Fox Thermal FT3-Gas Mass Flow Meter with Temperature Transmitter
Fox Thermal FT3-Gas Mass Flow Meter with Temperature Transmitter

Fox Thermal FT3-Gas Mass Flow Meter with Temperature Transmitter

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thermal mass flow meter

Fox Thermal Thermal Mass Flow Meter | Model FT3 Temperature Transmitter

The Fox Model FT3 measures two important process variables with a single instrument, providing isolated 4-20mA and pulse outputs for flow rate, and a 4-20mA pulse output for process gas temperature or a second flow rate output.

Direct mass flow measurement, exceptional low-flow sensitivity, fast response, and low maintenance requirements distinguish the Fox Model FT3. Virtually immune to changes in temperature and pressure, the flow meter delivers repeatable, accurate mass flow measurement under varying loads.

It’s rugged, no- moving-parts design is also ideal for high-vibration industrial environments and enhanced EMI immunity makes it suitable for environments where electric motors, ignitors or dirty power may affect instrument performance.


Performance Specifications

Type Insertion Inline
Flow Accuracy: ± 1% of reading ± 0.2% of full scale.
15 diameters of straight, unobstructed pipe upstream and 10 downstream.
± 1% of reading ± 0.2% of full scale.
8 diameters of straight, unobstructed pipe upstream and 4 downstream.
Flow Repeatability: ± 0.2% of full scale
Flow Response Time: 0.9 seconds (one time constant)
Temperature Accuracy: ± 1.8°F (± 1.0°C) -40 to 250°F (-40 to 121°C); ± 3.6°F (± 2.0°C), 250 to 650°F (121 to 343°C); 60 SFPM minimum.
Calibration: Factory Calibration to NIST-traceable standards
CAL-V™ and Zero CAL-CHECK®: In situ, operator-initiated calibration validation

Operating Specifications

Type Insertion Inline
Flow Rates: 15 to 60,000 SFPM (0.07 to 280 NMPS) – Air at 70°F (20°C) & 1 ATM
Turndown: up to 1000:1; 100:1 typical
Flow Ranges:
Pipe Size SCFM NM³/Hr
0.25″ 0 – 7.5 0 – 11.8
0.5″ 0 – 125 0 – 200
0.75″ 0 – 220 0 – 350
1″ 0 – 360 0 – 570
1.25″ 0 – 625 0 – 990
1.5″ 0 – 840 0 – 1,325
2″ 0 – 1,400 0 – 2,210
2.5″ 0 – 2,000 0 – 3,150
3″ 0 – 3,100 0 – 4,890
4″ 0 – 5,300 0 – 8,360
6″ 0 – 12,000 0 – 18,930
Note: Standard conditions of the air at 70°F and one atmosphere.
Consult factory for other gases, pipe sizes, and flow ranges other than those listed.
Gas Pressure (max): 500 psig (34.5 barg) 316 SS inline w/NPT ends: 300 psig (20 barg)
316 SS inline w/150lb flanges: 230 psig (16 barg)
CS inline w/NPT ends: 300 psig (20 barg)
CS inline w/150lb flanges: 285 psig (20 barg)
Check with factory for higher pressure options.
Note: Pressure ratings stated for a temperature of 100°F (38°C).
Relative Humidity: 90% RH maximum; non-condensing
Temperature by Sensor Type: (see Approvals tab) ST Sensor: -40 to 250°F (-40 to 121°C)
HT Sensor: -40 to 650°F (-40 to 343°C)
Temperature by Enclosure: (see Approvals tab) Without display or AC power supply: -40 to 158°F (-40 to 70°C)
With display and/or AC power supply: -4 to 158°F (-20 to 70°C)
Remote sensor junction box: -40 to 212°F (-40 to 100°C)
Inputs Power:
  • 24 VDC (±10%), 0.7 Amps (standard DC Power) 100 to 240VAC ∼(+10%-15%), 50-60Hz, 0.2 Amps (with AC power option).

Note: Fluctuations of AC and DC power supply are not to exceed ±10% of rating.

Class I Equipment (Electrical Grounding Required for Safety).
Installation (Over-voltage) Category II for transient over-voltages

  • All outputs and communication circuits are galvanically isolated.
  • 4-20mA output one is proportional to the measured flow rate.
  • Fault indication per NAMUR NE43.
  • 4-20mA output two is programmable for temperature or flow rate.
  • Digital output one is programmable for either pulse (for totalizing flow) or alarms.
  • The output is open collector type, operating voltage 5V to 24V, maximum sinking current: 10mA.
  • The pulse output is proportional to flow rate with a range of 0 to 100Hz.
  • When configured for alarm, the digital output generates an on or off signal.
  • Remote switch input can be configured to reset elapsed time, flow totalizer or switch between gas curves when the 2 gas curve option is ordered.
Port: Mini USB communication port is standard.
Software: The free PC-based software tool – FT3 View™ – provides complete configuration, remote process monitoring, and data logging functions.
Optional serial communication: HART or Modbus RTU (RS485).
4-20mA Loop Verification: Simulation mode used to align 4-20mA output with the input to customer’s PLC/DCS.

Physical Specifications

Type Insertion Inline
Sensor Material: 316 stainless steel standard. Hastelloy C276 is optional.
Enclosure: NEMA 4X (IP68), Aluminum, dual conduit entries with ¾” NPT or optional M20 x 1.5mm.
Cabling to remote enclosure: 5-conductor, 18 AWG, twisted, shielded, 100 feet maximum.
Retractor Assemblies: Packing gland assembly: 125 psig (8.6 barg ) max.
High pressure (crank) retractor: NPT 600 psig (41.4 bar), ANSI 150 flange & ANSI 300 flange, no valve supplied.
Installation: Fox Thermal-supplied compression fitting connects to customer-supplied ¾” female coupling welded to the pipe. Compression fitting included with flow body.

More Information: Brochure FT3

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