Control the atmosphere or exclude combustible dust
- Ex p
The protective gas and maintained pressure inhibit entry of a hazardous atmosphere. Control and monitoring follow the assessed arrangement.
- Purge / pressurization
Purging removes the previous atmosphere; pressurization maintains a pressure relationship. The two steps are not interchangeable.
- Ex t
The enclosure limits dust entry and controls external surface temperature. Check dust group, protection level and the complete entry assembly.
- Conductive dustThis term
Conductivity is determined under the governing classification method. Dust bridging and ingress are concerns even when the dust does not look metallic.
Purging replaces the internal atmosphere; pressurization maintains the specified pressure relationship. Dust enclosure protection also controls dust ingress and external surface temperature.
Conceptual gas and dust paths. These concepts have different monitoring and installation requirements; no pressure, purge volume, dust threshold or protection level is specified.