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The ST98 Biogas Flow Meter from Fluid Components International (FCI) precisely measures the methane gases from companies that harvest bio-waste in fermentors or digesters.

The cow manure that accumulates on dairy farms, for example, is a rich source of biogas that can be harnessed for the eco-friendly production of green electric power.

The output from the manure biomass digestion process results in a complex gas mixture that includes methane (CH4), carbon dioxide (CO2), water and trace amounts of hydrogen sulphide (H2S).

The biomass production process requires optimising gas creation, cleansing, drying, storage (tank or bag-type accumulator) to ultimately use the biogas as a fuel source for heating or powering a co-gen engine to produce electricity.

Biogas flow must be measured at several points in the system to provide operators with critical information for optimal gas production, control and reporting.

A ground flare is an integral part of the safety system for the process.

Measuring the mass flow of biogas is a challenge.

This gas is typically 65 per cent CH4 and 35 per cent CO2.

Biogas is dirty and corrosive and its particulates quickly clog any flow meter designed with orifices.

It also fouls meters with moving parts.

Low-flow measurement sensitivity and a wide turndown are essential as biogas flow variability is based on biomass supply and environmental fluctuations.

The ST98 Mass Flow Meter has a reliable thermal mass-sensing element that deliver precision gas flow rate, totalised flow and temperature measurement.

It is ideal for biogas measurement and features high accuracy to +/-1 per cent of reading, 0.5 per cent of full scale.

The ST98 offers repeatability to +/-0.5 per cent of reading and is temperature-compensated for accurate measurement under variable environments.

The insertion style ST98 Flow Meter operates over a flow range from 0.75 to 600 SFPS (0.21 to 172 NMPS).

It features a turndown ratio that is factory preset from 10:1 up to 100:1 within the calibrated flow range and operates at pressures up to 250 psig (17 bar (g)).

The ST98 thermal mass-sensing element is comprised of two all-welded 316L stainless-steel thermowells that protect two matched platinum precision resistance temperature detectors (RTDs).

With a highly reliable no-moving parts design, one RTD is heated relative to the reference RTD and the temperature difference between the two is proportional to the process’s biogas mass flow rate.

The ST98 transmitter features robust, microprocessor-based electronics.

The transmitter can be located integral with the sensor or remote mounted up to 1000ft (350m).

A Nema/CSA Type 4X (IP66) rated enclosure and explosion-proof, Division 1 (Zone1) rated enclosures are available for the toughest environments.

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