16 Flow Level Pressure
Air/Gas Mass Flow Meter with Dual Averaging Offers Higher Accuracy for Large Pipes and Ducts
The future-ready new ST102A Air/Gas Thermal Mass Flow Meter from Fluid Components International (USA) features an advanced dual-element averaging system, improving installation repeatability and accuracy for larger diameter pipes and ducts.
Flow measurement applications involving line sizes 12 inches (305 mm) or greater can realise improved installation accuracy and repeatability by averaging the flow rates of two elements. Distorted, swirling and non-repeatable flow profiles can result in decreased accuracy of single point meters. It is often impractical or impossible to provide the required straight-run for a fully developed flow profile in large lines.
The new Model ST102A Flow Meter overcomes these flow profile concerns with a simple, economical dual-element averaging system. The transmitter electronics average the input from two independent flow elements into a single output. Each flow element can be independently configured for insertion length and process connection to allow installation flexibility. One flow
element can be integral with the flow transmitter, or both can be configured as remote for easier access and visibility to the digital display/optical four button user interface. The flow transmitter also provides independent information for each flow element, saving time when performing service checks.
FCI’s ST102A Flow Meter and the entire ST100 Series Flow Meter set a new industry benchmark in process and plant air/gas flow measurement, offering the most feature-rich and function-rich electronics available. Their performance delivers unsurpassed adaptability and value to meet plant gas flow measurement in large line applications for today and tomorrow.
Whether the need is for traditional analog outputs, or digital bus communications such as HART, Foundation Fieldbus, Profibus or Modbus, the ST100 Series is the solution. Should a plant’s DCS or PLC interface change over time or an upgrade be desirable, the ST102A Flow Meter adapts as necessary with a plug-in card replacement that can be changed out in the field.
The ST100 Series Flow Meter’s unique graphical, multivariable, backlit LCD display/readout brings new meaning to the term “process information”. It provides the industry’s most comprehensive information with continuous display of all process measurements and alarm status, and the ability to interrogate for service diagnostics.
The user-friendly ST100 Series Flow Meter stores up to five unique calibration groups to accommodate broad flowranges, differing mixtures of the same gas and multiple gases, and obtains up to 1000:1 turndown. Also standard is an on-board data logger with an easily accessible, removable 2-GB micro-SD memory card capable of storing 21 million readings.
The ST100 Series is the first thermal flow meter to offer three different types of flow sensors to best match user applications. The FPC-style features an integral flow conditioner and protective shroud optimized for compressed air and clean gas applications. The fast-response, general purpose FP-style features a protective shroud and is the sensor used with FCI’s VeriCal in-situ calibration option. For wet or dirty gases, or erratic flows, the unshrouded S-style facilitates easy cleaning and provides a smoothed response.
The ST100 Series can be calibrated to measure virtually any process gas, including moist gas, mixed composition gases and dirty gases. The basic insertion style air/gas meter features a thermal flow sensing element that measures flow 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.
Designed for rugged industrial processes and plants, ST100 Series is suitable for service up to 850ºF (454ºC) and are available with both integral and remote (up to 1000 feet [300 meters]) electronics versions. The ST100 is agency approved for hazardous environments, including the entire instrument, the transmitter and the rugged, NEMA 4X/IP67 rated enclosure. Instrument approvals include FM, FMc, ATEX, IECEx, InMetro, GOST, and NEPSI.
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New Flow Computer for More Intuitive Natural Gas Volume Conversion
RMG by Honeywell (USA) recently introduced the ERZ 2000-NG Flow Computer and Gas Volume Corrector, providing a reliable and more intuitive solution for natural gas volume conversion in fiscal and secondary metering applications.
Featuring a new graphical touch screen user interface, the new, flow computer enables gas distribution, transportation and storage service organisations to accurately measure gas flow, correct the measured volume, calculate energy consumption, and provides all data via standardised protocols. It is certified by the European Measuring Instruments Directive (MID) as a gas volume and calorific value corrector for custody transfer metering of natural gases. The unit can easily be integrated in a gas train application in a cabinet along with gas chromatographs, flow computers, data loggers and controllers.
The new intuitive human-machine interface (HMI) touch screen navigation can even be used by operators wearing gloves by using a touch pen. Remote maintenance software capabilities limit the number of on-site visits and reduce the time for commissioning and maintenance. In addition, an optional USB port allows the use of an external keyboard.
“The ERZ 2000-NG combines RMG by Honeywell’s proven reliability with a significantly improved user experience for operators in the field,” said Frank Michels, general manager, RMG Gas Metering.
The ERZ 2000-NG can be used in conjunction with all types of gas flow meters, including turbine meters, vortex meters, ultrasonic gas meters and rotary displacement meters, as well as orifice plate metering. The flow computer utilises a wide range of communication protocols to deliver data securely to supervisory control and data acquisition (SCADA), enterprise resource planning (ERP) or data collection systems. It also employs a pair of Ethernet plugs (RJ45) to communicate with separate IP networks, ensuring better overall system security and eliminating the influence from remote readings.
Designed as a universal instrument, the ERZ 2000-NG can be used for all metrological tasks in a gas metering station. It is available in a choice of system configurations, including: ERZ 2002-NG Density Volume Converter, ERZ 2004-NG State Volume Converter, ERZ 2104- NG State Calorific Value Volume Converter, ERZ 2102-NG Density Calorific Value Volume Converter and ERZ 2014/2114-NG Effective Pressure Gas Meter.
The ERZ 2000-NG performs gas volume conversion on the basis of the equation-of- state for ideal gases. Since this equation alone does not meet all the requirements for high- precision gas metering, the gas volume corrector also takes into account the characteristics of the real gas by using the K co-efficient as a correction factor. Such an approach ensures utmost measurement accuracy and repeatability. The device monitors limits specified for custody transfer metering. An alarm is tripped if these limits are exceeded, and all alarm messages are stored in a log, just like parameter changes.
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