Fluid Components International Mass Flow Meter, ST51/ST51A
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ST51/ST51A Mass Flow Meter

Brand: Fluid Components International LLC (FCI)
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Fluid Components International Mass Flow Meter, ST51/ST51A
The ST51 Series Flow Meter is an accurate, easy to install, no moving parts solution for measuring and controlling biogases, digester gases, methane and natural gas flow. 

ST51 utilizes FCI proven thermal dispersion technology to provide direct mass flow measurement resulting in higher performance than orifice plates, DP, Vortex shedding and other thermal devices. The ST51 Series installs in line sizes ranging from 2" to 24" (51 to 610 mm) with 1/2" or 3/4" NPT. 

The ST51 uses precision, lithography structured platinum RTD sensors embedded in FCI’s equal mass small diameter thermowells. Combined with microprocessor electronics and precision calibration, the ST51 achieves excellent accuracy, fast response and virtually maintenance free operation.
Features
  • Triple outputs - Dual 4-20 mA Analog, pulse for totalizer
  • HART I/O (Model ST51A)
  • No moving parts, non-clogging
  • Dual line, rate and totalizer, digital display
  • Small, compact design
  • Easy to install
  • Hazardous location approved
  • Integral and remote mount
  • SIL compliant

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Specifications

Brand

Accuracy

  • ± 1 % of Reading, ± 0.5 % of Full Scale
  • ± 2 % of Reading, ± 0.5 % of Full Scale

Applications

  • Biogas Production & Recovery: Anaerobic Digester Processes, On-Farm Systems, Fermentation Systems
  • Coal Mine & Coal Bed Methane Recovery
  • Co-Gen Power Systems
  • Landfill Gas Recovery Systems
  • Wastewater Treatment Plant Digester Systems

Approvals & Certifications

  • SIL 1 Compliant, Safe Failure Fraction (SFF) 78.5 % to 81.1 % for ST51A
  • ISO 9001
  • AS 9100
  • ATEX: Zone 1, Zone 21, II 2 G Ex db IIC T6 to T1 Gb, II 2 D Ex Tb IIIC T85° C to T300° C Db, IP66/IP67, Ta = -40° to 65° C
  • CE
  • CRN
  • CSA: Non-Incendive Class I, Div. 2, Groups A, B, C, D, T4 Ta = 60° C Indoor Hazardous (Classified) Locations
  • EAC TR CU Russia
  • FM, FMc: Class I, Div. 1, Groups B, C, D, T4 Ta = 60° C, Class II/III, Div. 1, Groups E, F, G, T4 Ta = 60° C, Typical 4X/IP66, Class I, Div. 2, Grade A, B, C, D, T4 Ta = 60° C
  • IECEX: Zone 1, Zone 21, II 2 G Ex db IIC T6 to T1 Gb, II 2 D Ex Tb IIIC T85° to T300° C Db, IP66/IP67, Ta = -40° to 65° C

Cable Length

  • 1 to 100 feet (30 metres) for ST51A
  • 1 to 50 feet (0.3 to 15 metres) for ST51

Communication

  • HART (Version 7), FieldComm Group Certified for ST51A
  • RS-232C

Compensated Temperature

  • -18° to 121° C (0° to 250° F)

Conduit Connection

  • 1/2” NPT Female
  • M20 x 1.5 Female

Display

  • Two-Line x 16-Character LCD: Digital Display

Enclosure, Body Material

  • 316 Stainless Steel
  • Aluminum

Environmental Protection

  • IP66
  • IP67
  • NEMA 4X

Flow Rate

  • 0.3 to 400 sfps (0.08 to 122 mps)

Frequency

  • Output Signal: 0 to 500 Hz Pulse for Total Flow

Input Power

  • AC: 85-265 Vdc (12 W, Max.
  • CE Marking Approval: 100-240 Vac
  • DC: 18-36 Vdc (6 W, Max.

Insertion 'U' Length

  • Field Adjustable Length: 1” to 18” (25 to 457 mm)

Materials of Construction

  • Compression Fitting: 316 Stainless Steel
  • Ferrule: Stainless Steel
  • Ferrule: Teflon

Media

  • Air: Compressed Air, Nitrogen
  • Gas: Biogas, Digester Gas, Methane, Natural Gas

Mounting

  • Integral with Sensor Element
  • Remote Mounting

Mounting Position

  • Horizontal Top or Side Mount
  • Vertical Side Mount

NPT Connection

  • 1/2” NPT Male
  • 3/4” NPT Male

Operating Pressure

  • psig: 150 (kPa: 1,030, bar: 10) - Max.
  • psig: 500 (kPa: 3,400, bar: 34) - Max.

Operating Temperature

  • Stainless Steel Ferrule: -18° to 121° C (0° to 250° F) - Max.
  • Stainless Steel Ferrule: -18° to 177° C (0° to 350° F) - Max.
  • Teflon Ferrule: -18° to 93° C (0° to 200° F) - Max.
  • Transmitter: -18° to 60° C (0° to 140° F)

Output

  • Dual 4-20 mA Analog Output

Output Function

  • Fault Indication Per NAMUR NE43 Guidelines, User Selectable for High (> 21.0 mA) or Low (21.0 mA) or Low (21.0 mA) or Low (21.0 mA) or Low (21.0 mA) or Low (21.0 mA) or Low (21.0 mA) or Low (21.0 mA) or Low (< 3.6 mA) for ST51A

Pipe Size

  • 2” to 24” (51 to 610 mm)

Principle of Operation

  • Thermal, Calorimetric

Repeatability

  • ± 0.5 % of Reading

Sensor, Probe Material

  • 316 Stainless Steel
  • Thermowell Sensor: Hastelloy C

Sensor, Probe Type

  • Platinum RTD

Temperature Coefficient

  • Flow: ± 0.015 % of Reading/°F up to 350° F (± 0.03 % of Rreading/°C up to 177° C)

Turndown

  • 3:1 to 100:1

  • Wastewater Treatment Plant Digester Systems
  • Biogas Production and Recovery
  • Anaerobic Digester Processes
  • On-Farm Systems
  • Fermentation Systems
  • Landfill Gas Recovery Systems
  • Co-Gen Power Systems
  • Coal Mine and Coal Bed Methane Recovery

Documentation

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