User Documentation

Weidmüller Interface GmbH Co. KG; Klingenbergstraße 16, 32758 Detmold-Germany
Schedule of Limitations:
The WDU 2.5/TC range of Thermocouple Terminals is suitable for use in enclosures in atmospheres with
flammable gases or combustible dust. For flammable gases these enclosures must satisfy the requirements
according to EN 60079-0 and EN 60079-7. For combustible dust the enclosure must satisfy the requirements
according to EN 60079-0 and EN 60079-31.
Under normal operating conditions the temperature rise of the terminal blocks is maximum 40 K, measured at
the maximum permitted rated current. Due to the above mentioned, the terminal blocks may be used in
apparatus of temperature classes T6..T1 as long as the terminal block ambient temperature range is not
exceeded. No part of terminal block must exceed 110 °C under any condition.
T6 (- 60°C ... +40 °C)
T5 (- 60°C … +55 °C)
T4 (- 60°C ... +70 °C)
Essential Health and Safety Requirements:
Concerning ESRs this Schedule verifies compliance with the Annex III of ATEX directive only. By placing the
product on the market, the manufacturer declares compliance with other relevant Directives, and all other
safety related requirements including those of Annex II of this Directive.
Note:
If smaller cross sections than the rated cross section are used, the belonging lower current has to be laid down
in the IECEx/EC-Type Examination Certificate of the complete apparatus.
Mounting instructions:
The WDU 2.5/TC range of Thermocouple Terminals is suitable for application in enclosures in atmospheres
with flammable gases or combustible dust. For use in flammable gases these enclosures must satisfy the
requirements according to IEC/EN60079-0 and IEC/EN60079-7. For use in combustible dust these enclosures
must satisfy the requirements according to IEC/EN60079-0 and IEC/EN60079-31.
Regarding the use of accessories the instructions of the manufacturer must be followed.
When using the type WDU 2.5/TC range of Thermocouple Terminals especially with other terminal blocks
series or sizes or accessories the requirements for clearance and creepage distances according to table 1 of
EN 60079-7 must be observed. Regarding the use of covers, cross-connectors and end brackets the
instructions of the manufacturer must be followed.
For accessories, current rating, resistance across the terminal and torque values please refer to the table
under “technical data” above.
The terminal can be used with either one or two wires into either side of the terminal. When two wires are used
they must be of the same type, and of equal sizes. No other wire sizes or types than the ones specified in
instructions must be used. The terminal blocks must either be mounted next to another block of the same type
and size or with an end plate.
If smaller conductor cross sections than the rated conductor cross sections are used, then the corresponding
lower current shall be stated in the Certificate of the complete apparatus.
Unused terminals shall be tightened.
Version: WDU/WPE 2.5; 9924944 Index: 03 Date: 10.2018
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