However a tolerance range must be taken into

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Unformatted text preview: mbH & Co. KG • FP 1110 6. Optical proximity sensors Adjustable sensitivity The effect of the diffuse sensor depends on the difference in reflection of the object and the background. With only a slight contrast, the response threshold can, if necessary, be selected via the sensitivity setting on the proximity sensor (1-turn potentiometer or multiturn potentiometer) in a way that the object is reliably detected even under these difficult conditions. However, a tolerance range must be taken into consideration in respect of ageing, voltage and temperature fluctuations and dirt. For this reason, the setting range must not be taken up completely when making the adjustment. When carefully setting the diffuse sensor with the potentiometer, a certain margin must be made to take into account changes in the condition of the object such as contamination of the proximity sensor, dust in the atmosphere etc. Close, barely functional adjustments can lead to problems. Some diffuse sensor haves a built-in flashing...
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