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Contact-type measuring sensors -v-optical measurement sensors

31 May 2016

Contact-type sensors, also referred to as tactile or contact sensors, are suited to use in tough industrial environments where the surfaces to be measured are likely to be contaminated by oil, coolants, grease, fat, water or dust, which can make accurate measurements difficult for optical sensors.

However, what may be problematic with contact-type measuring sensors is the mechanical lateral load and its effects on the measurement accuracy. With its new HG-S measurement sensor Panasonic says it has addressed this problem.

The addition of high precision bearing are said to have enhanced measurement stability. The design of the HG-S Series has resulted in a very low coefficient of thermal expansion, which means that the resolution will not be affected over the whole operating temperature range. In addition, conventional contact-type sensors have a typical lifetime of around 1 million lateral loads, whereas, according to the company, the HG-S series has a lifetime of 100 million lateral loads.

Applications in industrial plants tend to focus on productivity and this is why absolute position detection is often the preferred choice, allowing for reliable measurements to be made without the need for a mechanical zero.

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