Glossary
Actuator
Converter that converts electric signals into mechanical or other non-electric variables.
Actuator 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.
Analog
A signal type which represents data using continuously varying, measurable and physical
quantities, e.g. current or voltage. Opposite to digital. The range between 4 and 20 mA is often
used to transfer analog signals.
Analog-to-digital converter
An analog-to-digital converter is an interface between the analog environment and the digitally
working computers. Only then can the computers be used for measurement and control tasks.
Analog-to-digital converters convert analog input signals to digital signals. Analog
measurement data is thus converted into digital information. On the other hand, a digital-to-
analog converter coverts digital information into analog signals.
Asset Management Solution (AMS)
Software package by Emerson Process. The AMS Device Manager, which is somewhat similar
to the PDM, is the most significant part of the package.
ATEX
ATEX is the abbreviation of the French term "Atmosphère explosible". ATEX stands for the two
directives of the European Community in the field of explosion protection: the ATEX product
directive 2014/34/EU and the ATEX operation directive 1999/92/EC.
Auxiliary voltage
Auxiliary voltage is an electric supply or reference voltage that is required by some electric
circuits in addition to the standard supply. The auxiliary voltage can, for example, be specially
stabilized, have a particular level or polarity and/or other properties which are important for the
correct functioning of switch components. Auxiliary voltage is used, for example, with four-wire
systems.
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE 325
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