Siemens SIPART PS2 Series Operating Instructions Manual page 331

Sensor
Converter that converts mechanical or other non-electric variables into electric signals.
SIMATIC software
Programs for process automation (e.g. PCS 7, WinCC, WinAC, PDM, STEP 7).
Type 4X
according to UL 50E. This standard contains additional requirements relating to the design and
performance of enclosures which are to be used indoors and outdoors.
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.
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE
Glossary
331