Download Fox Flowmeter Technical Guide
± 1% of reading ± 0.2 % of full scale*
* Point velocity for insertion flowmeters. Fox recommends a minimum of 15 diameters of straight pipe upstream of the flowmeter and 10 diameters downstream for insertion flowmeters. Fox recommends a minimum of 8 diameters of straight pipe upstream of the flowmeter and 4 diameters downstream for inline flowmeters.
± 0.2% of full scale
Flow Response Time:
0.9 seconds (one time constant)
± 1.8° F (± 1.0° C) over -40 to 250° F (-40 to 121° C); ± 3.6° F (± 2.0° C) over 250 to 650° F (121 to 343° C). Minimum velocity 60 SFPM.a
Units of Measurement:
SCFM, SCFH, NM3/hr, NM3/min, Kg/hr, Kg/min, Kg/sec, Lbs/d, Lbs/hr, Lbs/min, Lbs/sec, NLPH, NLPM, SLPM, SMPS, NMPS, SFPM, MMSCFD
Flow Rates for Insertion Flowmeter:
0 to 32,000 SFPM (163 NMPS) - Air at 70F & 1 ATM
To determine if an Insertion Flowmeter will operate properly, divide the maximum flow rate by the pipe area. The application is acceptable if the velocity is within the velocity range above.
Gas Pressure (maximum):
500 psig (34.5 barg)
Note: Pressure ratings stated for temperature of 100°F (38°C).
Std sensor: -40 to 250°F (-40 to 121°C)
HS Sensor: 32 to 400°F (0 to 204°C)
HT Sensor: 32 to 650°F (0 to 343°C)
Enclosure: -40 to 158°F (-40 to 70°C) without display, 32 to 140°F, (0 to 60°C) with display
24 VDC, ± 10%, 0.75 amp standard
Two isolated 4 to 20 mA outputs (1 for flow & 1 for temperature); isolated pulse output 0 to 100Hz, 10 volts p/p for flow (the pulse output can be used as an isolated solid state output for alarms)
RS232 for connecting a Palm Handheld or computer; RS422/ RS485-Modbus, Profibus-DP, DeviceNet or Ethernet
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.
Remote enclosure: 5-conductor, 18 AWG, twisted, shielded, 100 feet maximum
Packing gland assembly: 125 psig (8.6 barg ) max. (See Figure 6)
High pressure (crank) retractor: NPT 600 psig (41.4 barg), ANSI 150 flange & ANSI 300 flange, no valve supplied. (See Figure 7)
Probe diameter: 1/2"
Equation for selecting Insertion Flowmeter probe length:
Probe length = ½ pipe ID (in inches) + 2" + thickness of insulation (if any) + dimension of retractor (if supplied). Round up to the next standard probe length available.