JUMO 902820 User Manual
RTD temperature probes
Ex „e“ for use in areas
with an explosion hazard
Persons concerned:
Experienced professional electricians
as per EU Directive 1999/92/EC
and trained personnel
B 902820.0.1
B 902821.0.1
B 902xxx.0.1
Operating Manual
2012-06-28/00456135
Contents
1 Equipment and intended application ............................................................................................ 2
2 Marking............................................................................................................................................. 2
3 Safety notes...................................................................................................................................... 2
4 Conformance with standards......................................................................................................... 3
5 Technical data, explanation and case study ................................................................................ 3
5.1 Intrinsically safe connection, Ex “i” protection..................................................................... 3
5.2 General information on the types of protection .................................................................... 5
5.3 Flameproof enclosure, Ex “d” protection ............................................................................. 5
5.4 Increased safety, Ex “e” protection ....................................................................................... 6
5.5 Use in areas with a dust explosion hazard ........................................................................... 6
6 Installation........................................................................................................................................ 8
7 Maintenance .................................................................................................................................... 8
8 Connections for RTD temperature probes ................................................................................... 9
Attachments: Declaration of conformity, data sheet/detail drawing
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1 Equipment and intended application
RTD temperature probes from JUMO are used as operating equipment for temperature measurement in
liquid or gaseous media, as well as dusts, with the protection types: intrinsic safety “i”, flameproof enclosure
“d” or increased safety “e”. The thermometers consist of a protection fitting with various process connection
options, a terminal head or a connecting cable, and an interchangeable measuring insert (depending on the
type). All fittings in contact with the process media undergo a leakage test. The Pt100 temperature sensors
mounted in the fittings are to EN 60751, in tolerance classes A or B in 2-, 3-, or 4-wire circuit (see Section 8).
It is also possible to use these sensors with a higher reference value (Pt500; Pt1000; Pt2000; Pt 5000). NTC
sensors, such as KTY, or other PTC sensors can also be used. Versions with two or three measurement
circuits are possible. A transmitter can be built into the terminal head, for measurement transmission with a
standard signal (e.g. 4 to 20 mA).
The thermometers fulfill the requirements for Explosion Group II in Categories 1 G and 1 D, as well as 2 G
and 2 D. They are thus suitable for use in areas with an explosion hazard: Zone 1 and 2 with gas (Gas) and
Zone 21 and 22 with dust (Dust). Depending on the circumstances, it may be permissible for the probe stem
to protrude into Zone 0 or 20 (zone separation).
The thermometer parameters that are specific to a given type can be found in the corresponding
technical data sheet/detail drawing (see attachment) and/or on the label affixed to these operating
instructions.
Depending on the measurement task and the application requirements, the RTD temperature probes are
available with different terminal heads, a variety of process connections, matching pockets, with or without
an interchangeable insert, or with a fitted connecting cable.
RTD temperature probes with type Ex “i” protection are certified for connection to intrinsically safe circuits in
Category ib (for use in Zones 1 and 2, with an isolator in Zone 0) and in Category ia (where the probe stem
is in Zones 0, 1 and 2).
RTD temperature probes in a flameproof enclosure (terminal head and cable gland) as well as with
“Increased safety” are also equipped with intrinsically safe measuring inserts for connection to intrinsically
safe circuits.
When connecting up to circuits that are not intrinsically safe, the user must ensure that the power applied is
limited in such a way that the maximum rise in surface temperature is no greater than that specified for the
temperature class minus the safety reserve.
See also Section 5 “Technical data” of these operating instructions.
2 Marking
The type of the RTD temperature probe used is marked on the terminal head or the permanently attached
nameplate. For every RTD temperature probe that carries an individual type designation (e. g.
90.2800.9101), there is a corresponding probe-specific drawing or data sheet. The appropriate marking
ensures that all sensors are unambiguously identifiable and traceable. The probe-specific values can be
found in the drawing, the technical data sheet and/or the label that is affixed to these operating instructions.
3 Safety notes
The technical data that are relevant to the use of the device in an area with an explosion hazard (Ex area)
are presented in the detail drawing/corresponding data sheet and/or the label that is affixed to these
operating instructions.
Only operate RTD temperature probes according to their intended use and in a clean and undamaged state!
It is not permissible to make any alterations to the RTD temperature probes. In such a case, proper fault-free
operation is no longer assured. The guarantee is also invalidated by any alterations. When exchanging
measuring inserts, use only original JUMO replacement parts of the same type.
The national and international safety and accident prevention regulations must be followed for installing and
working on or with the RTD temperature probes. Furthermore, the operator of the plant or installation is
responsible for the observance of legal requirements. If lead extensions are used, the specified (lengthdependent) limits for capacitance and inductance must be observed.
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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 05 ATEX 0137
EN 60079-0 2009
EN 60079-1 2007
EN 60079-7 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 Directive
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 conformance 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, 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 in 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 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 a RTD temperature probe the measuring current (or in case of malfunction the residual current) flows
through the sensor element. The result is self-heating of the element and ultimately temperature increase on
the surface area of the protection fitting. It is essential to ensure that the limit of the defined temperature
class is not exceeded.
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