FLocorp CalFlo™ CFNF1 AC Thermal Mass Air Flow Switch


FLocorp CalFlo™ CFNF1 AC Thermal Mass Air Flow Switch features solid-state switching and is extremely reliable even under the harshest environmental conditions. The CFNF1 features a repeatable alarm, an adjustable set-point from 3 to 32 feet per second, and 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™ CFNF1 AC Features and Benefits

  • Compact air flow switch with rugged Stainless Steel or plastic Ultradur construction
  • High accuracy with NO moving parts
  • Available in 110 VAC or 220 VAC 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 CFNF1-_-U: 15 psi (1 bar)
CFNF1-_-S: 150 psi (10 bar)
Hysteresis ≤ 30%
 Switching Delay Min. 3 s/ Max. 100 s (depends on set-point
Temperature Drift < 0.5% / K
 Supply Voltage CFNF1-1: 110 VAC
CFNF1-2: 220 VAC
Voltage Tolerance ± 10%
Switching Current 200 mA max.
Repeatability < 3%
Consumption Approx. 1W
Starting Override Time  Max. 90 s
Output Thyristor Normally Open (closed with flow), Thyristor Normally Closed (open with flow)
Display LED for ON or OFF state
Process Temperature F: -4º to 160º C: -20º to 70º
Ambient Temperature 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 CFNF1-_-U: 0.3 lbs (130 g)
CFNF1-_-S: 0.4 lbs (200 g) without nut
Cable Jacket Material  Oilflex
Cable Length 6.5’ (2m)

Ref: Flo-corp.comDownload Datasheet: CalFlo™ CFNF1 AC Thermal Mass Air Flow Switch

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