PRESSURISED ACCESS SAFETY SYSTEM (PASS)
Should the chamber’s fresh (mine) air supply be disconnected or compromised, the system’s external LED light will display red, indicating that the chamber is not positively pressurised and therefore unsafe for entry.
Once activated, the PASS will disperse controlled quantities of compressed air into the chamber until the internal pressure reaches 200 Pa. By ensuring that the pressure inside the refuge is slightly greater than outside, toxic contaminants are prevented from infiltrating the chamber during entry of personnel.
POSITIVE PRESSURE MAINTENANCE SYSTEM (PPMS)
The quantity of compressed breathable air cylinders is configurable to suit various internal volumes and durations of operation.
MineARC TunnelSAFE Refuge Chambers offer the PASS and PPMS as standard features, however all other refuge chambers can be upgraded to include the systems.