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Digital
Representation of a variable in the form of characters or numbers. The functional course of
an originally changeable analog variable is simulated in predefined stages. Predefined
values are assigned to these stages. Opposite to "analog".
Drive chamber
For pneumatic actuators which consist of two pressure chambers in double-acting versions
and of a pressure chamber and a spring chamber in single-acting versions.
EEPROM
EEPROM (Electrically Erasable Programmable Read-Only Memory; literally: elektrisch
löschbarer, programmierbarer Nur-Lese-Speicher in German) is a non-volatile electronic
memory. EEPROMs are often used when individual data bytes change over long time
periods and need to be saved in a manner protected against power failure, e.g. configuration
data or operating hours counters.
Electromagnetic compatibility
Definition as per the EMC law: EMC is the capability of a device to work satisfactorily in the
electromagnetic environment without causing electromagnetic interferences that are
unacceptable for other devices present in this environment.
Ex d
"Flameproof enclosure" type of protection. When the potentially explosive mixtures enter the
enclosure of a resource and an ignition source exists in the enclosure. The transfer of the
explosion inside the enclosure to the surrounding space must be ruled out.
● d: flameproof enclosure
Ex ia / Ex ib / Ex ic
If potentially explosive mixtures enter the enclosure of a resource, it should not lead to
ignition. Demarcation of energy and increased temperatures.
Ex n
Equipment containing energy-limiting, non-sparking contacts as well as circuits whose
contacts are supplied with limited energy.
Ex t
Dust ignition protection with "t" enclosure. Dust ignition protection where the electric
equipment has an enclosure providing protection against dust ingress and a measure for
limiting the surface temperature.
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12
Glossary
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