Naturally a float placed in a liquid tends to stay at the surface, this is the effect that is exploited here by detecting the displacement of a float when the liquid surface reaches its height in the tank. Rotary paddle level switch: a motor rotates a paddle, when the product reaches the paddle, the rotation is stopped and the detector switches.Įlectro-optical level switch: the light coming from an infrared LED is reflected towards a receiver by a prism, when the level of liquid reaches the prism the beam is not reflected anymore but refracted in the liquid, which causes the detector to switch.įloat level switches are based on a simple principle: the combination of a float and a mechanical or magnetic switching device (reed switches). Vibrating level switch: a rod or blades vibrate at their resonance frequency, when the product reaches them, the vibrations are damped and the detector switches. The main technologies used for level switches are:įloat level switch: a float follows the movement of the surface of a liquid and triggers a switch.Ĭapacitive level switch: the detector forms an electrical capacitor with the tank, whose capacity changes when the level reaches the detector.Ĭonductive level switch: when a conductive liquid comes into contact with the electrodes of the switch, current is able to flow and trigger the switch. The different types of technology available are more or less suitable according to the type of product you want to measure the level for, whether it is a liquid, a pasty product or a solid in bulk. There are several types of technology used for level switches, and some of them are also used for level sensors.
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