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The ST51 mass flowmeter from Fluid Components International (FCI) can be used for the measurement and monitoring of industrial plant greenhouse gases.

The ST51 features a no-moving parts design that is non-clogging and 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.

For years, industrial process and manufacturing plants have been required by the EPA, state and local authorities to monitor flue or stack emissions with flowmeters.

Flue gases are the general name given to the mixed composition hydrocarbon greenhouse gases that are the by-product of an industrial plant combustion process.

A flue is typically a large pipe, duct, stack, chimney or other venting attached to a process or industrial manufacturing plant system such as a boiler, furnace, steam generator, oven and so on, through which waste gases are exhausted from the combustion process.

Flue gases are produced by many industries, including chemical and food processing, petroleum refining, pharmaceutical production, metals and advanced materials, paper plants, electric power generation plants and others.

Depending on the type of plant, processes, fuel used and efficiency, flue gases include: nitrogen, carbon dioxide, oxygen and water vapour, sulphur oxides, nitrogen oxide, carbon monoxide, particulates, ozone and methane.

These gases in the atmosphere absorb and emit radiation within the thermal infrared range, which has been identified as the primary cause of global warming.

FCI designed the ST51 flowmeter to measure and monitor GHG per the EPA’s requirements.

It features a thermal mass, insertion-style flow element with flow accuracy to +/-1 per cent of reading over a broad flow range from 0.3 to 400 SFPS (0.08 to 122 MPS) and repeatability of +/-0.5 per cent of reading.

The flow element is available for use in line sizes from 2in to 24in (51mm to 610mm).

It operates over a wide turndown range of 100:1 and at temperatures from 0F to 250F (-18C to 121C).

It withstands pressures up to 500psig [34 bar (g)].

The ST51 flowmeter’s thermal mass flow sensing element has no moving parts and no orifices to clog or foul to attain virtually maintenance-free service in wet, dirty biogas applications.

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

It includes built-in temperature compensation circuitry for accurate, repeatable measurement all year round as temperatures rise and fall.

The ST51 features dual 4-20mA analogue outputs that are user assignable to flow rate and/or temperature and a 0-1kHz pulse output provides totalised flow.

The transmitter’s digital communications include an RS-232C port.

With units that have the digital display option there is a wireless IR link for PDA use.

The ST51’s optional integral digital display features a two-line, 16-character LCD screen that can be rotated in 90deg increments.

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 50ft (15m) away from the flow element inserted in the pipe.

Both the remote mount and integral transmitters are housed in an aluminum enclosure that is NEMA 4X approved and meets IP67 requirements for water and dust ingress protection.

Input power for the ST51 can be selected as either 18 to 36V DC or 85 to 265V AC.

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