1° -  Introduction of the cans in the can tester

2° - Creation of the right step between the cans  and their insertion in the pockets of the rotating table

3° - The cans are moved as far as they touch  the rubber heads mounted on the testing heads which realize an hermetic closure  resting on the edge of the cans that have to be tested

4° - a vacuum (or a pressure) is created inside the can and immediately the pneumatic circuit is closed by a special valve

5° - a transducer realizes a first reading of the vacuum (pressure) value inside the can and this value is immediately memorized by the PLC 

6° - after an half turn of the rotating table, the testing head reaches the second transducer that realizes another reading of the vacuum (pressure) value remained inside the can and also this value is memorized by the PLC

7°  -  THE PLC CALCULATES THE DIFFERENCE BETWEEN THE TWO READINGS and compares this value with a threshold previously set : if the difference is bigger than the allowed limit,  then the can is considered faulty and so it will be ejected.

8° - the valve opens again the pneumatic circuit,  the cans come off from the rubber heads of the testing heads end exit on the conveyor.