Water flow switch Water pump flow sensor

Supply HT series “Water flow switch Water pump flow sensor” as introduced in the following chart,including Model HT-30,HT-60,HT-120,HT-200,HT-800,HT-801,HT-802,HT-2010,etc.We are professional to supply various of water flowing controlling switch,for more types or models,please send enquiry message to us.

The automatic on/off water flow switch for pump, also known as the inline water flow sensor switch and the water pressure switch, is an automatic switch controller that uses a magnetic induction device to control on-off of the circuit, thereby realizing the start or stop of the controlled pump. The water flow switch controller is not a water pump and it  itself does not have a pressure boosting function,must work by connecting circulation water pump to drive water to flow .

Thread can be1/2″,3/4″,1″,etc.Can stand high temperature 80℃-90℃.AC220V, DC12V, DC24V, DC48V,DC110V.No leaking. Support different pump power from 90W to 2000W.Also used for turn non-automatic pumps to become automatic pumps,applied to laser engraving machine, laser cutting machine, and other equipment with cooling system, circulation system,etc.Factory direct-sell. There are three types as following:

Standard type has following size available options:

• The power selected of the water flow sensor switch can not be less than the power of your water pump, you can buy a larger power switch. If the water pump is used in a hot water environment, it is recommended to buy an upgraded version which can support high temperature.
• Note that the start requirement of this water flow switch:
  1, the inlet pressure should be greater than 0.2bar (Kg);
  2, the water flow speed should be greater than 1.5L/min (LPM)

Water flow switch with adjustable flowing sensitivity are available size options as following:

• How to select the power water flow swich?  The power selected of the switch can not be less than the power of your water pump, you can buy a larger power switch. If the water pump is used in a hot water environment, it is recommended to buy an upgraded version which can support high temperature.
• How to operate water flow switch with sensitivity adjustabl? See below:

The sensitivity of the water flow switch is pre-adjusted when leaving the factory.They are suitable for most environments. Sometimes,if they are installed in special environments,they can not be used normally, then the sensitivity screw can be fine-tuned to achieve normal use.

When not starting, turn clockwise to the right and increase the sensitivity. When not stopping, turn counterclockwise to left to lower the sensitivity

Notice: When the faucet does not come out water, the sensitivity adjustment is no effect.

AC 0-110V use (current 0.2A)
12V, 24V; 48V DC water pump (must be equipped with relay for use)

In addition to the different internal controlling components, the most intuitive difference between the two types is whether there is a thermal insulation brass cap.
1. Normal temperature type: (0-40 ℃) can be used for a long time, and the maximum temperature in a short time should not exceed 60 ℃.
2. High temperature type:(0-80 ℃) can be used for a long time, and the maximum temperature in a short time should not exceed 100 ℃.
For heating pipes or solar pipes, please choose high temperature type.
Both types are good water-proof perofrmance,no leaking in long working time.

All switches are tested carefully and strictly before leave our factory,no leak,quality is assured!

Our factory manufactures high-quality inline type Water Flow Switch Water Pump Flow Sensor. They are suitable for various applications, including industrial processes, water treatment, irrigation systems, and more.

Our switches have the following features and benefits:

Accurate Flow Monitoring: Our Water Flow Switch Water Pump Flow Sensor provides precise and real-time flow monitoring, allowing you to have complete control over your water flow. This helps prevent any potential damage to your equipment and ensures optimal performance.

Durable and Reliable: Our flow sensor is made from high-quality brass, ensuring durability and long-lasting performance. It is designed to withstand even the harshest operating conditions, making it suitable for a wide range of applications.

Easy Installation: Our flow switches is inline type. It can be easily integrated into your existing water flow pip system, saving you time and effort.

We understand the importance of delivering products that meet the highest industry standards. Our quality control team meticulously tests each unit, ensuring that it performs flawlessly before it reaches your hands.And we offer competitive pricing, giving you the best value for your investment.

Order “Water flow switch Water pump flow sensor” in Smartclima today!

Wire diagram – how to wire a water flow switch

FAQ

1. What is a water flow switch, and what does it do?

A water flow switch (also called a water pump flow sensor) is an inline magnetic induction device that automatically starts/stops water pumps by detecting water flow in pipes. It converts water flow into an electrical signal to control pump operation, preventing dry runs and enabling automatic control for cooling/recirculation systems.

2. How does a water flow switch work?

It uses magnetic induction：water flow triggers an internal magnetic sensor, closing/opening the electrical circuit to start/stop the pump. It requires a minimum inlet pressure (>0.2bar) and flow rate (>1.5L/min) to activate. No water flow = circuit open (pump off); sufficient flow = circuit closed (pump on).

3. What applications is this flow switch suitable for?

Ideal for laser engraving/cutting machines, solar water heaters, heating pipes, industrial cooling systems, and recirculation pumps. It converts non-automatic pumps to automatic ones, supporting 90W–2200W pumps with AC220V, DC12V/24V/48V/110V compatibility.

4. How to choose the right flow switch model for my pump?

• Power rating: Select a switch power ≥ your pump’s power (e.g., 120W pump → 120W+ switch).
• Connection size: Match pipe thread (1/2”, 3/4”, 1”, 1.2”, 1.5”, 2”).
• Temperature: Normal (0–40℃, max 60℃) or high-temperature (0–80℃, max 100℃) for hot water systems.
• Sensitivity: Standard (fixed) or adjustable (for special environments).

5. Does it work with DC pumps, and what voltage options are available?

Yes. It supports DC12V/24V/48V pumps (requires a relay for DC use) and AC0–110V/220V pumps. DC models have 1/2”–1” connections and 2A max current; AC models cover 90W–2200W with 0.5A–5A current.

6. How to install a water flow switch correctly?

1. Install horizontally/vertically in straight pipe sections (avoid elbows/teees).
2. Match inlet/outlet thread (female inlet → male outlet) and ensure no leaks.
3. Wire in series with the pump and power source (follow the wiring diagram).
4. For high-temperature use, install the high-temperature model with a thermal insulation brass cap.

7. What’s the difference between normal-temperature and high-temperature models?

• Normal-temperature: 0–40℃ long-term use (max 60℃ short-term), no thermal insulation cap.
• High-temperature: 0–80℃ long-term use (max 100℃ short-term), with a thermal insulation brass cap for heating/solar pipes. Both are leak-proof and made of durable brass.

8. How to adjust the sensitivity of the adjustable flow switch?

1. Factory pre-adjusted for most environments; fine-tune only if needed.
2. Clockwise: Increase sensitivity (fix “not starting” issues).
3. Counterclockwise: Decrease sensitivity (fix “not stopping” issues).
4. Note: Adjustment has no effect if there’s no water flow.

9. Why is my flow switch not activating the pump?

• Insufficient flow/pressure: Ensure inlet pressure >0.2bar and flow >1.5L/min.
• Wrong model: Power rating < pump power or temperature model mismatch.
• Installation issues: Blocked sensor, reversed inlet/outlet, or wiring errors.
• Debris buildup: Clean the sensor to remove scale/sediment.

10. What’s the maximum temperature and pressure this switch can handle?

• Temperature: Normal (≤60℃ short-term, ≤40℃ long-term); high-temperature (≤100℃ short-term, ≤80℃ long-term).
• Pressure: ≤0.6Mpa (all models); no leaking under rated pressure.

11. Is this flow switch durable, and what’s the material?

Yes. It’s made of high-quality brass for corrosion resistance and long-term reliability. All units undergo strict leak and performance tests before shipping.

12. Can I use this switch for hot water recirculation systems?

Yes. Choose the high-temperature model (0–80℃ long-term) with a thermal insulation brass cap. It supports hot water pipes, solar heaters, and heating systems, withstanding up to 100℃ short-term temperatures.