CalFlo™ CFNF2 DC Thermal Mass Air, Flocorp-Flow Switch

The CalFlo series of calorimetric flow switches offer units with several features including temperature & flow, compact relay control, strobe alert, adjustable flow, compact airflow, inline airflow, and more. The wide variety of options available enable us to provide the right unit for your specific application. If you need help selecting the correct flow switch, our team is happy to assist in the selection process.

This industrial purpose flow switch is a great choice for monitoring a variety of air or gaseous applications. The CalFlo™ CFNF2 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.

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) 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
Cable Jacket Material	Oilflex
Cable Length	6.5’ (2m)

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

Ref: Flo-corp.com