Temperature Class - WIKA TR Serie Información Adicional

1. Ex marking
The thermometer model TRxx/TCxx will be mounted to an certified case
(TÜV 18 ATEX 211394 U and IECEx TUN 18.0010U) manufactured by WIKA
series 1/4000, series 7/8000 or series 5/6000. The case and covers are made of stainless
steel or aluminium. The cover could be optionally provided with a glass lens (window).
Alternatively, the thermometers TRxx/TCxx can be mounted to other suitable
certified cases in accordance with the applicable requirements of IEC/EN 60079-0,
IEC/EN 60079-7, IEC/EN 60079-15 and IEC/EN 60079-31. The electrical connection is
made via Ex e or Ex t approved components.
Optionally, a suitable certified transmitter respectively a suitable certified current loop
indicator may be placed inside the case.
The maximum surface temperature at the tip of the probe respectively at the tip of the
thermowell is the same as media temperature plus 4 K.
The permissible ambient temperatures are depending on the marking of the temperature
class, the used case and - for zone 2 only - the assembly with an optional transmitter and/or a
digital display. In this case the special conditions for safe use must be considered. The lower
temperature limit is -40 °C, for special models the lower temperature limit is -60 °C.
For the connection of a thermometer and a transmitter and /or a digital display the minor
values of the ambient temperature limits and the temperature class with the highest cipher
is valid.
The thermometer must be suitable for the thermal and mechanical stress within the
process. As the case may be a thermowell with a proper minimum wall thickness may be
used.
1.1 Marking according to EU type-examination certificate
1.1.1 For applications that require EPL Gb equipment
For applications without transmitter (digital displays) that require group II instruments, the
following temperature class classification and ambient temperature ranges apply:
Table 1: Temperature class gas applications (EU type-examination certificate)
Marking
II 2G Ex eb IIC T6 Gb
II 3G Ex ec IIC T6 Gc
II 3G Ex nA IIC T6 Gc
II 2G Ex eb IIC T5 ... T1 Gb
II 3G Ex ec IIC T5 ... T1 Gc
II 3G Ex nA IIC T5 ... T1 Gc
WIKA additional information, models TRxx and TCxx (Ex nA, Ex ec, Ex eb, Ex tc, Ex tb)
Temperature Ambient
class temperature
range (T
T6 -40 ... +80 °C
-60 ... +80 °C
T5 ... T1 -40 ... +80 °C
-60 ... +85 °C
Maximum surface
temperature (T
) the tip of the probe or
1)
a
thermowell
T (medium temperature)
M
+ self-heating 4 K
EN
) at
max
5