What is the MTTF value for Tesys products ?

Regularly customer request MTBF ( Mean Time Between Failure ) or MTTF ( Mean
Time To failure ) data to calculate performance level or SIL level of theirs
equipments.
Both data are statistical data calculated using different parameter based on our field
experience ( Product returned versus Product manufactured.)
MTBF concern repairable components only.
Our TeSys products are not repairable, so we can only provide to our customer
MTTF data.
You will find bellow MTTF data for our main product range and in attachment a short
presentation on how we do calculation