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Contact-type measuring sensors vs optical measurement sensors

01 June 2016

Panasonic looks at the difference between contact-type measuring sensors and optical measurement sensors.

Contact-type sensors, also referred to as tactile or contact sensors, are ideal for tough industrial environments where the surfaces to be measured are likely to be contaminated by oil, coolants, grease, fat, water or dust. Optical sensors are unable to measure such surfaces accurately whilst contact-type measuring sensors can. However, what may be problematic with contact-type measuring sensors are the mechanical lateral load and its effects on the measurement accuracy. With its new HG-S measurement sensor Panasonic addresses this problem.

Enhanced mechanical stability

Measurement stability has been enhanced thanks to high precision bearings. The design of the HG-S Series means they have a very low coefficient of thermal expansion, which means the resolution will not be affected over the whole operating temperature range. In addition conventional contact-type sensors have a typical lifetime of approx. 1 million lateral loads, whereas the HG-S series has a lifetime of 100 million lateral loads, which is one hundred times as long. 

Thanks to the CMOS technology, measurements are performed with a resolution of 0.1µm and a measurement accuracy of 1µm.

Absolute position detection

Applications in industrial plants tend to focus on productivity and this is why absolute position detection is preferred over incremental position detection. Absolute position detection allows reliable measurements to be made without the need for a mechanical zero.

Separated amplifier

The DIN-rail mountable amplifier has a fast response time of only 3ms and includes a 2-line digital display with the integrated graphical indicator which is easy to read. One master unit can be connected up to 15 slave units which results in less wiring and the ability to copy settings to other units and to collect measurement results. 

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