WIKA TR10-A - Handbuch (Seite 20)

3345267.12 01/2014 GB/D
20 WIKA operating instructions RTD and TC, intrinsically safe designs (Ex i)
GB
6.3.2 Thermocouples with cable or connector
Lemosa connector,
male at the cable
Binder connector,
male at the cable
(screw/plug-in connection)
Single
thermocouple
For the marking of
the cable ends, see
table
Cable
Dual
thermocouple
Plus and minus are marked.
For dual thermocouples, two thermal
connectors are used.
Thermal connector
6.4 Multipoint thermocouples (as per 8.4)
They are usually equipped with a housing in which transmitters or terminal blocks are mounted.
The transmitters/digital displays are fastened mechanically (e.g. rail system in housing or holder
in connection head) and installed in accordance with EN/IEC 60079-11 and EN/IEC 60079-14.
Optionally, depending on design, the housings can be equipped with or without terminals (e.g.
terminal blocks, etc.) in accordance with EN/IEC 60079-11 and EN/IEC 60079-14.
When using several transmitters/digital displays, the housing volume increases as a function of
the “heat source”, thus increasing the volume to be heated. This guarantees that the housing
surface temperature does not increase significantly.
WARNING!
When using no terminals and line wiring, compliance with the installation regulations
in accordance with EN/IEC 60079-11 and EN/IEC 60079-14 must be guaranteed.
6.5 Cable glands
In thermometers equipped with connection heads, the cable glands must be fully sealed in order
to ensure that the necessary ingress protection is reached.
Requirements for meeting ingress protection
■ Only use cable glands within their indicated clamping range (cable diameter suitable for the
cable gland)
■ Do not use the lower clamping area with very soft cable types
■ Only use circular cross-section cables (if necessary, slightly oval in cross-section)
■ Do not twist the cable
6. Commissioning, operation