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)
|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)
|Min. 3 s/ Max. 100 s (depends on set- point adjustment)|
|Temperature Drift||< 0.5% / K|
|Supply Voltage||24 VDC ±10%|
|Switching Current||500 mA max.|
|Starting Override Time||
Max. 90 s
|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||
|Cable Length||6.5’ (2m)|
Download Datasheet: CalFlo™ CFNF2 DC Thermal Mass Air Flow Switch