Inductive sensors
Inductive sensors are non-contact sensors designed to detect (conductive) metal objects. They use a magnetic field that is generated at the front of the sensor. A metal object dampens this magnetic field and reduces the amplitude of the internal resonant circuit. Once the switching threshold is reached, the sensor emits a switching signal Read more here
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Mode of operation of inductive sensors
How do inductive sensors work?

The functional principle


1. Sensor not flush mounted, 2. Flush mountable sensor
a. Metal
Observance of free zones

D: Diameter of the active surface (see data sheet)
1. Sensor not flush mounted, 2. Flush mountable sensor
The sensing range of inductive sensors
The distance at which inductive sensors switch is referred to as the sensing range. Depending on the approaching metal, a correction factor must be applied for the majority of inductive sensors to reduce the sensing range. The following table displays the factors of various metals for the majority of inductive sensors:
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Inductive sensors are a type of position sensor. These sensors come into play where it is necessary to register the position of a metallic object within a range of a few millimetres to several centimetres. The actual registration range depends on the sensor model. In almost all automated processes, sensors are essential to provide the control unit with information. Inductive proximity sensors from autosen provide the necessary signals on positions and end positions and serve as a pulse generator for counting tasks or rotational speed registration. The inductive sensors are used in very varied applications with differing requirements regarding the range and protection rating.
Our inductive sensor classes
Standard Class
High Resistance Class
Full-metal housing
Factor-1 sensors
IO-Link
Miniature
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Inductive or capacitive sensors
Advantages and disadvantages of inductive sensors
- high switching frequencies
- a specially high degree of switch point accuracy
- and wear-free, contactless operation for registering all kinds of metal
- they can withstand dust, moisture and vibrations
- function without contact and wear-free and
- still work properly even if the sensing face gets covered with material


All the advantages of inductive sensors at a glance:
- Reliable position detection for metallic objects and short measurement ranges
- Contactless and wear-free operation
- Exact measurement whether the object is moving or not
- Insensitive to deposition on the sensing face
- Insensitive to dust, moisture and vibrations
- Broad operating temperature range
- High protection ratings
- High switching frequencies and high switch point accuracy
- Higher sensing ranges
- Short-circuit proof and proof against reverse polarity
Application examples for inductive sensors
In view of the many different types, inductive sensors can be used in a very wide range of applications and sectors. Their high protection ratings and robustness make them suitable for use in the foodstuffs industry, beverages industry and robotics.
Here are some examples:
- Detection of moving machine components and objects that are to be processed
- Counting metallic components in component feeding and conveying technology
- Highly precise referencing of zero positions for moving parts (robotics)
- Position monitoring
- Stable drives
- Machine tools
- Hydraulic aggregates
- and much more