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Model ST51 Mass Flow Meter from AMS Instrumentation & Calibration

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Fluid Components International (FCI) has released its new Model ST51 Mass Flow Meter for owners, operators and manufacturers of biogas production and methane capture and recovery systems.

The Model ST51, available from AMS Instrumentation & Calibration is designed specifically to solve the challenges to flow metering in bioprocess generated methane.

The Model ST51 operates over a wide flow range with low-flow sensitivity. It is packaged in an explosion-proof transmitter and the calibration is matched to the user’s actual gas composition and installation conditions.

In anaerobic digester produced biogas, gas flow measurement is challenged by the wet, dirty nature of biogas.

The biogas produced is a potentially dangerous mixed composition of primarily methane (CH4) and carbon dioxide (CO2), with smaller percentages of hydrogen sulphide (H2S) and other gases.

The wetness, H2S and other particulates in the gas create a corrosive condensate that deposits itself on the pipe wall and instruments in the pipe. The gas flow varies widely too, based on fluctuating plant process demands and seasonal variations in temperature and humidity.

The Model ST51 is designed specifically to measure biogas and all methane composition gases including natural gas. The Model ST51 features a thermal mass, insertion style flow element with flow accuracy to ±1% of reading over a broad flow range from 0.3 to 400SFPS (0.08 to 122MPS), and repeatability of ±0.5% of reading.

The flow element is available for use in line sizes from 51 to 610mm diameters. It operates over a wide turndown range of 100:1, which is essential due to the variable gas flows in wastewater treatment. It operates at temperatures from -18 to 121°C and withstands pressures up to 34 bar (g).

The new ST51’s robust thermal mass flow sensing element has no moving parts and no orifices to clog or foul to attain maintenance-free service in wet, dirty biogas applications. It also includes built-in temperature compensation circuitry for accurate, repeatable measurement year-round as temperatures rise and fall seasonally.

The flow element is constructed with a 316L stainless steel body and Hastelloy C-22 thermowell sensors to resist corrosion.

It is approved for use in hazardous environments with approvals that include FM, CSA/CRN, Class 1, Div 1, Groups B, C, D; Class 1, Div II, Groups AD, ATEX Zone 1, II 2 G Ex d IIC T6 …T3, II 2 D Ex tD A21 IP67 T90°C…T300°C, IECeX Ex d IIC T6... T3, Ex tD A21 IP67 T 90°C to T 300ºC.

For ease of use and applications flexibility, the Model ST51 is rich with outputs for user interfaces and information.

Dual 4-20mA analogue outputs are user assignable to flow rate and/or temperature, and there is a 0-1kHz pulse output for totalised flow. The transmitter’s digital communications include an RS-232C port and with units that have the digital display option there is a wireless IR link for PDA use.

The Model ST51’s optional integral digital display features a two-line, 16-character LCD screen that is easy to read and can be rotated in 90-degree increments for optimum viewing and installation flexibility.

The LCD screen’s top line is assigned to flow rate and the bottom line is user assignable for temperature readings or totalised flow.

For applications with difficult access or display readability, the ST51’s flow transmitter is also available in a remote mount configuration that can be mounted up to 15m away from the flow element inserted the pipe.

Both the remote mount and integral transmitters are housed in an aluminium enclosure that is NEMA 4X approved and meets IP67 requirements for water and dust ingress protection. Input power for the Model ST51 can be selected as either 18 to 36Vdc or 85 to 265Vac.

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