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 The use of inductive sensors as sources of information is essential for control functions in all automatic oprations. The sensors supply the necessary signals on the position, limits, levels or serve as pulse generators. In industrial applications two systems in particular have proven themselves, namely inductive and capacitive proximity sensors for non-contact detection of the most varied materials.
Inductive sensors use the physical effect of the change in quality of a sympathetic oscillation circuit, which is caused by eddy-current losses in electroconductive material. An LC oscillating circuit generates a high frequency alternating field. This field is emitted at sensing face on the sensor. When an electroconductive material enters this field, eddy currents arise in accordance with the Faraday's law which withdraw enrgy from the oscillation circuit - the oscillation amplitude is redused.
The two states namely:
a) no object in front of the sensing face (i.e. high oscillation amplitude) and b) object in front of the sensing face (i.e. low oscillation amplitude) are converted into a switching signal.
From this functional theory follows that all electroconductive materials are detected - irrespective of wheter they move or not.
The high-frequency field causes neither a detectable increase in temperature nor magnetic influences in the object. The inductive proximity sensors function non-interacting. In comparsion to mechanical switches the sensors are almost ideal for industrial applications: noncontacting, non-wearing operation, high switching frequencies and repeat accuracy as well as a high degree of protection against vibration, dust and humidity.
The distance to the sensing face at wich an electroconductive material in the inductive proximity sensor causes a signal change is called the sensing distance. The sensing distance of an inductive proximity sensor is determined by means of standard target made of St 37 steel. The sensing distance is subjet to certain corrective factors when the switch has been subject to vapouring with other metals, e.g. aluminium, copper, etc.
In industrial applications the inductive sensors are often subjects to extreme strains caused by the enviromentel conditions. The operational reliability of the sensors thus depend to a great extent on the corresponding protective measures, which are guaranteed by SKS through modern construction and manufacturing methods as well as constant quality control.
Careful design of the mechanical parts on CAD systems, dimensionally true housings and components, special casting compounds and processes as well as the reliable sealing of housings, terminal compartments and potentiometers guarantee a high degree of protection and mechanical robustness.
Inductive Sensor Models Downloads:
Inductive ACDC Sensors
Inductive Analog Sensors
Inductive Namur Sensors
Inductive Square DC and Microsquare Sensors
Inductive Ring Sensors
Inductive Switch Distance XXL Sensors
Inductive Ultra Mini Sensors
Inductive Cylinder DC Sensors
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