Siemens SIPART PS2 Operating Instructions Manual page 284

Glossary
NEMA
National Electrical Manufacturers Association. NEMA is a standardization institute in the
USA. NEMA was formed in 1926 with the merge of Associated Manufacturers of Electrical
Supplies and the Electric Power Club.
NEMA 4
An enclosure standard of the National Electrical Manufacturers Association. NEMA 4-
compliant devices are suitable for use in indoor and outdoor applications. Protection is
provided against dust particles, rain as well as spray and splash water.
NEMA 4x
The same protection as NEMA 4. Additional protection of the enclosure from corrosion.
Parameter assignment
Individual parameter settings are specifically changed to adjust the positioner as per the
actuator or other requirements. Parameter assignment is carried out after the complete
commissioning of the positioner.
Piezoelectric effect
Name of a physical phenomenon. Due to mechanical compression loads on a crystal, an
electric potential develops on specific crystal surfaces. In a reverse case, applying an electric
field to specific crystal surfaces leads to crystal deformation.
Potentially explosive atmosphere
Mixture of air, combustible gases, fluff, fibers or dusts.
Pressure chamber
The pneumatic actuators are available in single and double-acting versions. In a single-
acting version, only one pressure chamber is pressurized and depressurized. The pressure
developed works against a spring. In a double-acting version, two pressure chambers work
against each other. Pressurizing the volume of one chamber simultaneously depressurizes
the volume of the other.
Process Device Manager
PDM is a Siemens software package for configuration, parameter assignment,
commissioning and maintenance of network configurations and field devices. Part of
SIMATIC STEP 7. Used for configuration and diagnostics.
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SIPART PS2 with and without HART
Operating Instructions, 02/2016, A5E00074631-AB