Thermal Mass Flow Meter
The Fox Model FT2A measures gas flow rate in standard units without the need for temperature or pressure compensation. It provides isolated 4-20mA and pulse outputs for flow rate, and a 4-20mA output for process gas temperature. The pulse output is normally used for totalization. With an on-board 2 line x 16 character, backlit display, operators can view flow rate, total, elapsed time, process gas temperature, and alarms. The display is also used in conjunction with the Configuration Panel to configure flow meter settings, pulse output frequency scaling, pipe area, zero flow cutoff, flow filtering (damping), display configurations, diagnostics and high or low alarm limits.
The Model FT2A is available in both insertion and inline models. The insertion meter is easily installed by drilling a ¾” hole in the pipe and welding on a ¾” NPT coupling. A Fox-supplied compression fitting secures the probe in place. The inline model is available in ¼-inch to 6-inch sizes and includes built-in flow conditioners that eliminate the need for long, straight pipe runs. The meter can be ordered with flange or NPT end connections. Both models are supplied with 316 stainless steel wetted materials standard or Hastelloy C-276 as an option (inline flow bodies also available in carbon steel). A USB port to connect to a computer or laptop is standard; interface options include Modbus RTU RS485), BACnet MS/TP (RS485), Profibus-DP, DeviceNet or Ethernet Modbus TCP.
Fox has certified cleaning and bagging procedures for flow meters to be used in oxygen applications.
|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|
|Flow Units (field selectable):||SCFM, SCFH, NMPS, NM3/M, NM3/H, NM3/D, NLPS, NLPM, NLPH, MCFD, MSCFD, SCFD, MMSCFD, MMSCFM, SMPS, SM3/H, LB/S, LB/M, LB/H, LB/D, KG/S, KG/M, KG/H, SLPM, SFPM, MT/H, SM3/M|
|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|
| Note: Standard conditions of 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: When teflon ferrule option ordered, gas pressure is 60psig (4.1 barg) maximum.
|Relative Humidity:||90% RH maximum; non-condensing|
|Temperature by Sensor Type:||ST Sensor: -40 to 250°F (-40 to 121°C)
HT Sensor: -40 to 650°F (-40 to 343°C)
|Temperature by Enclosure:||DC Power: -40 to 158°F (-40 to 70°C)
AC Power: -4 to 158°F (-20 to 70°C)
|Inputs Power (Power Consumption):||
Note: Fluctuations of AC and DC power supply are not to exceed ±10% of rating.
|Port:||Mini USB communication port is standard.|
|Software:||The free PC-based software tool – FT2A View™ – provides complete configuration, remote process monitoring, and data logging functions.|
|Optional serial communication:||Modbus RTU (RS485), BACnet MS/TP (RS485), Profibus-DP, DeviceNet or Ethernet Modbus TCP.|
|4-20mA Loop Verification:||Simulation mode used to align 4-20mA output with the input to customer’s PLC/DCS.|
|Sensor Material:||316 stainless steel standard. Hastelloy C276 optional.|
|Enclosure:||FM (U.S.) & FMc (Canadian) approved for Class I, II, III, Division 2, Groups A, B, C, D, E, F, G, T4A hazardous locations. NEMA 4X and CE approved. Options: Remote NEMA 4X electronics enclosure with explosion-proof sensor j-box.|
|Retractor Assemblies:||Packing gland assembly: 125 psig (8.6 barg ) max. High pressure (crank) retractor: NPT 600 psig (41.4 barg), ANSI 150 flange & ANSI 300 flange, no valve supplied.|
|Cabling to Remote Enclosure
||5-conductor, 18 AWG, twisted, shielded, 100 feet maximum.|
Fox Thermal-supplied compression fitting connects to customer-supplied ¾” female coupling welded to pipe.
Compression fitting included with flow body