually for biogas monitoring before and after desulphurisation. For AD and landfill operators, H2S measurement pre- and post-treatment shows the effectiveness of H2S removal and maintaining H2S below acceptable CHP thresholds and compliance with CHP manufacturer warranty contracts. Vital for CHP restart and protection against sudden gas level changes, the GA3000 PLUS fixed biogas analyser can pay back in weeks or even days.