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Measurement and Testing
Wet gas fl ow meter solves biogas moisture, corrosion and accuracy issues
With its innovative Wet Gas MASSter thermal dispersion fl ow sensor, the ST100A Flow Meter from Fluid Components International solves wet gas and entrained moisture issues that affect biogas measurement accuracy in landfi ll co-gen power systems and wastewater treatment digester applications, as well as providing down-the-pipe rain shielding in power plants, refi neries and other types of stack monitoring.
The ST100A Flow Meter with a Wet Gas MASSter fl ow sensor recently solved a biogas measurement problem at a wastewater treatment plant. The engineers at the site found that wet, sticky biogas was causing a corrosion issue affecting the fl ow sensors of their existing gas fl ow meters, leading to over- range and poor accuracy measurement issues.
The plant engineer believed a mixture of carbon dioxide (CO2 ), water and trace amounts of hydrogen
sulphide (H2S) were corroding the 316 stainless steel sensors. To solve this problem, the FCI customer applications team suggested that its Model ST100A Wet Gas MASSter Flow Meter with corrosion-resistant Hastelloy C-276 sensor tips would solve both problems.
The unique shielded mechanical design of FCI’s wet gas sensor shunts water vapour away before it reaches the sensor and prevents any water vapour from collecting on the sensor head to avoid corrosion and therefore any measurement accuracy or consistency issues. The new ST100A Flow Meters were installed in 2021 and have performed without issue since then at the wastewater treatment plant—problem solved.
By shunting moisture, condensation and water droplets away from the ST100A’s thermal mass fl ow sensor, accurate gas fl ow measurement is maintained while minimising errors that could occur from a cooling effect on the sensor that might cause a spike or false high reading. FCI’s wet gas sensor option can be used in applications that have either moisture entrained in the gas (annular mist) or for protection against down the pipe rain in larger, vertical stacks.
FCI’s ST100 Flow Meters feature thermal dispersion mass fl ow sensors that are designed with constant power technology, which compensates for the variable temperatures commonly found in wet gas, which lead to poor measurement. They are calibrated to specifi c wet gas mixtures in FCI’s NIST-approved Calibration Laboratory, and this meter is available with both built-in pressure sensing and multiple calibration groups for accuracy under diffi cult wet gas conditions.
The ST100A Meter can be calibrated to measure virtually any wet gas composition, mixed gases, dirty gases and specialty gases. The basic insertion style air/gas fl ow meter features a thermal fl ow sensing element that measures fl ow from 0.25 to 1000 SFPS (0.07 NMPS to 305 NMPS) with accuracy of ±0.75 percent of reading, ±0.5 percent of full scale.
Constant power type thermal mass fl ow sensors are designed with platinum reference temperature detectors (RTDs). These advanced sensors detect process temperature changes in real time and automatically calculate the corresponding change in the wet gas fl ow rate. They are free of lag effects because they are inherently multi-variable, providing both the fl ow and temperature data necessary for accurate measurement.
The insertion style ST100A Flow Meter is ideal for wet gas measurement in larger line sizes with standard adjustable insertion lengths from 1 inch/25 mm up to 60 inches/1,524 mm. It sets an industry benchmark in process and plant air/gas fl ow measurement, offering the most feature- rich and function-rich electronics available for versatility and installed value.
Whether the need is for 4-20 mA analogue, frequency/pulse, alarm relays or digital bus communications such as HART, Profi bus or Modbus, the ST100A Flow Meter is the perfect data communication solution in wet gas measurement. Should a plant’s needs change over time or an upgrade be desirable, the ST100A Meter adapts as necessary with a plug-in card replacement that can be changed out by plant technicians in the fi eld.
The ST100A Flow Meter’s unique graphical, multivariable, backlit LCD display/readout brings new meaning to the term “process information” for local viewing of wet gas fl ow data. It provides the industry’s most comprehensive information with continuous display of all process measurements and alarm statuses, and the ability to interrogate for service diagnostics.
The rugged ST100A Meters are suitable for service up to 850ºF (454ºC) and are available with integral or remote electronics (up to 1000 feet [300 meters]). They are agency approved for hazardous environments, including the entire instrument, the transmitter and the NEMA 4X/IP67 rated enclosure. In addition to SIL-1, approvals include ATEX, IECEx, FM and FMc.
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Teledyne FLIR has announced the launch of the FLIR Cx5, a new pocket-portable thermal camera for condition monitoring in hazardous environments. The FLIR Cx5 has a rugged ATEX-compliant case, which allows users of this camera to safely monitor electrical or mechanical assets in hot working zones.
Potentially explosive environments, such as oil and gas plants or chemical plants, need to be protected from ignition sources. That’s why electronic devices used in these hot work environments need to comply with ATEX
or similar regulations (e.g. UKEX and IECEx). The 160 x 120-pixel FLIR Cx5 is mounted in a rugged enclosure, which enables users to work confi dently while maintaining safety.
“In hazardous environments, it’s critical for surveyors to be able to detect problems fast, so they can react accordingly,” says Michael Deruytter, Sr Director Product Manager at Teledyne FLIR. “The FLIR Cx5 is not only explosion-proof, but it’s also compact and very easy to use. This allows maintenance professionals to always have their camera at hand, fi nd hidden issues quickly and reduce diagnostic time.”
The FLIR Cx5 camera has all the ruggedized features that will enable it to survive the toughest day on the job. The FLIR Cx5 case has shock absorbers and the lens is protected by a Germanium window with anti-refl ective coating. The 3.5-inch colour display is protected by armoured glass and is touchscreen compatible. A rugged lanyard point can be removed in safe environments to reach the data storage and charging port.
The FLIR Cx5 features a FLIR Lepton® imaging sensor and FLIR-patented MSX®
thermal (Multi-
Spectral Dynamic Imaging) technology, which embosses visible scene details onto thermal images. This results in a crisp thermal image, enabling inspectors to pinpoint hidden problems instantly.
FLIR Cx5 is compatible with FLIR Ignite, a secure cloud storage solution that allows users to directly upload, edit, organise and share their images. With all images and videos in one place, sharing data with team members and creating reports for customers is convenient and simple. FLIR Cx5 users can also rely on the FLIR Thermal Studio software to fi netune their images and create professional reports.
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PIN Annual Buyers’ Guide 2023
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New, compact thermal camera for use in hot working zones
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