Water flow sensor is a kind of can according to the hall element of hall effect measurement magnetic sensor quantities. When the positive series of the hall element to the load resistance, put it through to the 5 v dc voltage, and with the direction of the current direction of the field into orthogonal. The switch water flow through the turbine shell and drive with magnetic rotor spins, so, can form the poles different rotating magnetic field, then it will be cutting magnetic induction line, can form high and low pulse level at this moment. Magnetic rotor rotational speed with hall element related to the frequency of the output pulse signal is proportional to the relationship, and the rotation of the rotor speed and water flow is proportional to the relationship, if based on the size of the water flow to open the water heater burning gas, so it's the frequency of the pulse signal has the following formula: f = 8.1 q - 3. Formula, f is the frequency of the pulse signal; Q for water flow.

Then, can according to the water flow sensor output feedback signal, and then according to the controller to infer, the value of water flow. Using gas water heater selection model is not the same, you can choose the most appropriate starting flow, so that you can achieve low pressure started.

Below to introduce the working principle of water flow sensor.

Its main components are hall element, the flow rotor components, copper body and steady flow components. It is generally installed in the water heater inlet location, and then used to measure the rate of flow of water. At the time of water through the rotor components, magnetic rotor will start to turn, and rotational speed will change with the change of flow and linear. Then, hall element will accordingly output pulse signal that can be feedback to the controller, then can judge effectively by the controller of water flow changes size. Can be adjusted to control the current proportional valve size, and then according to the proportional valves to control the volume of gas, so that it can effectively prevent can appear in the process of using gas water heater in the summer of warm winter cold conditions.

Flow rotor of related components, turbine is the main part of the brake ring switch shell and magnetic rotor. Using water flow switch this way, the size of it shrinks obviously, and its performance is much better than mechanical differential pressure plate structure. When water flow through the turbine switch shell, can promote the magnetic rotor, let it spin. When different polarity to the hall element, hall element will conduction; When the magnetic left the hall element, hall element will disconnect. Then according to the above information can measure the rotor speed. And according to the actual measurement of rotor speed, flow and the curve of the output signal, can determine the start of the rotor speed and water pressure, water heater start to start the water pressure in the corresponding start of water flow. So, can be finished by controlling when the speed of the rotor speed than start hours, water heater to stop work; When the speed of the rotor is greater than start speed, water heater start work. Can therefore started setting water heater water pressure and water flow.

Also, because the water under the cutting of magnetic field of permanent magnet, will shift as magnetized water, this time, the oxygen content in the water will increase, so people will feel special and relaxed after the shower. And damping ring is to at the time of water supply, can stop the rotation of the rotor of high-speed rotating magnetic so you can stop the pulse signal output. So, when the pulse signal of the controller is not received, it will immediately the proportion of control to fuel gas valve closed valve, and then cut off the gas source, this can effectively prevent the phenomenon of dry. So, the rational use of water flow sensor, the security is guaranteed to the human body.