During PSS training, the following absolute depth limits may not be exceeded:
– Diving with air or nitrox max 50 metres (165 feet)
– Trimix dives max 100 meters (330 feet).
Partial pressure of oxygen – At all times during the dive, the partial pressure of oxygen in the breathing mixture must be between 0.14 and 1.6 bar. The maximum programmed partial pressure of oxygen for the purpose of calculating the optimum bottom mix shall not exceed 1.4 bar.
Partial pressure of nitrogen – At no time during the dive may the partial pressure of nitrogen exceed 4.75 bar. The recommended partial pressure of nitrogen as an upper limit is 4.0 bar.
Decompression time – In technical diving, the limits of the safety curve are usually exceeded and mandatory decompression stops must be performed. In this case, limits have been placed on the total duration of decompression (including ascent) for some courses, according to the following table:
– Decompression Techniques max 30 minutes
– Accelerated Decompression Techniques max 45 minutes