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VDL (E3.1) 10/2020 Page 73/196
7.4.2 Tests of technical ventilation systems, gas warning devices, inerting devices, de-
vices, protective systems or safety, control or regulating devices, and other tech-
nical devices for explosion protection
Test content that has been checked and documented as part of conformity assessment procedures do not
need to be checked again. Verify the plausibility and completeness of documents.
The following points must generally be verified:
• Technical ventilation systems, gas warning devices, inerting devices with regard to their suitability, their
functionality, their interconnections, their installation conditions, their proper condition, and their instal-
lation / assembly
• Devices, protective systems, or safety, control, or regulating devices within the meaning of Directive
2014/34/EU on explosion protection with regard to their proper condition, their suitability, their intercon-
nections, their installation conditions, and their installation / assembly
• Safety, control, or regulating devices with relevance for explosion protection, which can also be located
outside the potentially explosive atmospheres, to determine whether ventilation systems, gas warning
devices, inerting devices ensure the proper exclusion of ignition sources and functionality.
• Calibration of the Pt 100 controller sensor and, if required, subsequent adjustment is to be made before
commissioning the chamber as well as part of the annual maintenance. The procedure is described in
the Service manual (customer version).
• Ex devices in the sense of TRGS 725, whether they ensure the necessary functional reliability of the
measures.
• Connection elements and other technical devices (such as lightning protection, requirements for floors)
with regard to their condition, their interconnections, and their installation / assembly for explosion safety
(e.g. type of installation, insulation resistance of electrical cables and lines)
• Take into account the significant interactions of devices, protective systems, safety, control, or regulating
devices and their connecting elements – with each other and with other system parts. This includes, for
example, testing the equipotential bonding, the involvement of pipes in equipotential bonding, overvolt-
age protection, and lightning protection, alignment of units (e.g. pump-coupling-motor).
7.5 Inspection after changes requiring review
There is a need for a change requiring review if the explosive safety of the explosive system is affected by
the change. Changes requiring review are evaluated in accordance with applicable national regulations (for
Germany in particular: TRBS 1123). Checks after a change requiring review may be limited to the changes
made. Verify whether the system in the potentially explosive area has been changed in accordance with
this regulation and is working properly. See the requirements in Chap. 7.4.
7.6 Recurring tests for the explosive safety of the system
Objective of testing: The recurring tests serve to maintain the explosive safety of the Ex system. Among
other things, the actual state of the system is compared with the target state (according to the explosion
protection document and available test records).
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