34 Air Monitoring Modbus now available on range of compact thermal mass air/gas flow meters


Process engineers who need to communicate flow measurement information over Modbus about air or gases flowing in line sizes from 0.25 to 24 inches (6 to 610 mm) will find the newly extended lines of ST51A and ST75A flow meters from Fluid Components International (FCI) provide the solution in a highly accurate, rugged, and compact instrument.


The new Modbus option for the ST51A and ST75A flow meters represents FCI’s continued commitment to providing optimal thermal mass flow meter design and value. They combine highly dependable surface-mount, lead-free RoHS compliant electronics with highly accurate, repeatable all-welded, equal-mass flow sensors. Their no-moving parts design is virtually maintenance free and offers an exceptionally long life.


FCI’s ST51A and ST75A flow meters’ Modbus option meets the EIA/TIA-485 standard and provides mass flow rate, totalised flow, and temperature data. Transmission mode is via RTU or ASCII with standard MS (16 bit), standard LS (16 bit) or Daniel extensions (32 bit). They’re ideal for use with single function PLCs, pilot plant projects or large SCADA systems or complex plant DCS systems.


In addition to Modbus, the ST51A and ST75A also provide dual 4-20 mA, NAMUR NE43 compliant, analogue outputs and a 500 Hz pulse output. Alternatively, instead of Modbus, the instruments can be provided with HART, version 7, I/O communications. The meters’ electronics are housed in a compact, rugged, IP67 rated, dual-conduit port (½ inch NPT or M20 metric threading) transmitter enclosure, which is available in aluminum or a 316L stainless steel version. The transmitter can be mounted directly to the flow sensor or remotely mounted up to 100 feet (30 meters) away.


The highly reliable ST51A, ST75A and ST75AV Flow Meters carry the CE mark, and are optionally available with Div.1/Zone 1 Ex agency approvals of FM, FMc, ATEX and IECEx. Additionally, they have also been independently verified to meet International Electrotechnical Commission’s (IEC) standard IEC 61508 for Safety Integrity Level (SIL-1) rating. With all these pedigrees and verifications, FCI is further able to extend a full 2-year warranty on these new models to all customers.


FCI’s thermal dispersion sensor technology applied in the ST51A and ST75A flow meters relies on the relationship between flow rate and cooling effect for direct measurement of mass flow. Their flow sensing elements feature precision, platinum RTDs in small diameter, all-welded thermowells made of 316L stainless steel and Hastelloy-C tips to provide superior accuracy, fast response and long-term reliability. These flow meters are direct mass flow measuring and require no additional temperature or pressure sensors or flow computer to infer the mass flow rate of the process media, which reduces the total cost of process flow measurement.


The ST51A is an insertion-style flow meter for use in pipe diameters from 2.5 to 24 inches [63 to 610 mm]. It is specifically designed for flow measurement of methane-based gases such as biogas, digester gas, landfill gas, natural gas, and for air, compressed air or nitrogen. It is easily connected into the pipe via a 0.5 or 0.75 inch NPT compression fitting. These thermal flow meters measure from 0.3 SFPS to 400 SFPS [0.08 MPS to 122 MPS] with turndown ratio of 100:1 and with accuracy of ±1 percent reading, ±0.5 percent full scale.


The ST75A flow meters are in-line (spool-piece) style designed for applications in smaller pipe diameters from 0.25 to 2 inches, [6 to 51 mm]. They measure flow rate and totalized flow of air, compressed air, inert gases as well as natural gas, biogas and other hydrocarbon-based gases which makes them ideal for burner-boiler fuel and air lines, industrial furnaces and kilns, chiller air flow metering, and dosing and gas injection.


Process connections options include male NPT, female NPT and ANSI or DN flanged. The Model ST75AV includes built-in Vortab® flow conditioning to ensure highest accuracy and repeatability in applications


which lack enough straight-run. They feature a wide 100:1 turndown ratio and measure from 0.01 SCFM to 559 SCFM [0,01 NCMH to 950 NCMH] with accuracy of ±1 percent reading, ± 0.5 percent full scale. More information online: ilmt.co/PL/kR6j


Upgraded visibility sensors ideal for the marine environmental applications


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Meteorological equipment specialist Biral is nowoffering its SWS range of visibility and present weather sensors with the added protection of hard anodising as an option. With this additional surface protection, the SWS range can be used in all shoreline and off shore applications, such as at ports and harbours, on lighthouses as well as on marine platforms and meteorological buoys. The SWS range is very


competitively priced and the anodised version is offered with a market leading five-year warranty.


The SWS-100 and SWS-050 are optimised for use in applications where accurate and reliable visibility measurements are required with the addition of fundamental WMO 4680 precipitation codes. The forward scatter design allows the sensor to be compact whilst the inclusion of serial, analogue and relay outputs makes these sensors easy to interface to any system.


The measurement of visibility by forward scatter as used by the SWS-100 and SWS-050 is now widely accepted and seen as having significant advantages over more traditional techniques such as the use of transmissometers or backscatter sensors. The SWS sensors are compact, very easy to install, require little maintenance and have a maximum visibility range of 10m to 75km for the SWS-100 and 10m to 40km for the SWS-050. The factory calibration of the SWS sensor family is undertaken in accordance with the recommendations of ICAO 9328 and is fully traceable to a highly respected national weather service transmissometer.


Visibility measurements are reported as Meteorological Optical Range (MOR). The reporting of atmospheric Extinction Coefficient (EXCO) can be selected by the user if required. The inclusion of hood heating and advanced self-test features as standard makes the SWS-050 Biral’s most cost effective solution for visibility measurement, and window contamination monitoring and compensation ensures the results remain accurate even in challenging conditions.


Present weather reporting in some applications is useful for finding out what is causing the reduction in visibility as this may fundamentally change the action to be taken by the user. The SWS-100 therefore has the ability to identify and report the presence of drizzle, rain and snow precipitation types using WMO Table 4680 codes. Fog, haze, and unidentified precipitation codes are also reported. The SWS- 100 is used by many global national weather services, including the United Kingdom’s MetOffice, as part of synoptic monitoring networks due to its wide measurement range, reliability and measurement accuracy. The SWS-100 and SWS-050 are very versatile sensors suited to a very wide variety of applications.


More information online: ilmt.co/PL/kR5o For More Info, email:


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50310pr@reply-direct.com IET September / October 2019 www.envirotech-online.com 49966pr@reply-direct.com


A perfect partner companion for petroleum refiners, gas manufacturers,


stack gas and DeNox plant operators ECO PHYSICS’ nCLD 822 Mh includes everything that is needed for measuring NO, NO2


, NOX and optionally NH3 in un-


preconditioned gas samples. Equiped with an enhanced detector-block, sample flow and pressure regulation, as well as temperature independence, the nCLD 800 instruments allow for even lower detection limits. Choose freely up to four measurement ranges within


5’000ppm, at a minimum detectable concentration of 0.12ppm. The integrated hot tubing enables the instrument to analyse hot and moist sources without external preconditioning. The calibration of the unit runs quickly and automatically, with all necessary data stored and available anywhere and at any time. The new touch sensitive graphical user interface “GUI“ enables the user to individually adjust the instrument operation and data management according to their requirements. The bright 8” monitor displays the values and the instrument’s performance in each, individual preferred way. Multiple digital in- and outputs guarantee a maximal connectivity for remote operation, control and maintenance of the nCLD 822 Mh, ensuring unsurpassed precision and reliability. The measurement principle will conform to the standard method for NOX-detection in stationary source emissions (EN 15267).


More information online: ilmt.co/PL/gnMJ For More Info, email:


made simple, safe and cost effective


The QAL1 certified, qLDX gas analyser, from SW Technology is a system for the continuous monitoring of NH3 and H2


Spectrometry (TDLS), the system has almost no cross- sensitivity with other gases and includes an innovative, patented measurement principle with no necessity for a physical reference-channel.


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This analyser has an extremely high sensitivity to the targeted gas with a very rapid response time. With functional safety, continuous status reporting, and a very user-friendly touch screen and navigation keyboard, the qLDX is not only safe and accurate – it is easy to operate. This analyser has a life expectancy of 10+ years and, with no replacement parts or calibration required, the cost of ownership is exceptionally low.


More information online: ilmt.co/PL/aDOJ For More Info, email:


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49861pr@reply-direct.com O gas. Utilising Tunable Diode Laser 50057pr@reply-direct.com Continuous NH3 and H2 O monitoring


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