12 Gas Detection
Detecting gas compressor fugitive methane leaks for safety and environmental compliance ) gas will fi nd the ST75 Series Thermal Mass Flow Meter from Fluid Components International
Engineers monitoring natural gas compressors for dry seal leaks of toxic, combustible methane (CH4
(FCI) provides them with precision CH4 costly gas leaks.
gas monitoring to detect hazardous, non-compliant and The compact ST75 Series Air/Gas Flow Meters offer accurate, repeatable CH4 measurements to
meet environmental regulations, making them the perfect choice for crowded equipment areas where gas monitoring and measurement are essential. They are direct mass fl ow measuring, producing fl ow rate and totalised fl ow output signals and readouts in pounds or tons (kg, tonne) of emitted gases for mandated monitoring and reporting.
The ST75 Flow Meter detects slight changes in fl ow, making it ideal for leak detection. Gas compressor stations commonly utilize dry gas seals that can be a source of fugitive methane emissions. Using a fl ow meter to monitor the primary and secondary vent gas on dry seals serves two purposes. An increase in vent gas can indicate the need for maintenance as the seal quality degrades. Secondly, the meter can quantify the amount of methane leaked into the environment, or sent to the fl are, for reporting of greenhouse gas emissions.
FCI’s ST75 Air/Gas Flow Meter is also suitable for small line, low fl ow measurements in applications in oil and gas industry’s production, processing, transportation and storage segments. It measures air or gases from 0.01 to 559 SCFM (0.01 to 950 NCMH) depending online size and actual process conditions. The ST75 is factory-calibrated and can provide a fl ow turndown range up to 100:1; surpassing the capabilities of other fl ow meter technologies.
With built-in temperature compensation, the ST75 Flow Meter offers highly repeatable performance in harsh industrial process environments. It features accuracy to ±2% of reading with ±0.5% repeatability over varying process temperatures and pressures in line sizes from 0.25 to 2 inches (6 to 51 mm). With an integral Vortab Flow Conditioner, the Models ST75V or ST75AV are ideal for installations with limited straight-run and/or for operating in the Reynolds Number transitional fl ow range with an accuracy of ± 1% reading, ± 0.5% full scale.
The ST75 Flow Meter’s fl ow sensor design is elegant in that it does not utilize any moving parts by employing platinum RTD sensors that are precision-matched and embedded in equal mass thermowells. This sensor design is less prone to fouling than other fl ow measurement technologies
when concerned with particulate-laden gas streams. In addition, there is minimal permanent pressure loss associated with the compact sensor design, making it more advantageous to use in low-pressure, low-fl ow applications than devices such as an orifi ce plate. This versatile instrument is suitable for mixed or single-process gases depending on the application. It is calibrated to NIST laboratory standards that ensure its performance.
Ideal for the oil/gas industry, the highly reliable ST75 Flow Meter features remote mounting for equipment in crowded hazardous areas or where the measurement point is not easily accessed. The remote mount transmitter, which has an option for local indication of fl ow, temperature and totalised fl ow, can be mounted up to 50 feet (15 meters) from the fl ow sensor in the process piping and has two 0.50- inch FNPT or M20 conduit connections for power and output wiring.
The ST75 Flow Meter’s standard scalable dual 4-20mA outputs are user-assignable to fl ow rate and/or temperature and have a 0-1kHz pulse output suitable for remote fl ow totalisation. The instrument can be confi gured for either 18 to 36 Vdc or 85 to 265 Vac input power, with or without a built-in, two-line indicating display (LCD). The ST75A version also includes either HART or Modbus RS485 (RTU or ASCII) communications. The microprocessor-based design also allows for self- diagnostics and features failsafe output confi guration per NAMUR NE43.
Offering high performance at an economical price, the ST75 or ST75A Flow Meter eliminates the need for additional pressure and temperature sensors, fl ow computers, or other devices that are required with orifi ce plates, Venturis, Vortex shedding, and other volumetric meters. It also requires virtually no maintenance for both a low installed and low life-cycle cost.
The FM/FMC approved ST75 Flow Meter is enclosed in an industrial grade, all-metal, dust and water resistant NEMA Type 4X (IP66) rated package designed for Class 1, Div 1/Div 2 hazardous area installations and includes a robust, all welded sensing element constructed with 316 stainless steel and Hastelloy-C tips. ATEX/IEC approvals include: Zone 1, II 2 G Ex d IIC T6 . . . T3; II 2 D Ex tD A21, IP67 T90º . . . T300º.
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NET was founded in 2002 with the mission of setting new standards in the gas sensor market: high quality, excellent technical support, competitive pricing and short delivery times. Nowadays, NET manufactures and sells a complete range of gas sensing solutions on an OEM basis for industrial and commercial applications preferred by instrument manufacturers worldwide.
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• The most complete range of NON-DISPERSIVE INFRARED (NDIR) SENSORS on the market today, including solutions for CO2 from ppm levels up to 100% volume, CH4 in explosive (%LFL) and 100% volume range, Propane and other hydrocarbons in explosive range (%LFL), SF6 in ppm range and over 40 different refrigerant gases in ppm and %LFL range.
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• A complete line of ELECTROCHEMICAL CELLS to detect various gases such as CO, C2 H4 , CL2 , H2 , H2 O2 , H2 S, NO, NO2 , NH3 , O2 , and SO2 .
• A strong range of CATALYTIC BEAD PELLISTORS for the detection of combustible gases in air or atmospheres containing oxygen up to the Lower Explosive Limit (LEL).
Plus, our Integrated Solutions are designed to upgrade and simplify the use of gas sensors on PLCs, controllers, monitoring systems and specialist gas detection systems alike:
• The NET CYBER TRANSMITTER BOARDS are Microprocessor driven electronic interfaces able to turn any gas sensor in a legitimate detector, with current, voltage and digital output, along with contacts for fault and user-programmable alarms.
• The NET CERTIFIED HEADS are a full range of ready–to–use detector heads or gas sensor housings, already certifi ed as a component or a complete device to be mounted on a gas detector in any environment.
• The REMORA SENSOR MODULES are the newest addition to our range. They are very cost effective, NDIR-based devices designed for the industrial HVAC industry and conceived to be integrated directly on refrigeration equipment.
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IET ANNUAL BUYERS’ GUIDE 2024/25
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Our offer starts at the core, with a comprehensive line of gas sensing elements:
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The most complete portfolio of gas sensing solutions on the market today
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