The limit switches, or magnetic sensors, must be mounted on cylinders with magnetic piston.
These, when hit by the magnetic field generated by the piston as it approaches, close the circuit sending an electrical signal to relay, solenoid valve or converse with the controlling electronic system of the machine. There are both ampulla Reed and Hall effect magnetic sensor available. The sensors are attached to the cylinder by a proper clamp, slot or adapter and may have an activation LED indicator.
Note: The magnetic sensors are according to the Directive EMC 89/336/CEE and following amendments.