เครื่องวัดอัตราการไหล Mass Flow Mete

ST98 Mass Flow Meter for Air and Gases
Mass Flow Meter SummaryThe ST98 insertion-style mass flow meter is the flow measurement solution for virtually any gas or gas mixture in line sizes from >2 inches up to 42 inches [50mm to 1066mm].¹ With ST98, FCI combines superior, equal mass thermal-dispersion flow sensing elements and precision electronics with exacting actual fluid calibration and a choice of rugged, industrial enclosures to deliver accurate, highly repeatable flow measurement and long lasting service for the most demanding processes.

Note 1: For line sizes 2 inches [50mm] and smaller, see Model ST98L in-line style.

> Features
Direct Mass Flow Measuring		No Moving Parts
Flow, Total Flow, and Temperature		No Scheduled Maintenance
Gas Temperatures to 850ºF [454ºC]		All Welded Wetted Parts
Integral and Remote Electronics Versions		Rugged, All Metal Enclosures
Extensive Global Agency Approvals		HART and Profibus Comm’ Options

Specifications

• Flow Range: 0.75 to 600 sfps [0.21 to 172 nmps]
  (Air at standard conditions of 70º F and 14.7 psia [0ºC and 1013,25 mBar(a)].)
• Accuracy : (at calibrated conditions)
  Flow: ± 1% reading + 0.5% full scale.
  Temperature: ± 2º F [± 1º C]
  
• Temperature Coefficient:
  With optional temperature compensation. Valid from 10% to 100% of full-scale calibration
  Flow: Maximum ± 0.015% of reading/ºF up to 850ºF [±0.03% of reading/ºC up to 454 ºC]
• Repeatability:
  Flow: ± 0.5% reading
  Temperature: ± 1º F [± 0.6º C]
• Turndown Ratio: Factory set and field adjustable from 10:1 to 100:1 within the calibrated flow range.
• Temperature Compensation:
  Standard: ± 30º F [± -1º C]
  Optional: ± 100º F [± 38º C]
• Agency Approvals: FM, ATEX, IEC, CSA, CRN, GOST/RTN, NEPSI, CPA, PED, CE Mark (system approvals)
• Calibration: N.I.S.T. Certified and Traceable Test Lab Calibration
• MTBF (calculated): 110 Years

Flow Element

• Materials of Construction: All welded 316L stainless steel or Hastelloy C for all wetted surfaces.
• Process Connection:
  Standard: 0.75 or 1 inch male NPT stainless steel compression fitting with adjustable Teflon ferrule rated up to 150 psig [10 bar (g)] and 200ºF [93ºC], or metal ferrule rated up to 250 psig [17 bar (g)] and 350ºF [177ºC].
  Optional: Thread-on ANSI or DIN flanges, or retractable sensing element.
• Insertion Lengths (Field Adjustable):²
  1 to 6 inches [25 to 152 mm]
  1 to 12 inches [25 to 305 mm]
  1 to 21 inches [25 to 533 mm]
  Customer specified fixed lengths are available. Consult FCI.
• Operating Temperature (Process):
  Standard: -40º to +350º F [-40º to +177º C]
  Optional high temp: -100º to +500º F [-73º to +260º C];
  Optional ultra-high temp: -100º to +850º F [-73º to +454º C];
• Operating Pressure: To 250 psig [17 bar(g)]; de-rated with Teflon ferrule.

Flow Transmitter

• Operating Temperature: 0º to 140º F [-18º to +60º C]
• Input Power (Field Selectable): 85 to 265 Vac, 22 to 30 Vdc; 7 watts max; 230mA max.
• Outputs:
  Analog output: 4 to 20 mA, 1-5Vdc, 0-5Vdc, or 0-10Vdc. user selectable.
  (mA: 700 ohm max. load; output per NAMUR guideline NE 431, field selectable for high =21.6mA or low =3.75mA. Isolated from input power in AC powered mode only.) (Vdc 100K min. load.)
  Digital Communications:
  RS-232C Serial I/O standard.
  Options: HART, full two-way; Profibus, DP, profile 3, certification #Z01212
• Digital Display: Optional LCD, 2 lines by 16 characters per line. Indicates flow rate and process temperature or totalized flow (field selectable) with engineering units displayed.
• Remote Configuration: Transmitter may be mounted up to 1000 ft. [350 m] from flow element.
• Enclosure Options:
  
  • NEMA 4/IP66 rated carbon steel box, approved for installation in Nonincendive Class I, Div.2, Groups A,B,C,D and suitable for Class II, Div.2 Groups F, G; Class III, Div. 2.
  • NEMA 4X/IP66 rated aluminum box, approved for installation in Nonincendive Class I, Div.2, Groups A,B,C,D and suitable for Class II, Div.2 Groups F, G; Class III, Div. 2.
  • Hazardous location, Ex-type aluminum, approved for installation in Class I, Div.1, Groups B,C,D,E,F,G; ATEX II2, GD, Exd IIC, T4.

Other Options and Accessories

• Model FC88: Field Programmer/Communicator. Hand-held plug-in interface used to perform instrument set-up, programming, and for trouble-shooting.
• VORTAB® Flow Conditioners: For use in piping installations with inadequate straight run, inline or out-of-plane elbows, control valves or any other obstructing configurations to improve flow meter performance.

Note 2: After installation, stainless steel ferrule will be permanently fixed at the installed length.