How Does A Touchless Faucet Work: Ultimate Guide

Do you like the idea of touchless faucets but don’t understand how they work? Many people are curious about how the technology behind these faucets works, and this blog post will answer that question! Touchless faucets have become increasingly popular in recent years, and for good reason. They are more hygienic and efficient than traditional faucets.

In this post, we will discuss how the sensors in touchless faucets detect when your hands are near and activate the water flow. We will also talk about some of the benefits of using a touchless faucet in your home or office.

What Is a Touchless Faucet?

A touchless faucet is a type of faucet that is activated by sensors rather than by touch. When your hands are near the faucet, the sensors detect the movement and activate the water flow. This technology has become increasingly popular in recent years, as people have become more interested in how it works and the benefits that come with using it.

Four Parts of a Touchless Faucet


Touchless faucet has a sensor at the tip of the faucet spouts. The work of the sensor is to detect the presence of the hands. The presence of the hands turns on the water flow, and that why it is commonly known as presence sensor. Presence sensor in touchless faucet have a tiny infrared light.

As the most important part, the work of the sensor is to forward the signals to the valve to turn on the faucet after detecting your hand. Its job is to inform the valve when to start or stop the flow based on the presence or absence of your hands.

Touchless faucet also features ultrasonic sensors which happens to be a common mechanism. Ultrasonic sensors make the valve to open up and release water when the hands enter the field of operation and interrupts the sensor. The water flow stops the moment you remove your hands.


The positive or negative signals from the sensor control the solenoid valve. According to Hunker, “the solenoid is an electromagnet that can push or pull, depending on electric polarity”. The polarity of the signal determines if the solenoid will either engage a pull or push actions.

The valves control the water flow by using a rubber-like disc. When there is no signal, the valve is closed, meaning no water flow through the faucet. The presence of a hand will send a positive signal to the solenoid causing it to pull the valve open for water to flow. The solenoid will close up the valve by a push action when the hand is no more.


The spout contains all the other working parts since it is the central element of the touchless faucet. You’ll find spouts of different styles. They often match with your kitchen fixtures and lifestyle. Faucet spouts are some of the things that will make your visitors wish to spend more time in your kitchen. Thus, you should pay more attention to the finish and shape of the spout as well.


There are a few ways in which a touchless faucet gets its power. Depending on the mode, a low-voltage current from an AC transformer can provide power to allow the water to flow, or power may come from a dry-cell battery inserted in the back or neck of the fixture.

Electricity is needed to power the sensor, control electronics and operate the water valve. A battery-powered faucet uses a latching solenoid valve. This stays in the open position until a flow of power pushes them back to the shut position.

How Does A Touchless Faucet Work?

When the presence sensor detects anything below it, the sensor will give a signal to the solenoid valve to let the water flow out. But, as soon as the presence sensor detects the absence of that object, it will instruct the solenoid valve to discontinue the water flow after a fixed quantity of time.

On the other hand, some advanced faucet models have an ultrasonic field sensor that orders the valve to start water flow when your hands interrupt the ultrasonic field.

Usually, a solenoid-actuated diaphragm valve is used to start and stop the flow of water.

  • The spout holds optical fiber cables that attach it to the presence sensor. Then, the presence sensor conveys its signals through this fiber optics. The spout may also include batteries in some models.
  • The waterproof connector as a bridge connects the sensor, battery and solenoid valves.

Simply, when the presence sensor or light sensor detects an object, it permits the solenoid which pulls the valve to begin the water flow. If it does not detect the same thing or anything in front of it, it orders the solenoid that will stop the water flow after a period of time (around 30 seconds) by pushing the valve.

Benefits of Touchless Faucets

Touchless faucets, available in kitchen and bathroom versions, enable you to wash your hands without having to come into contact with faucet handles. This cuts down on germ transmission, as you don’t touch the faucet while your hands are dirty and you don’t have to touch a dirty faucet with clean hands. The faucets are also convenient if your hands are full, for example if you need to wash a handful of fruit or vegetables.

Troubleshooting a Touchless Faucet

If your touchless faucet is not working, you may need to troubleshoot it. The most common problems are that the sensor is not detecting hands or water flow is intermittent.

  • If your touchless faucet doesn’t seem to be sensing hands, try washing your hands under the faucet in a different way. For example, if you usually cup your hands to get water flowing, try using your palms instead.
  • If the faucet doesn’t seem to be responding intermittently, check to make sure that there is no food or debris caught in the sensor. You can also try cleaning the sensor with a cotton swab and warm soapy water.
  • If the battery power seems to be low, check how many batteries you have in your faucet. Some models require more than one battery, but if only one is present it may not provide enough power for consistent functioning of the sensor. Replace any dead batteries and make sure that extra batteries are available so you can replace them when needed.
  • If water flow is intermittent, check to see if the solenoid valve needs to be replaced. You can also try cleaning the valve with a cotton swab and warm soapy water.

Maintenance Tips

The cleaning of touchless faucets should be like ordinary faucets. But you should be careful with the electrical components.

  • Try your best to avoid the use of harsh chemicals on the surface of the faucet. Also, keep chemicals far away from the battery pack.
  • Be careful to replace the battery with the right size. The rating and functionality must same as the original.
  • And finally, don’t discard the battery in fire.


Now that you know the answer to how does a touchless faucet work, you should also be aware that it is the most useful fixture in the kitchen. Also, the faucets need maintenance and cleaning like any other appliances.

It is beat to Avoid harsh chemicals on the surface of the device and the battery pack. Take caution when cleaning the electrical components, make sure you concentrate and take care.

Understanding the touchless faucet inside and out will lead to better experience while using it. Your kitchen environment will also have a positive impression

Kitchen are important areas in all households; therefore, it is beat to equip it with nothing but the best. and in doubt a touchless faucet falls in that category.

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