Electro optic systems and liquid level sensors
Traditional liquid level sensors based on pressure (diaphragm), mechanical or magnetic floating devices have moving parts in them. These moving parts make them less rugged, dependable and reduce their useful life.
These systems are simple, solid state devices with no moving parts and are economical, compact in size and lightweight.
The electro optic systems based on infrared technology have an infrared emitter and an optical receiver.
When only air is present in the object to be sensed, all the light emitted is reflected internally by the dome of the probe and returned to the receiver. When there is liquid, a large amount of rays emitted is absorbed / refracted by the liquid.
IR sensors can be mounted in any angle and top, side or bottom fitted.
They can have different output types.
The IR sensors are not affected by the liquid hardness or conductivity and hence can be used in any geographical area without any alteration.
They can sense the levels of clear, translucent, reflective, as well as opaque liquids.