The QFS-400 flow switch is a real-time monitoring measurement instrument designed for accurately measuring liquid flow in pipelines. This flow switch is equipped with a full metal jacket and has no moving parts, ensuring reliable and long-lasting performance. The output of the flow switch is continuously adjustable, allowing for precise control of the flow rate. The compact structure of the flow switch makes it easy to install and suitable for various pipe diameters.

Featuring 6 LED indicators, this flow switch provides real-time display of the flow state and output, allowing for quick and easy monitoring. Its M12 connector ensures a secure and reliable connection, making it ideal for cross-border e-commerce platforms. With its wide range of applications, this flow switch is widely used in the hydropower and pipeline fluid flow monitoring industry.

Model: QFS-400
Range:1~150cm/s(water),3~300cm/s(oil),200cm/s~3000cm/s(gas)

No moving parts for reliable performance

Continuously adjustable output for precise control

6 LED indicators for real-time monitoring

M12 connector for secure and reliable connection

Wide range of applications in hydropower and pipeline fluid flow monitoring industry

Dimensions :( unit: mm)

Code Color NO.
Excitation - Brown 1
Excitation - Blue 3
Relay: Normally open White 2
Relay: Normally close Gray 5
Relay:COM BLACK 4
Transistor:NPN BLACK 4
Transistor:PNP BLACK 4

Measuring media dilute non-corrosive liquids(water,oil...)
Measuring ranges bar 1~150cm/s(water),3~300cm/s(oil)
Excitation voltage Vdc 24±20%VDC
Output signal Relay SPDT(≤250VAC/30VDC,3A)
Transistor NPN,PNP(≤24±20%VDC,1.2A)
Response time s 2s(1~15s)
Initialize time s 8s(2~15s)
Medium temp. C -20~80C
Environment temp. C -10~+70
Storage temp. -25~85°C
Consumption current mA <90mA
Overload pressure Mpa 10Mpa
Environment protection IP rating IP 67
Case Material 304 S
Material (wetted parts) 304 S

Installation 1. The wetted parts need to immersed in fluid.Installation in small diameter pipeline to ensure that the probe can't contact with pipe's inner wall.
2 .When the fluid can not completely fill the pipeline, products should be installed in the bottom of the pipe. (Figure 1)

3. If there may be sediment in the pipeline, please products installed in the pipeline side wall, horizontal mounting (Figure 2), to avoid the air and sediment

4.Installation in a straight pipe close to bend or intersection place, the pipe length should not be less than 4 times the diameter of pipeline.