JUMO 902820 PROCESStemp RTD Temperature Probe for Process Technology (Also with ATEX Approval) Ex i Operating Manual - Manual (Page 4)

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4 Conformance with standards
WARNING: This operating manual is only valid for the specified test certificate and the norms that
are associated with it.
Test certificate: SEV 09 ATEX 0120
EN 60079-0
2009
EN 60079-1 2007
EN 60079-7 2007
EN 60079-11 2012
EN 60079-26 2007
EN 60079-31 2009
Test certificate: SEV 09 ATEX 0121
EN 60079-0
2009
EN 60079-1 2007
EN 60079-11 2012
EN 60079-26 2007
EN 60079-31 2009
Table 1: Conformance with Standards
The JUMO quality management system to EN ISO 9001 is the basis for conformance with the EU guideline
94/9/EC Annex IV (ATEX). The RTD temperature probes have been developed, manufactured and tested in
accordance with the state of the art and in conformity with the applicable standards and regulations.
5 Technical data, explanation and case study
CAUTION: for specific data, see the attached technical data sheet/detail drawing and/or the label that
is affixed to these operating instructions
5.1 Intrinsically safe connection, type Ex "i" protection
The equipment used in areas with an explosion hazard only contains intrinsically safe circuits. A circuit is
intrinsically safe if, both in normal operation and in the event of a fault, a short-circuit of the circuit does not
produce a spark capable of causing ignition, and the current flowing through the equipment does not heat
any part of the surface above the level specified for the temperature class (see also EN 60079-11).
In order for a circuit to be designated as intrinsically safe, every individual device included in the circuit must
be designed to be intrinsically safe. Furthermore, it is necessary to test that the complete circuit configuration
of the (individually) intrinsically safe devices forms, as a whole, an intrinsically safe circuit. The fact that a
circuit is assembled from devices that are (individually) intrinsically safe, does not guarantee that the
circuit as a whole is intrinsically safe.
For instance, the sensing element in a RTD temperature probes carries a current during measurement. This
produces internal heating of the element, and, as a result, an increase in the temperature on the surface of
the protective fitting. So it is necessary to ensure that the limits of the given temperature class are not
exceeded.