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)

Specifications

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)
Pressure	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)
Weight	CFNF2-S: 0.4 lbs (200 g) without nut
Cable
Cable Jacket Material	Oilflex
Cable Length	6.5’ (2m)