WIKA TR Serie Instructions Complémentaires page 13

3. Commissioning, operation
3.5.2 Possible installation methods with the marking II 1/2 Ex ia IIC T1 ... T6 Ga/Gb
or II 1/2D Ex ia IIIC T65 ... T125 °C Da/Db
Zones 0, 1, 2 or
zones 20, 21, 22
Thermowell
TWxx
Thermowell
TWxx
The sensor or thermowell tip protrudes into zone 0. The case or connection head is in
zone 1 (zone 21) or zone 2 (zone 22). It is sufficient to use an Ex ib type circuit.
Zone separation is guaranteed if sufficiently tight (IP66 or IP67) process connections are
used.
Examples of suitable process connections include gas-tight standardised industrial
flanges, threaded connections or pipe connections.
The welded parts, process connections, compression fittings, thermowells or cases used
must be designed such that they withstand all influencing variables resulting from the
process, such as temperature, flow forces, pressure, corrosion, vibration and impacts.
WIKA additional information, models TRxx and TCxx (Ex i)
Zones 1, 2 or
zones 21, 22
Process
connection
Compression
fitting
welded
Process
connection
Connection head/
Field case
Hazardous area
Tx10-H
Tx10-A
Option:
with built-in
transmitter
e.g. T32
Tx10-H
Tx10-A
Tx10-C
Tx10-D
Tx10-A
Tx10-B
Tx10-C
Tx10-A
Non-hazardous area
Associated
electrical equipment
Intrinsically
safe supply or
suitable barrier
Intrinsically
safe supply or
suitable barrier
Intrinsically
safe supply or
suitable barrier
Intrinsically
safe supply or
suitable barrier
EN
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