WIKA TR12 Serie Manual De Instrucciones página 11

3. Commissioning, operation
3.1.3 Variant 3
The thermometer is fitted to certified equipment (transmitter). The thermometer is marked
with II 2G Ex ia IIC Tx Gb and is designed for use in zone 1 with a thermowell. For any
potential usage at the partition to zone 0 with a thermowell, the approvals and conditions of
the relevant transmitters must be considered.
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ATEX/IECEx Ex i certified temperature transmitters
The evaluation is carried out via a current (4 ... 20 mA), voltage (0 ... 10 V) or fieldbus
signal, which is generated by an ATEX/IECEx Ex i certified temperature transmitter.
Use in zone 1, marking II 2G Ex ia IIC Gb
The case or the connection head is in zone 1 (or zone 2). The sensor is located in zone 1.
The main marking for models TR12-B and TC12-B are found on the certified connection
housing or Ex i field transmitter.
The TR12-M and TC12-M modules are marked through a foil plate on the neck tube.
For a possible use at the partition to zone 0 with a thermowell, the approvals and
conditions of the relevant Ex i field transmitters must be followed.
3.1.4 Use in methane atmospheres
As a result of the higher Minimum Experimental Safe Gap (MESG) and Minimum Ignition
Current (MIC) of methane, the instruments can also be used in potentially explosive gas
atmospheres caused by this.
U = see third-party transmitter approval
i
I = see third-party transmitter approval
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P = see third-party transmitter approval
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L = see third-party transmitter approval
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C = see third-party transmitter approval
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WIKA additional information TR12/TC12, intrinsically safe designs (Ex i)
EN
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