The operating distance of an Inductive proximity switch is the distance between an object and the active sensor surface at which a switching signal is generated. The operating distance depends on the diameter of the coil. Therefore larger sensors are required for longer operating distances. On some sensors the operating distance is adjustable. If a metal object dampens only a part of the alternating field, the operating distance decreases; a larger object increases it. The following approximate values are derived from a standard rectangular measurement plate made of steel ST 37 with an edge length that corresponds to the diameter of the sensor coil or three times the rated operating distance, whichever is greater.For more information on the range of inductive proximity sensors we have available please call us on +44 1827 310666 or email sales@PowTechnology.co.uk