Safety system for machine

A safety system for a machine comprising:

• a pump;
• at least one hydraulic cylinder comprising a pressure chamber and a piston, the piston having a head and a rod, and being movable along a longitudinal direction of the at least one hydraulic cylinder, the hydraulic cylinder further comprising a first channel and a second channel extending into the pressure chamber;
• at least one lock finger connected to the hydraulic cylinder, the at least one lock finger being configured to engage a bracket of a tool, when the hydraulic cylinder and the piston, respectively, is in an extended position, which extended position corresponds to a locked state,
• a first pressure sensor and a second pressure sensor configured to measure pressure within the pressure chamber via the first channel and the second channel, respectively, the first channel having a first opening and the second channel having a second opening, which first and second openings extend into the pressure chamber, said first opening and said second opening being spaced apart from one another as seen in the longitudinal direction of the at least one hydraulic cylinder;
• a seal arranged circumferentially around the head of the piston;
• and
• a hydraulic system being fluidically connected to a head side and a rod side of the at least one hydraulic cylinder, the hydraulic system being fluidically connected to a hydraulic fluid reservoir and the pump,
• wherein the seal is designed to move a plurality of times over the first and second openings and wherein the first pressure sensor senses a pressure P1 and the second pressure sensor senses a pressure P2, and wherein the piston in said locked state is detected when:
• P1<P2.