How sensor taps works

Apr 28, 2021 9:13 | Feature & Viewpoint

sensor taps combine four key components: Solenoid valve, infrared sensor, power source, and a tap unit/shell.



When the sensor senses the presence of an object (i.e. user’s hands) in front of the tap and sends a signal to the solenoid valve to initiate the flow of water. When the object is no longer present, the infrared unit sends an electronic signal to the solenoid valve again to terminate the flow of water usually after a few seconds.



Solenoid valve : Transforming electrical energy into motion, the solenoid physically starts and stops the water flow. Autotaps products use “latching” solenoid valves. The solenoid valve is initially energized to start the water flow; the plunger is driven into the range of a permanent magnet which in turn holds the plunger in the “open” position. In order to return the plunger into its original “closed” position the solenoid is once again “pulsed” but this time by reversing polarity.



Power source : Most of our Autotaps models have the possibility to be powered by regular AA batteries (Alkaline) or by mains via a 6V transformer. Batteries and transformers are included with most of our products.