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FCI Model ST51 Biogas & Natural Gas Insertion Thermal Mass Flow Meter
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FCI Model ST51 Biogas & Natural Gas Insertion Thermal Mass Flow Meter

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Models ST51 and ST51A are a compact, low cost solution for accurate, repeatable flow measurement of biogas, digester gas, landfill gas, methane and natural gas as well as air, compressed air or nitrogen. This insertion-style flow meter has no moving parts and is available in probe lengths for installation into pipe diameters from 2.5 inches to 24 inches [63 mm to 610 mm]. It is easily connected into the pipe via a 1/2 inch or 3/4 inch NPT compression fitting. ST51 uses constant power thermal dispersion drive technology, with a slightly heated sensor, which uniquely provides a subtle drying effect on the sensors that results in effective measurement in moist gas applications.
 
The ST51 Series electronics are housed in rugged, IP67 rated enclosure with dual conduit ports in either NPT or M20 threading. The instrument comes standard with dual 4-20 mA, NAMUR NE43 complaint outputs and a 500 Hz pulse output. The model ST51A adds HART or Modbus, a higher process temperature service range, a SIL compliance rating and extended warranty. The transmitter/electronics can be integrally mounted with the flow element (probe) or be remote mounted to best match your installation situation. The complete instrument carries global Ex agency approvals for Division l/Zone 1 installations.
 
The ST51 flow sensing element features precision, platinum RTD in small diameter, "equal-mass," all-metal thermowells to provide superior accuracy, repeatability and fast response.

  • Display Type
  • Power Supply
  • Electrical Connection
  • Pipe Orientation
  • Flow Direction
  • Mounting Orientation
  • Temperature
  • Gas Type
  • Enclosure Style
  • Mounting Style
  • Process Connection/Ferrule Material
  • Insertion Length (Maximum U-Length)
  • Gas Media & Range
  • Calibration
  • Transmitter Options
  • Cable Length
  • Agency Approvals
  • SS Tag Plate

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Product Datasheets

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Models ST51 and ST51A are a compact, low cost solution for accurate, repeatable flow measurement of biogas, digester gas, landfill gas, methane and natural gas as well as air, compressed air or nitrogen. This insertion-style flow meter has no moving parts and is available in probe lengths for installation into pipe diameters from 2.5 inches to 24 inches [63 mm to 610 mm]. It is easily connected into the pipe via a 1/2 inch or 3/4 inch NPT compression fitting. ST51 uses constant power thermal dispersion drive technology, with a slightly heated sensor, which uniquely provides a subtle drying effect on the sensors that results in effective measurement in moist gas applications.
 
The ST51 Series electronics are housed in rugged, IP67 rated enclosure with dual conduit ports in either NPT or M20 threading. The instrument comes standard with dual 4-20 mA, NAMUR NE43 complaint outputs and a 500 Hz pulse output. The model ST51A adds HART or Modbus, a higher process temperature service range, a SIL compliance rating and extended warranty. The transmitter/electronics can be integrally mounted with the flow element (probe) or be remote mounted to best match your installation situation. The complete instrument carries global Ex agency approvals for Division l/Zone 1 installations.
 
The ST51 flow sensing element features precision, platinum RTD in small diameter, "equal-mass," all-metal thermowells to provide superior accuracy, repeatability and fast response.

Specifications

Display Type Integral, Remote, Blind
Power Supply 85-265 VAC, 18-36 VDC
Electrical Connection Two 1/2" NPT Cable Entries, Two M20x1.5 Cable Entries
Pipe Orientation Horizontal, Vertical
Flow Direction Left -> Right, Right -> Left, Up, Down
Mounting Orientation Top, Side - Facing Up, Side - Facing Down, Left Side, Right Side
Temperature Standard: 40 to 100°F | 4 to 38°C, Extended Temperature: 0 to 250 °F | -18 to 121°C
Gas Type Biogas, Digester Gas, Natural Gas, Methane, Flue Gas, or Other Hydrocarbon Mixed Gases, Air, Nitrogen or Compressed Air
Enclosure Style [1] Blind/VDC/NPT, [2] Blind/VAC/NPT, [3] Integral/VDC/NPT, [4] Integral/VAC/NPT, [7] Remote/VDC/NPT, [8] Remote/VAC/NPT, [A] Blind/VDC/M20, [B] Blind/VAC/M20, [C] Integral/VDC/M20, [D] Integral/VAC/M20, [E] Remote/VDC/M20, [F] Remote/VAC/M20
Mounting Style [F] Horizontal/L-R/Top, [G] Horizontal/R-L/Top, [H] Horizontal/L-R/Side Up, [J] Horizontal/R-L/Side Up, [K] Horizontal/L-R/Side Down, [L] Horizontal/R-L/Side Down, [M] Vertical/Up/Left, [N] Vertical/Up/Right, [P] Vertical/Down/Left, [R] Vertical/Down/Right
Process Connection/Ferrule Material [1] 1/2" NPT, Compression Fitting, Teflon Ferrule, [2] 1/2" NPT, Compression Fitting, Metal Ferrule, [3] 3/4" NPT, Compression Fitting, Teflon Ferrule, [4] 3/4" NPT, Compression Fitting, Metal Ferrule, [5] 1/2" NPT, Retractable Packing Gland, Graphite Packing, [6] 1/2" NPT, Retractable Packing Gland, Teflon Packing, [7] 3/4" NPT, Retractable Packing Gland, Graphite Packing, [8] 3/4" NPT, Retractable Packing Gland, Teflon Packing
Insertion Length (Maximum U-Length) [1] 6"|152mm, [2] 12"|305mm, [3] 18"|457mm
Gas Media & Range [C] Customized: Air Equivalency Calibration 0.75 to 100 SFPS, 10-50 PSIA, [1] Natural Gas (>90% Methane), [F] Customized: Actual Gas, [A] Standard: Air/Nitrogen Calibration 1.25 to 125 SFPS, 10-50 PSIA, [D] Standard: Air/Nitrogen Calibration 4 to 400 SFPS, 50-165 PSIA, [B] Customized: Air/Nitrogen Calibration 0.75 to 150 SFPS, 10-50 PSIA, [E] Customized: Air/Nitrogen Calibration 2.5 to 400 SFPS, 50-165 PSIA
Calibration [0] Standard 2% Accuracy Calibration, [A] Standard 2% Accuracy Calibration & Extended Temperature Compensation, [M] High Accuracy 1% Calibration, [N] High Accuracy 1% Calibration & Extended Temperature Compensation, [Q] High Accuracy 1% Calibration w/ Vortab (VEL, VFK, VIS, VMR, or VSR), [5] High Accuracy 1% Calibration w/ Vortab (VIP), [T] High Accuracy 1% Calibration & Extended Temperature Compensation w/ Vortab (VEL, VFK, VIS, VMR, or VSR), [6] High Accuracy 1% Calibration & Extended Temperature Compensation w/ Vortab (VIP), [R] High Accuracy 1% Calibration & Flat Flow Profile, [U] High Accuracy 1% Calibration & Extended Temperature Compensation & Flat Flow Profile
Transmitter Options [0] Aluminum Housing w/ Dual 4-20mA Outputs, [A] Stainless Steel Housing w/ Dual 4-20mA Outputs, [A] Stainless Steel Remote Housing w/ Dual 4-20mA Outputs
Cable Length [0] Not Required, [A] 10ft|3m, [B] 25ft|7.6m, [C] 50ft|15m
Agency Approvals [1] FM, FMc, [0] CE Mark Only, [3] ATEX, IECEx
SS Tag Plate Without, [SST1] 2.50 x 0.75"|63.5 x 19.1mm; 2 Lines, [SST2] 2.50 x 0.75"|63.5 x 19.1mm; 3 Lines, [SST3] 2.50 x 1.50"|63.5 x 38.1mm; 6 Lines, [SST4] 3.00 x 1.50"|76.2 x 38.1mm; 6 Lines, [SST5] 3.40 x 1.85"|86.4 x 47.0mm; 6 Lines