Flocorp CalFlo™ CFNF2 DC Thermal Mass Air Flow Switch


Flocorp CalFlo™ CFNF2 DC features solid-state switching and is extremely reliable even under the harshest environmental conditions. NitroFlo features a repeatable alarm, an adjustable set-point from 3 to 32 feet per second, and an LED indication of flow.

The short housing is intended for use in pipe sizes ½” to 1 ½” in diameter and the long housing is recommended for pipe sizes 2” and up. Typical applications include air conditioning, ventilation, air filter monitoring, extraction fans, blowers, damper regulators, and energy conservation systems.

Flocorp CalFlo™ CFNF2 DC Features and Benefits

  • Compact flow switch with rugged Stainless Steel or plastic Ultradur construction
  • High accuracy with NO moving parts
  • 24 VDC power supply
  • Set-point adjustable between 3 fps and 32 fps
  • Temperature independent
  • Easy installation with mounting flange (included)


Service Compatible Gasses
Switching Range 3 to 32 fps (1 to 10 mps)
Factory set-point 10 fps (3 mps)
Pressure CFNF2-U: 15 psi (1 bar)
CFNF2-S: 150 psi (10 bar)
Hysteresis ≤ 30%
 Switching Delay Min. 3 s/ Max. 100 s (depends on set- point adjustment)
Temperature Drift < 0.5% / K
Supply Voltage 24 VDC ±10%
Residual Ripple 20%
Switching Current 500 mA max.
Repeatability < 3%
Consumption Approx. 1W
Starting Override Time  Max. 90 s
 Output PNP Normally Open (closed with flow) PNP Normally Closed (open with flow) NPN Normally Open (closed with flow) NPN Normally Closed (open with flow)
Display LED for ON or OFF state
Process Temp. F: -4º to 160º C: -20º to 70º
Ambient Temp. F: -4º to 160º C: -20º to 70º
Enclosure Rating NEMA 4 (IP64)
Housing Material Ultradur (PBTP) or Stainless Steel
Sensor Material Ceramic with Over Glaze
Weight CFNF2-U: 0.3 lbs (130 g)
CFNF2-S: 0.4 lbs (200 g) without nut
Cable Jacket Material  Oilflex
Cable Length 6.5’ (2m)

Download Datasheet: CalFlo™ CFNF2 DC Thermal Mass Air Flow Switch

Ref: Flo-corp.com

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