Deutsch | English | Login

String inspection

String testers by pi4 use extremely high camera resolutions. They detect and measure the smallest flaws in cells as well as errors and deviations in the positioning of bus bars. The device is perfect for integration into a production line. An easy-to-operate user interface allows for optimum adaptation to the customer-specific quality requirements. Tolerances of all error detection criteria can be set and optimised by the operator. The short evaluation time of the system provides for short cycle times in the production.


  • measuring of string length, cell dimensions, and distances between cells
  • checking if cells lie with the correct side up
  • checking the positions of bus bars on every cell and at the ends of a string
  • detection of cracks, holes and broken parts
  • EL check