Siemens SIPART PS2 Series Operating Instructions Manual page 326

Glossary
Chamber
A largely or completely enclosed cavity in a machine or apparatus.
Conduit piping system
A piping system for the American market, wherein the electric and pneumatic lines are
protected by a casing.
Configuring
See parameter assignment.
Control fitting
A valve consisting of an actuator + control valve + positioner.
Decrement
From the Latin word decrementare, decrease. Decrement is the defined amount of change
when decreasing a variable gradually. IT term that refers to a step-by-step decrease in a
numeric value.→Increment.
Degree of protection
The degree of protection of a device indicates the extent of protection. The extent of protection
includes the safety of persons against coming in contact with live or rotating parts, and the
protection of electric resources against the penetration of water, foreign bodies and dust. The
degrees of protection of electric machines are indicated by an abbreviation comprising two
letters and two numbers (e.g. IP55). The degree of protection is coded using the IP code. The
degrees of protection are standardized in DIN EN 60529.
Device category 1
Category 1 devices must be procured such that they ensure an extremely high degree of safety.
Devices in this category must ensure an extremely high degree of safety even for faults that
occur rarely. Even if two faults occur in the device, it should not lead to ignition. Devices in this
category are suitable for use in zone 0 or 20.
Device category 2
Category 2 devices must be procured such that they ensure a high degree of safety. Devices
in this category must ensure the required degree of safety in case of frequent faults or ones that
can be normally expected, e.g. defects in the device, and avoid ignition sources. Devices in this
category are suitable for use in zone 1 or 21.
326
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE