Product Specifications
- Manufacturer
- Fox Thermal Instruments
- Product Number
- FT3
- Type
- Thermal Mass Flow Meter with Temperature Transmitter
- Turndown Range
- Typically 100:1
- Measured Variables
- Process gas flow rate and temperature
- Outputs
- Isolated 4-20 mA and pulse for flow; 4-20 mA for temperature (or second flow rate)
- Communication
- USB standard; Optional HART and RS485 Modbus
- Display
- Optional LCD 2 line, 16 character, backlit, Infrared (IR) buttons
- Calibration Validation
- CAL-V (in-pipe), Zero CAL-CHECK
- Power Input
- 24 VDC or optional 85-264 VAC
- Approvals
- FM/FMc, ATEX/IECEx Zone 1/2, Class I Div1/2, Class II/III Div1, NEMA 4X, CE
- Documents
- Product Manual, Product Specs
Product Description
The Fox Thermal FT3 mass flow meter and temperature transmitter measures two important process variables with a single instrument, providing isolated 4 to 20 mA and pulse outputs for flow rate, and a 4 to 20 mA 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. Its 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, igniters or dirty power may affect instrument performance.
The Model FT3's CAL-V feature is an in-situ calibration routine that validates the flow meter's calibration accuracy by testing the functionality of the sensor and its associated signal processing circuitry. This innovative approach lets you validate instrument calibration in your pipe, at your process conditions, with just a push of a button. At the conclusion of the test, the meter will display a pass/fail message and the CAL-V data is saved in the meter for look-up at any time. The Zero CAL-CHECK feature checks for build-up on sensor, validates zero stability, and checks thermal conductivity repeatability of the sensor.
Field selectable units include SCFM, NM3H, Kg/Hr and more. The 316 stainless steel sensor is standard with Hastelloy C276 optional. It features USB connection standard with free FT3 View Software, and optional HART and RS485 Modbus. The meter carries FM and FMc approvals, ATEX and IECEx approvals (Zone 1 and 2), Class I, Div 1, Groups B,C,D; Class I, Div 2, Groups A,B,C,D; Class II & III, Div 1, Groups E,F,G. It is indoor/outdoor NEMA 4X and CE approved.
Resources & Documentation
Thermal Mass Flow Meter - CAL-V, 100:1 Turndown | Fox Thermal FT3
Product Specifications
- Manufacturer
- Fox Thermal Instruments
- Product Number
- FT3
- Type
- Thermal Mass Flow Meter with Temperature Transmitter
- Turndown Range
- Typically 100:1
- Measured Variables
- Process gas flow rate and temperature
- Outputs
- Isolated 4-20 mA and pulse for flow; 4-20 mA for temperature (or second flow rate)
- Communication
- USB standard; Optional HART and RS485 Modbus
- Display
- Optional LCD 2 line, 16 character, backlit, Infrared (IR) buttons
- Calibration Validation
- CAL-V (in-pipe), Zero CAL-CHECK
- Power Input
- 24 VDC or optional 85-264 VAC
- Approvals
- FM/FMc, ATEX/IECEx Zone 1/2, Class I Div1/2, Class II/III Div1, NEMA 4X, CE
- Documents
- Product Manual, Product Specs










