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    Thermal Dispersion Air Flow Switch, 24VDC/ 220VAC

    $168.95
    SKU: ATO-RMD-F5
    Economical price thermal dispersion air flow switch for sale, various lengths of sensors can be selected: 15mm, 20mm, 30mm, 40mm, 60mm. G1/2, G1/4 male thread/ M18 female thread, PNP/ NPN/ relay output signal, 6 LED lights to indicate the velocity.

    Thermal Dispersion Flow Switch, G1/2 or G1/4 Thread

    $152.62
    SKU: ATO-RMD-FE1
    Buy best thermal flow switch with the measuring range of water 3-300cm/s, gas 200-3000cm/s, oil 3-300cm/s. Liquid, air, oil can be measured, accurate to ±1-±10cm/s. G1/2, G1/4 male thread or G1 thread, 100 bar working pressure, 15-60mm sensor length, PNP/ NPN/ relay/ 4-20mA output signal.

    Thermal Dispersion Gas Flow Switch, PNP/ NPN

    $153.38
    SKU: ATO-RMD-FAB
    Buy thermal dispersion gas flow switch from ATO to get the best price and highest quality. It has the advantages of LED display, PNP/ NPN/ relay output signal, 24VDC/ 110VAC/ 220VAC power supply. IP67 protection grade, free maintenance.

    Thermal Dispersion Liquid Flow Switch, M18/ G1 Thread

    $251.08
    SKU: ATO-RMD-F2
    Buy new design thermal dispersion liquid flow switch from ATO. Gas & liquid dual use flow switch, the flow percentage will be displayed on the digital display screen. It has wide power supply: 18-24VDC, 85-265VAC and multiple sensor length options: 15mm, 20mm, 30mm, 40mm, 60mm.

    Thermal Dispersion Water Flow Switch, Relay/ 4-20mA

    $170.51
    SKU: ATO-RMD-F1
    ATO thermal dispersion water flow switch has 6 LED lights to indicate the flow rate, which is very intuitive. The 4 optional output signals are PNP/ NPN/ Relay/ 4-20mA. The length of the sensor can be selected from 15mm, 20mm, 30mm, 40mm, 60mm, or can be customized as required.

    G1/4" Magnetic Water Flow Switch

    $48.29
    SKU: ATO-MR-2253
    Magnetic water flow switch for sale at low price, G1/4 thread, 50W, flow rate 15, 30, 50 L/min available. This water flow sensor consists of magnetic core, external case and reed switch, which is used in different water systems.

    G1/2" Magnetic Water Flow Switch

    $57.79
    SKU: ATO-MR-2260
    Water flow switch is a flow sensor which consists of magnetic core, external case and reed switch, G1/2 thread, 50W, optional flow rate 15, 30, 50 L/min, reliable components of the reed switch with low price.

    G3/4" Magnetic Water Flow Switch

    $77.39
    SKU: ATO-MR-4060
    G3/4 thread magnetic water flow switch is a flow sensor used in the control of water charging and discharging, water circulation and other water systems. It consists of magnetic core, external case and reed switch, reliable and low price.

    3/8" Digital Flow Switch for Air

    $234.99
    SKU: ATO-FLOW-38
    High sensitive digital flow switch for air with 3/8 inch thread port size, measuring air and Nitrogen (N2), operating fluid temperature range from 0 to 50℃, selectable PNP or NPN signal output. This air flow switch comes with sensor for flow sensing to transmit data to the mainboard.

    1/2" Digital Flow Switch for Air

    $231.79
    SKU: ATO-FLOW-12
    Factory price digital air flow switch for sale, 1/2 inch thread port size, with digital display for real time monitoring, ±2% accuracy, measuring air and Nitrogen (N2), fluid temperature 0~50℃. This air flow switch comes with high sensitive sensor, which is designed for flow sensing to transmit data to the mainboard.

    3/8" Digital Flow Switch for Water

    $306.39
    SKU: ATO-FLOW-W38
    Digital water flow switch for sale at favorable price, 3/4 inch thread port size, with digital display for real time monitoring, ±2% accuracy, measuring water and ethylene glycol aqueous solution, fluid temperature 0~90℃. This water flow switch comes with water sensor, which is designed for flow sensing to transmit data to the mainboard, Selectable signal output PNP or NPN.

    1/2" Digital Flow Switch for Water

    $307.99
    SKU: ATO-FLOW-W12
    Factory price digital water flow switch for sale, 1/2 inch thread port size, with digital display for real time monitoring, ±2% accuracy, measuring water and ethylene glycol aqueous solution, fluid temperature 0~90℃. This water flow switch comes with water sensor, which is designed for flow sensing to transmit data to the mainboard.

    3/4" Digital Flow Switch for Water

    $395.59
    SKU: ATO-FLOW-W34
    Favorable price digital water flow switch for sale, 3/4 inch thread port size, with digital display for real time monitoring, ±2% accuracy, measuring water and ethylene glycol aqueous solution, fluid temperature 0~90℃. This water flow switch comes with water sensor, which is designed for flow sensing to transmit data to the mainboard, Selectable signal output PNP or NPN.

    1" Digital Flow Switch for Water

    $446.39
    SKU: ATO-FLOW-W1
    Compact digital water flow switch for sale at low price, 1 inch port size, with digital display for real time monitoring, ±2% accuracy, fluid temperature 0~90℃. This water flow switch comes with water sensor, which is designed for flow sensing to transmit data to the mainboard.

    The flow switch is mainly installed online or plug-in in the water, gas, oil and other media pipelines. When the flow is higher or lower than a certain value, the switch will be triggered to output an alarm signal, and the system can take the corresponding action after obtaining the signal. Common flow switches mainly include piston flow switches, thermal dispersion flow switches, electronic flow switches, etc. Compared with traditional vane type flow switches and piston flow switches, the air/ water/ oil flow switches have higher sensitivity. Because the installation position of the thermal dispersion flow switch is not restricted, there is no wear of the movable mechanical structure, and the liquid containing impurities can be measured. And when you buy a thermal dispersion flow switch from ATO, you can choose different materials to measure the environment of different acid and alkaline liquids. They are all suitable for hydroelectric power generation, refrigeration and air conditioning, electronics, chemistry, shipbuilding, food, pharmaceuticals, optics, semiconductors and other industries. In addition, ATO.com also provides 1/4 inch, 1/2 inch, 3/4 inch 3/8 inch and 1 inch water and air flow switches for your applications.

    Water Flow Switch Working principle

    When there is water flowing in the water flow switch, and the water flow rate is greater than or equal to 1.0 liters per minute, the magnetic core in the water flow switch is displaced by the water flow, and the displacement of the magnetic core drives the magnetic source to produce a magnetic control effect, so that the water flow switch outputs "on" signal. The signal is input to the equipment control system, and the control system realizes the control function. When the water flow is less than the starting flow, the water flow switch outputs an "off" signal. The control system produces the opposite control action to the above. When the water flow in the pipeline is less than 1 liter per minute, the magnetic core drives the magnetic source to return under the thrust of the return spring, so that the sensor outputs a "0" switch signal and stops the system.

    Thermal Dispersion Flow Switch Working Principle

    Thermal dispersion flow switches are designed according to the principle of heat exchange. During the measurement, heat is generated by the heating module. If there is no medium flowing in the pipe, the heat received by the thermal sensing module is a fixed value. When there is a medium flowing, the heat received by the thermal sensor module will change with the change of the medium flow rate. The thermal sensor module converts the temperature difference signal into an electrical signal, and then converts it into a corresponding standard analog signal or contact through the processor signal is output. The thermal dispersion flow switch displays and controls the flow of the medium through this signal. Thermal air water flow switch consists of two temperature sensors, power supply, signal processor and output relay or NPN/PNP transistor output. The voltage drop of these sensors is proportional to temperature and operates accurately over a wide temperature range. Heat one of the sensors above the medium temperature. The other sensor has the same temperature as the medium. Equal constant current flows through the two sensors to produce a voltage difference that is inversely proportional to the amount of heat absorbed by the medium on the first sensor. Since the flow rate of the medium is proportional to the heat taken away, by measuring the voltage difference between the two sensors, the flow rate of the medium at this time can be known, and the flow rate of the medium can be known by calculation.

    Flow Switch Function Testing

    The water flowing through the plastic valve core enables the onboard permanent magnet to approach the transducer on the external black switch for the purpose of sending signals. When there is no water flow or there is obstruction that stops water flowing through the switch, the two magnets located inside the flow switch will produce a repulsive force which serves to reset the switch. To put it simply, whether there is a signal output from the flow switch depends on whether there is water flow through the switch, and this is the working mechanism of the NO switch.

    The magnetic water flow switch from ATO features G1/2" of joint size at both ends. Here we prepare two pagoda joints for the ease of joining up the water pipe and the switch. With the water pipe part done, we can join together the magnetic water flow switch and other necessary components according to the control circuit diagram. The on-off of the relay is controlled by the magnetic water flow switch. The warning light is controlled by the normally closed contacts of the relay.

    If you want to know more about flow switch, please click this video.

    Flow Switch Application

    Flow switches are used to monitor and control the flow of fluids in industrial process systems. Automated industrial systems that handle fluid media rely heavily on flow switches to ensure safe and optimal flow. Flow switches respond to pre-set flow levels, and when those levels are reached, the flow switch has two functions, including closing the contacts, causing a particular device to open, or opening the contacts, causing a particular device to close.

    What are the Types of Flow Switches?

    • Gas flow switch: It is suitable for media such as air and steam. They are commonly used in HVAC applications.
    • Liquid Flow Switches: For use with media including water, lubricants, chemicals and slurries. They are widely used in various industrial applications.
    • Volumetric Flow Switch: It is used to measure the flow of liquids or gases. This measurement is based on volume per unit of time.
    • Velocity flow switch: It is used to measure the flow of moving media. This measurement is made with velocity.