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ST51 Greenhouse Gas Flow Meter for Process and Plant Flue Gas Applications

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AMS Instrumentation and Calibration  supplies the ST51 greenhouse gas flow meter from Fluid Components International (FCI) for process and plant flue gas applications.  

Process and plant engineers in a wide range of industries who are concerned about the US EPA’s greenhouse gas (GHG) monitoring requirements will find that the ST51 mass flow meter provides the high performance and features required of these applications in an instrument that is easy-to-install as well as safe and requires virtually no maintenance to deliver a best-cost solution.  

The ST51 flow meter is ideal for the measurement and monitoring of industrial plant greenhouse gases.  

The ST51 features a no-moving parts design that’s non-clogging and operates over a wide flow range with low-flow sensitivity.  

The flow meter 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 flow meters in the fight against air pollution.  

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

A flue is typically a large pipe, duct, stack, chimney or other venting system attached to a process or industrial manufacturing plant equipment such as a boiler, furnace, steam generator or oven 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 and electric power generation plants among others.  

Depending on the type of plant, process, fuel used and efficiency, these 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 flow meter to measure and monitor GHG as per the EPA’s requirements.  

It features a thermal mass, insertion-style flow element with flow accuracy to ±1% of reading over a broad flow range from 0.08 to 122 MPS, and repeatability of ±0.5 percent of reading.  

The flow element is available for use in line sizes from 51mm to 610mm. It operates over a wide turndown range of 100:1 and at temperatures from -18°C to 121°C. It also withstands pressures up to 34 bar (g).  

The flow element features 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 year-round as temperatures rise and fall seasonally.   

For ease of use and applications flexibility, the ST51 flow meter is packed 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 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.  

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

Input power for the ST51 flow meter can be selected as either 18 to 36 Vdc or 85 to 265 Vac.

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