WIKA TR Serie Instructions Complémentaires page 10

3. Commissioning, operation
TC95 and TR95 multipoint thermocouples
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Assembly of multipoint thermocouples from individual sheathed elements
For the individual ungrounded sheathed element, the values mentioned in 3.2.1 apply.
For operationally grounded multipoint thermocouples, the sum of all the sensors must
comply with the above-mentioned values. For applications in dust areas, observe the
EN
values from "table 2" (column 2) in chapter 1 "Ex marking".
3.3 Temperature class classification, ambient temperatures
The permissible ambient temperatures depend on the temperature class, the cases used
and the optionally built-in transmitter and/or digital display.
Where there are neither transmitters nor digital displays mounted within the case, there will
also be no additional warming. With a built-in transmitter (optionally with digital display),
heating caused by operating the transmitter or digital display may occur.
For applications without transmitters (digital displays) that require group II instruments
(potentially explosive gas atmospheres), the following temperature class classification and
ambient temperature ranges apply:
Temperature class
T1 ... T6
The permissible ambient temperatures and surface temperatures for third-party products
can be seen from the relevant approvals and/or data sheets and must be observed.
For applications requiring instruments of equipment group II (potentially explosive dust
atmospheres), the following ambient temperature ranges apply:
Power P Ambient temperature range (T
i
750 mW (-50) -40 ... +40 °C
650 mW (-50) -40 ... +70 °C
550 mW (-50) -40 ... +80 °C
The values in brackets apply to special designs. These sensors are manufactured using
special sealing compounds. Moreover, they feature connection heads made of stainless
steel and cable glands for low-temperature ranges.
According to approval, these thermometers are suitable for the temperature classes
T1 ... T6. This applies for instruments with or without built-in transmitters and/or digital
displays. Make sure the maximal ambient temperature for the safe use of the instrument is
not exceeded.
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Ambient temperature range (T
(-50) -40 ... +80 °C
WIKA additional information, models TRxx and TCxx (Ex i)
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