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| Parameter | |
| Max.voltage | 250VAC |
| Max.current | 1A(50VA) |
| Mode of connection | Direct connect |
| Output | SPST magnetic switch(factory configure the N/O) |
| Pressure | 25bar,custom-made 40bar |
| Average pressure loss | 0.01bar at Q.max |
| Working temperature | -20℃~90℃ |
| Protection class | IP65 |
| Body material | Nickel plated brass |
| Paddle material | stainless steel |
| Seal material | PTFE |
Brass nickel plated flow switch sensor magnetic for water pump

Application
It is mainly applicable to industrial automation/mechanical equipment/air compressing industry/refrigeration and air-conditioner.The magent not contact with flowing water,so can normally work in sewage discharging system.

| Parameter | ||||||
| Pipe diameter | Model | Flow range(L/Min) | Max flow(L/Min) | A(mm) | B(mm) | C(mm) |
| DN16 | WFS21016BG | 5.8(4.9)~7.8(6.6) | 20 | 22 | Φ16.2 | 40 |
| DN20 | WFS21020BG | 9.0(7.7)~12.2(10.4) | 40 | 24 | Φ19.4 | 45 |
| DN22 | WFS21022BG | 10.9(9.3)~14.8(12.6) | 45 | 25 | Φ22.5 | 55 |
| DN25 | WFS21025BG | 14.1(12.0)~19.1(16.2) | 60 | 27.5 | Φ25.7 | 55 |
| DN28 | WFS21028BG | 17.7(15.0)~24.0(20.4) | 68 | 28.5 | Φ28.9 | 57 |
| DN32 | WFS21032BG | 23.1(19.7)~31.3(26.6) | 80 | 32.8 | Φ32.3 | 54 |
| DN35 | WFS21035BG | 27.7(23.5)~37.4(31.8) | 88 | 34.4 | Φ35.3 | 66 |
| DN40 | WFS21040BG | 36.1(30.7)~48.9(41.5) | 100 | 35.4 | Φ40.3 | 81 |
| DN42 | WFS21042BG | 39.8(33.9)~53.9(45.8) | 105 | 35.4 | Φ42.3 | 81 |
In flow range,outside the brackets is the action flow point,inside is the reset flow point.


| Selection table | |||||
| WFS21 | 016 | B | G | /1M | Detailed |
| WFS21 | WFS21 Series | ||||
| 016 | Connection thread:DN16 | ||||
| 020 | Connection thread:DN20 | ||||
| 022 | Connection thread:DN22 | ||||
| 025 | Connection thread:DN25 | ||||
| 028 | Connection thread:DN28 | ||||
| 032 | Connection thread:DN32 | ||||
| 035 | Connection thread:DN35 | ||||
| 040 | Connection thread:DN40 | ||||
| 042 | Connection thread:DN42 | ||||
| B | Body material:Nickel plated brass | ||||
| G | Interface Type:Copper tee | ||||
| /1M | Wiring:1M(According to demand) | ||||
| Quantity(Piece) | 1-100 | >100 |
| Est. Time(days) | 7 | To be negotiated |






24 hours online service
- Enquiry will be replied in 2 hours.
- Three years warranty.
- Lead time is very quick , stock or no more than 5 working days .
1.Are you a manufacturer?
We have our own factory.We have lab to test all the function of production, to make all the material and production good quality.
2.What is the shipping port?
We ship the goods FOB Shanghai port.
3.How can I get your quotation?
Please let me know the product details you need, your purchase quantity and other requirement, etc print. We will provide the quotation according to your request as soon as possible.
4.What is your delivery time?
The time of delivery is 25-30 days.
