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Biogas flow meter

AMS Instrumentation & Calibration has released the ST98 air/gas flow meter from Fluid Components International (FCI) suitable for measuring dirty landfill gases for co-generation electric power or for flare gas system reporting.

According to the company, the meter can measure biogases accurately with virtually no maintenance over a long life to provide a lowest lifecycle cost instrumentation solution.
The ST98 Flow Meter with its thermal mass sensor provides direct mass flow measurement without the need for additional temperature or pressure sensors or density calculating devices. The meter’s insertion style configuration makes it simple to install in existing piping without cutting the pipe or welding, offering minimal interruption to plant operations.

With its rugged no-moving parts sensor design, the ST98 meter is suitable for service in biogas and natural gas, as well as numerous other process gases, hydrocarbon mixed or dirty gases and plant compressed air and HVAC systems.

The meter is also suitable for use in other industries such as chemical, electronics, food/beverage, oil/gas, pharmaceutical, pulp/paper, steel and wastewater treatment.
The insertion style ST98 meter’s flow range is from 0.21 to 172NPS in air at standard conditions of 21.2°C and 0°C and 1013,25 bar (a), typical for most gases.
Accuracy is said to be ±1% of reading, plus ±0.5% of full scale, with a repeatability to ±0.5% of reading.

Designed for demanding environments, the rugged ST98’s thermal mass flow sensing element is constructed with two all-welded 316L stainless steel thermowells, which protect two matched platinum precision resistance temperature detectors (RTDs).

One RTD is heated relative to the reference RTD, and the temperature difference between the two is proportional to the process gas mass flow rate.

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