WIKA TR12 Serie Manual De Instrucciones página 13

3. Commissioning, operation
Electrical data with built-in transmitter in accordance with the FISCO model
■
The transmitters/digital displays used for the application range in accordance with the
FISCO model are considered FISCO field instruments. The requirements in accordance
with IEC/EN 60079-27, and the connection conditions of the approvals in accordance
with FISCO, apply.
3.3 Temperature class classification, ambient temperatures
The permissible ambient temperatures depend on the temperature class, the case used
and the optional built-in transmitter and/or digital display.
When a thermometer is connected to a transmitter and/or a digital display, the lowest value
of either the ambient temperature limits or the highest temperature class will apply. The
lower temperature limit is -40 °C; and -50 °C for special designs.
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.
Example
For instruments fitted with a DIH50 transmitter and digital display, for example, the following
limit for temperature class classification applies:
Temperature class
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.
The values in brackets apply to special designs. These probes 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.
WIKA additional information TR12/TC12, intrinsically safe designs (Ex i)
Ambient temperature range (T
(-50) -40 ... +80 °C
Ambient temperature range (T
-40 ... +55 °C
)
a
)
a
EN
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