WIKA TR10-C - Handbuch (Seite 24)

14106886.01 06/2014 GB/D
24 WIKA operating instructions resistance thermometers and thermocouples, Ex n
GB
J) Electrical screening may only be grounded at one end, and outside of the Ex area.
The housing must be grounded against electromagnetic fields and electrostatic discharge.
Mounting within metallic enclosures:
The screen must be fully coupled to the equipotential bonding of the connected enclosure.
Mounting within non-metallic enclosures:
All electrically connected thermometer components within the hazardous area must be
provided with equipotential bonding.
K) When mounting thermometers with flying leads (e.g. models TR40, TC40, TR50, TC50),
installation personnel must ensure that installation is carried out properly and in compliance
with the appropriate regulations.
7.1.1 Special conditions of use (X conditions)
A) Equipment category classification
Max. surface
temperature and
temperature class
Max. temperature in °C
at the thermowell /
measuring insert
Minimum neck
length Mh 1)
Ambient
temperature
range T
a
2)
T80 °C or T6 78 - -20 ... +55 °C
T95 °C or T5 93 - -20 ... +70 °C
T130 °C or T4 128 20 mm -20 ... +80 °C
T195 °C or T3 193 50 mm -20 ... +80 °C
T290 °C or T2 288 100 mm -20 ... +80 °C
T440 °C or T1 438 100 mm -20 ... +80 °C
1) The minimum neck length is defined as the distance between the lower edge of the connection head and the
heat-emitting surface.
2) The ambient temperature range, Tamb, may be further limited by the transmitter fitted.
B) The models TR40, TC40, TR50, TC50 cable probes must be fitted with kink protection, strain
relief and mechanical protection.
C) The models TR40, TC40, TR50, TC50 cable probes should only be operated up to the
transition sleeve in hazardous areas. The connection side (plastic piping) must be kept outside
of the hazardous area.
D) The models TR40, TC40, TR50, TC50 cable probes must be connected to ground through
their installation.
E) The transmitter used must have a valid declaration in accordance with the 94/9/EC guidelines,
related to their equipment classification (see table “Equipment category classification”).
F) The temperature resistance of the connecting cables, the connection heads, the cable entries
and if necessary the blanking connectors must be at least as high as the max. permissible
ambient temperature.
7. Information on mounting and operation in hazardous areas