With dynamic monitoring, ROSS DM1 Series C Valve can be used in Category 4 PL e applications that do not require dynamic memory. Base-mounted unit is available in port sizes from ½–1 in. ROSS DM2® Series C Explosion Proof Valve, featuring dynamic monitoring and dynamic memory, is suited for Category 4 PL e applications in Ex m II T4 and Div 1 hazardous locations. Control Reliable Energy Isolation Valves enable rapid exhaust of downstream air when de-energized to remove stored energy.