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06/12/2019 TR - ECE - BA - GB - 0142 - 01 Page 13 of 29
2.7 Usage in explosive atmospheres
The standard measuring system must be installed in an appropriate explosion protection enclosure as
required when used in explosive atmospheres.
The products are labeled with an additional marking on the nameplate.
The “intended use” as well as any information on the safe usage of the ATEX-compliant measuring
system in explosive atmospheres are contained in the User Manual.
Standard measuring systems that are installed in the explosion protection enclosure and are intended
for use with safety instrumented applications can therefore be used in explosive atmospheres.
When the measuring system is installed in the explosion protection enclosure, which means that it
meets explosion protection requirements, the properties of the measuring system will no longer be as
they were originally.
Following the specifications in the User Manual, please check whether the properties defined in
that manual meet the application-specific requirements.
Fail-safe usage requires additional measures and requirements. Such measures and requirements
must be determined prior to initial commissioning and must be taken and met accordingly.
2.8 Combination measuring system and draw-wire box (CDW582)
➊: Measuring system
Device type 1 with SIL value or PL value
➋: Draw-wire box
Device type 3 with B10d value
Figure 1: Combination measuring system and draw-wire box
From a safety viewpoint the combination of measuring system and draw-wire box is a series
connection with a device type 1 (measuring system) and a device type 3 with a category 1 structure in
accordance with EN ISO 13849-1 (draw-wire box).
Device type 1 is characterized by the fact that the device can already be used as the safety-relevant
part of a control system.
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