Question

A requirement to sense glass bottles leaving an automatic washer on a production line conveyor belt has been notified to you. The output from the sensor is to be of binary form, i.e. logical 1 when the part is present and logical 0 when no part is present. It is also necessary to ensure that a change of sensor state occurs closer to the sensor when a bottle approaches than when it moves away. The switching distance will lie between 5 and 20 mm. The production line is for food products and the environment is clean and maintained at a temperature of 15°C. Bottles will pass the sensor at the rate of 10 every second. There is no requirement for protection from contact with objects but it must be proof against water drips.

(a) Recommend a suitable sensor and justify your recommendation. Sketch a diagram that shows the functional blocks within the sensor and explain each function.

(b) Would the recommended sensor be suitable if a change was made from glass to plastic bottles?

Answer 1

i strongly recommend limit switch is the best sensor in plastic bottle applications