FB20 Series

FB20 is a mechanical flow switch, switching is achieved through a magnetically-coupled reed switch which is hermetically isolated from the medium. The device operates through use of a paddle which is pivoted out of the fluid system by flow pressure.


  • Lower pressure drop
  • Good repeatbility
  • Totally separated mechanical parts and electrical parts
  • One switch is suitable for multiple pipe size - 5 paddles are included by default


Measuring Range: Refer to data sheet below for details
Repeatability: ±2.5% of measuring range
Electrical Connection Terminals
Output: Mechanical switch, NO / NC (250VAC,3A)
Pressure Rating: 16 bar
Pressure Drop: 0.08bar (With Max. flow rate)
Ambient Temp.: -25…80℃
Medium Temp.: -25…90℃
Connection Thread: NPT1"
Protection Class: IP33
Materials: Body: Stainless Steel
Process Connection: Brass
Paddle: Stainless Steel
Sealing: NBR
Housing: ABS