fibres can withstand hostile environments, such as high vibration, extreme heat, wet, corrosive, explosive and electrically noisy environments. With these, however, you have to buy a fibre and a sensor, and they have relatively short range.
Radar sensors use a frequency modulated continuous wave in the GHz frequency band to detect both stationary and moving targets, and their field of view can typically vary from 10˚ to 90˚. Ranges from 3.5m to 100m are available. The target must contain metal, water or a similar high-dielectric material. Particularly suited to detecting stationary or
moving vehicles in rain, snow, high and low temperatures, and wind, these can also be used to detect a poor target in front of a good reference target. Radar sensors can be hidden behind a plastic facia panel or in a plastic box with negligible effect in performance.
Radar sensors
This type of sensor (pictured right) is used in liquid level measurement. With this, an electromagnetic wave is emitted along the probe, and when the wave reaches the medium it is partially reflected due to the different level of permittivity in comparison to the surrounding air. The electromagnetic wave is recaptured by the sensor and the distance to the surface of the liquid can be calculated from the elapsed time. Foams on liquids can be reliably filtered out to give a true liquid level measurement. If the sensor is used in a metal container, its
interior wall functions as an outer conductor for the electromagnetic wave. In non-metallic containers, a coaxial tube is used to replace the outer conductor. Guided microwave sensors are generally
used in applications such as: monitoring coolants and lubricants in machine tools; monitoring cleaning solutions and cleaning agents in mechanical engineering; filling systems in automotive production chains; level measurement in industrial processes subject to difficult environmental conditions, etc.
I/O Link has many benefits, such as automatic reprogramming of replacement sensors and data collection. It also brings a whole new level of options to measurement sensors. Typically,
According to
measurement sensors used to fall into one of three categories: 1) Measurement with discrete switching points; 2) Measurement with analogue (0-10v or 0, 4-20mA) outputs; 3) Measurement with data output. These often incorporate categories
1 and 2 with data I/O. One sensor can now perform multiple tasks, discrete outputs for position limits or alarms, analogue
outputs for indication, and data output for highest resolution control or analysis. Furthermore, I/O Link enables
on-the-fly programming of set points, analogue windows, etc. giving
greater flexibility in changing applications. I/O Link also enables condition based monitoring, facilitating local logic based control and OEE (Overall Equipment Effectiveness). Having been at the
forefront of sensor technology for over 50 years, Turck and Banner have the right sensor for the application – no matter what kind of object or material has to be detected or inspected, or what requirement has to be met.
I/O link sensors
The compact sensor enables particularly simple and
the company, the compact sensor enables particularly simple and fast commissioning and parameterisation thanks to the IO-Link interface. This means that data is available more quickly and in a standardised form for use, for example, in an ERP system. This ultimately leads to cost savings and increased efficiency. With the help of the IO-Link technology, data is transmitted interference-
fast commissioning and parameterisation thanks to the IO-Link interface
free. The data transmission is based on a 24V signal, which is completely digital; and the signal transmission is very safe against external influences. Inaccuracies in measurements are thus a thing of the past. Of additional benefit, with the IO-Link technology, a wide variety of
values can be measured. This gives the user more flexibility and the possibility of simple integration into existing systems. Condition monitoring applications can therefore be easily designed. Remote diagnostics are also possible via the IO-Link sensor.
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