MT100 Series Multipoint Thermal Mass Flow Meters

SKU: MT100

The MT100 Series is an insertion type, multipoint thermal flow meter specifically designed for large diameter pipes, such as stacks, industrial chimneys, and flues, and large rectangular ducts, such as air feed intakes and HVAC. These large pipe/duct applications are difficult for ordinary flow meters because of distorted flow profiles and lack of straight-run that can lead to inaccurate and non-repeatable flow measurement. FCI’s MT100 places up to eight (8) flow sensing points in the flow stream and averages them which results in a highly accurate and repeatable flow rate measurement. Unlike other large pipe flow meters, the MT100 has no moving parts or orifices to foul or clog. The insertion design, in the same plane, makes them an easy and lower cost solution to install.

There are solutions for use in fluid temperatures up to 850°F [454°C].  There are optional functions that are designed specifically to meet and comply with US-EPA  CEM’s and EU AMS per EN 15267 (QAL1) emissions monitoring and reporting regulations.  The electronics feature dual 4-20 mA outputs with HART and Modbus and, optionally Foundation Fieldbus or PROFIBUS, a best-in-class touch type, large digital + graphical LCD display, data logging, calibration self-checks and easy access to wiring. Transmitter enclosures are highest quality, corrosion resistant stainless steel.

The MT100 Series multipoint thermal flow meters are your solution for large diameter pipe and air ducts applications.


  • Brand


Fluid Components FCI


  • Combustion air
  • Stack gas flow
  • Primary, secondary and overfire air flow
  • Preheater air flow
  • Boiler air feed flow
  • Flue gas flow
  • Emissions flow monitoring/reporting (CEMS, AMS/QAL1)
  • HVAC Control


Flow Range: 0.25 SFPS to 1000 SFPS [0,07 NMPS to 305 NMPS] in air at standard conditions of 70°F [21,1°C] and 14.7 psia [1,01325 bar(a)].

Flow Accuracy (at calibrated conditions):  ±1.75% of reading, ±0.5% of full scale

Temperature Coefficient (Flow):

  • With optional temperature compensation; valid from 10% to 100% of full-scale calibration
  • Maximum ± 0.015% of reading/ºF up to 850ºF [± 0.03% of reading/ºC up to 454ºC]

Flow Repeatability: ± 0.5% reading

Temperature Accuracy: ± 2°F [°1°C]

Temperature Repeatability: ± 1°F [°1°C]

Turndown Ratio: Normally factory set from 2:1 to 100:1 within the calibrated flow range

Temperature Compensation: 

  • Standard: ± 30°F [± 16°°C]
  • Extended (Optional): ± 100°F [± 55°C]

Calibration: Performed using equipment traceable to NIST (US National Institute of Standards and Technology) and ISO/IEC 17025 international standards for test lab quality systems.

Agency Approvals:
Standard: CE Marking, CRN (pending, MT100S only)
FM/FMc:                    Class I, Division 2, Groups A, B, C, and D; Class II/III, Division 2,                                                  Groups E, F, and G

ATEX:                       II 3 G Ex nA IIC T6…T1 Gc
 (UKCA/UK-ATEX)           II 3 D Ex tc IIIC T85°C…T450°C Dc

IEC:                          Ex nA IIC T6…T1 Gc
(EQM/UCAS)                 Ex tc IIIC T85°C…T450°C Dc

Others:    EAC/TR CU, GOST metrology approved.

CEMS Compliance: (Optional)
US EPA CEMS: Complies with 40 CFR subpart 60 and subpart 75, Appendix A
AMS per EN 15267-3 (QAL1), EN 14181

Flow Element

Number of Flow Sensing Points per System: Up to 8 points total

Materials of Construction:
MT100M mast-type:

  • All welded
  • 316L stainless steel

MT100S single-point type:

  • All welded, 316L stainless steel; Hastelloy C-276 (optional)

Operating Temperature (Process):
MT100M mast-type:

  • -50°F to 500°F [-45°C to 260°C]
  • -50°F to 850°F [-45°C to 454°C]

MT100S single point-type:

  • -50°F to 500°F [-45°C to 260°C]
  • -50°F to 850°F [-45°C to 454°C]

Operating Pressure (Process): 
MT100M mast-type:
100 psig [6,9 bar(g)]; design pressure to 500 psig [34 bar(g)]

MT100S single point-type:

  • Metal ferrule 1000 psig [70 bar(g)]
  • Teflon ferrule 150 psig [10 bar(g)]
  • Fixed NPT 1000 psig [70 bar(g)]
  • Fixed flange per flange rating

Process Connections: 
MT100M mast-type:
2″ MNPT or 2″ [DN50] or larger flanges

MT100S single point-type:

  • Compression fittings: 3/4″ or 1″ male NPT, stainless steel with adjustable Teflon ferrule or metal ferrule; or flanged tapped and threaded for 3/4″ fitting.
  • ANSI or DIN flanges. (Compression fitting not available with 850°F/454°C temperature service versions.)
  • Retractable packing glands: Low pressure 50 psig (3,5 barg(g)] or medium pressure 500 psig [34 bar(g)] with graphite or Teflon packing material; 1.25″ male NPT or ANSI or DIN flange.
  • Fixed fittings: 1″ male NPT, ANSI flange, DIN flange


Flow Transmitter

Operating Temperature:  -40°F to 150°F [-40°C to 65°C];
                                           LCD readout’s operation restricted to -4°F [-20°C]. 

Input Power:
AC: 85 Vac to 240 Vac  (up to 4 points, 29W max; up to 8 points, 43W max.)
DC: 24 Vdc (19.2 Vdc to 28.8 Vdc) (up to 4 points, 17W max; up to 8 points, 26W max.)


  • Standard: Two (2) 4-20mA analog outputs, complaint with NAMUR NE43, output #1 with HART (version 7). 0-1KHz or 0-10kHz frequency or pulse. Modbus 485, USB, and Ethernet service port.
  • Optional: Foundation Fieldbus H1, PROFIBUS-PA

(Note: Only one bus communication can be operated at the same time.)

CEMS and AMS per EN15267 (QAL1) Compliance (Optional)User programmable for automatic test time and on-demand test of calibration drift test and interference test. Outputs a “PASS” or “ FAIL” on the LCD readout. In the event of fail, user can menu select diagnostics screen to see details on each flow element.

Includes two relay outputs, one changes state while in test mode and the other will change state if any test fails.

Display: (Optional) Large 7 inch [178 mm] color LCD with touch-screen. Provides digital readouts of flow rate, total flow, and temperature with engineering units; bargraph of flow rate and temperature; strip-chart of flow rate which is user programmable for time (minutes, hours, days). Also provides condition status of each sensor, alarm status, results of CEMS test (if so equipped) and user writeable field for process name, tag number, location, etc. User can use touch-screen buttons to access set-up and user programmable features, and diagnostics modes.

Data Logger:  On-board extractable MicroSD can store up to 80 million readings. Can log (date + time stamp) any combination of flow rate, totalized flow and temperature with engineering units and will record fault conditions. Data is stored in .csv format for easy uploading into spreadsheets and charts.

Transmitter/Electronics: Stainless steel, 12″ H x 10″ W x 6″ D [305 mm H x 254 mm W X 152 mm D] with hinged front door; NEMA4X/IP66 rated. Four 1″ NPT or M25 welded-in conduit ports at bottom of enclosure with wire entry/exit.

Local (MT100M): Stainless steel, 10″ H x 8″ W x 4″ D [254 mm H x 203 mm W X 102 mm D] with hinged front door; NEMA4A/IP66 rated. Two 1″ NPT or M25 welded-in conduit ports at bottom of enclosure. 

Local (MT100S): Enclosure used depends on process connection specified. Refer to product brochure and ordering guide (OIS).

Aluminum, ≤0.4% CU, low/no copper content*, polyester powdered coated (standard) or stainless steel (optional); NEMA4X/IP67 rated; two 1/2″ NPT or M20.1.5 conduit ports.
Aluminum, ≤0.4% CU, low/no copper content*,polyester powdered coated (standard) or stainless steel (optional); NEMA4X/IP67 rated; one 1″ NPT or M20.1.5 conduit ports.
(*2: Standard effective April 2023)


  • CE
  • FM/FMc
  • ATEX
  • IEC
  • GOST Metrology Approved
  • HART
  • AMS/QAL1 (EN 15267-3, EN 14181)
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