Siemens SIPART PS2 Operating Instructions Manual page 286

Glossary
SIMATIC software
Programs for process automation (e.g. PCS 7, WinCC, WinAC, PDM, STEP 7).
Zone 0
Area in which potentially explosive atmospheres build up often, regularly or over long
durations during the normal operation of a device.
Zone 1
Area in which potentially explosive atmospheres build up occasionally during the normal
operation of a device.
Zone 2
Area in which a potentially explosive atmosphere normally never builds up or builds up only
for a short while during the normal operation of a device.
Zone 20
Zone 20 is an area in which a potentially explosive atmosphere in the form of a cloud of
combustible dust in air is present continuously, over a long period, or frequently.
Zone 21
Zone 21 is an area in which a potentially explosive atmosphere in the form of a cloud of
combustible dust in air can be occasionally produced during normal operation.
Zone 22
Zone 22 is an area in which a potentially explosive gaseous atmosphere in the form of a
cloud of combustible dust in air never develops or develops only for a short while during
normal operation.
286
SIPART PS2 with and without HART
Operating Instructions, 02/2016, A5E00074631-AB