|Inductive sensors are nowadays indispensable for industrial usage. As compared to mechanical switches they offer almost ideal conditions: non-contact operation free from any wear and tear, high switching frequencies and accuracy. In addition, they are insensitive to vibration, dust and moisture. Inductive sensors detect all metals without contact.|
|Capacitive sensors are used for the non-contact detection of any objects. In contrast to inductive sensors, which only detect metallic objects, capacitive sensors can also detect non-metallic materials.
Typical applications are in the wood, paper, glass, plastic, food and chemical industries.|
|Magnetic sensors are used for the detection of positions without contact or wear and tear in control technology. They are used where inductive proximity switches reach their limits. Since magnetic fields penetrate all non-magnetisable materials, the sensors can detect magnets through walls made of non-ferrous metal, stainless steel, aluminium, plastic or wood.|
|Non-contact sensors virtually work without wear and often achieve a longer life than Reed switches. This saves expensive repair and downtimes.|
|Ultrasonic sensors are used for reliable position detection and precise continuous distance measurement of solids, powders and liquids. They transmit and receive sound waves in the ultrasonic range. The object to be detected reflects the sound waves and the distance information is determined via time of flight measurement. The non-contact detection is independent of colour, transparency, surface characteristics or surface shine of the object. Blister packages in packaging technology or transparent plastic bowls in the food industry, for example, can be reliably detected.
Even in operating conditions with heavy soiling, dust or mist the sensors detect objects reliably and without interference.|
Photoelectric sensors for general applications
|Photoelectric sensors are used where safe and non-contact de-tection of the exact position of objects is required. The material of the objects to be detected is of no importance. Compared to proximity switches photoelectric sensors have a much higher sensing zone.|
Photoelectric fork sensors / angle sensors
|As is the case with through-beam sensors transmitter and receiver are arranged face to face. Both components are permanent parts of a fork or an angle, i.e. they do not have to be aligned towards each other.|
If an object enters the detection zone, the light beam is interrupted and a switching signal is generated. Optical fork and angle sensors use a particularly fine light beam and are thus suitable for the detection of tiny objects.
Laser sensors / distance measurement sensors
|Laser systems are used where detection of small objects or precise positioning is required.|
Due to the small angle of divergence long ranges of up to 60 metres can be achieved.
Fibre optic sensors
|Fibre optics are used where mounting space for photoelectric standard sensors is confined. Advantages of these systems: The evaluation electronics and the optoelectronic components are located separately from the sensing surface of the system.|
Fibre optic sensing heads can therefore be mounted in places where access is difficult.
Photoelectric sensors for specific applications
|Special tasks require special solutions. In addition to the standard photoelectric sensors and fibre optic systems ifm electronic offers special sensors for certain applications.|
Feedback systems for valves and valve actuators
|ifm electronic offers two inductive sensors integrated into one housing for position feedback on quarter-turn actuators (type IND). A target puck with two targets offset by 90° which is installed on the actuator shaft damps the lower or upper sensor of the IND depending on the position of the actuator ("open" or "closed).
For position feedback on rising stem valves efector valvis is used. Two or three optional switch points can be set via a pushbutton over a stroke of 80 mm. This measuring stroke is resolved into steps of 0.2 mm by means of a target mounted on the valve spindle. Using this inductive sensor enables the detection of even very short strokes.|
|Switching amplifiers evaluate the sensor's signal and control the output. Variants with relay as well as active transistor and potential-free optocoupler outputs are available.|