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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- Spring '12
- pH, proximity sensors, Festo Didactic GmbH, Festo Didactic GmbH & Co