The following applies for work in hazardous areas (all zones):
-
The pulse generators of the turbine meter must be connected to intrin-
sically safe power circuit only.
-
Only tools that are approved for Ex Zone 1 are permitted for mainte-
nance and repair tasks.
-
Otherwise, work must only be carried out when there is not an explo-
sive atmosphere.
-
The risk of ignition due to impact or friction must be avoided.
-
Work on devices which are used in hazardous areas must be carried
out by qualified electrical engineers with special capabilities for work
in hazardous areas.
-
The wiring / installation in hazardous areas must only be carried out by
trained personnel in accordance with EN60079-14 and in observance of
national regulations.
-
Qualified persons must satisfy the definitions in accordance with DIN
EN 0105 or IEC 364 or directly comparable standards.
-
If one or more power circuits are used, it must be ensured that the per-
missible limit values according to the EC type approval certificate are
not exceeded when choosing the cables.
- Every Ex signal circuit must be routed with a dedicated cable which
must be guided through the appropriate PG screw coupling.
-
Permanent installation of the intrinsically safe cable is mandatory.
In addition, the following applies for work in hazardous areas (all zones):
-
Only trained and instructed personnel are permitted. Work on the
measuring system must only be carried out from qualified persons and
inspected by responsible qualified supervisors.
-
Qualified persons have been authorized by the person responsible for
safety of personnel to carrying out such work on the basis of their
training, experience or instruction and familiarity with applicable
standards, provisions, accident prevention regulations and system
conditions. It is essential that these persons are able to recognize and
avoid potential dangers in good time.
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