WIKA TR25 Betriebsanleitung Seite 19

7. Information on mounting and operation in hazardous areas
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 Ambient temperature range (T
T6 (-50) -40 ... +80 °C
T5 (-50) -40 ... +80 °C
T4, T3 (-50) -40 ... +80 °C
See and observe the permissible ambient temperatures and surface temperatures for third-
party products from the relevant approvals and/or data sheets.
Example
For instruments fitted with a DIH10 transmitter and digital display, for example, the following
limit for temperature class classification applies:
Temperature class Ambient temperature range (T
T6 -40 ... +60 °C
For applications that require Group II instruments (potentially explosive dust atmospheres),
the following surface temperatures and ambient temperature ranges apply:
Power Pi Ambient temperature range (T
750 mW (-50) -40 ... +40 °C
650 mW (-50) -40 ... +70 °C
550 mW (-50) -40 ... +80 °C
See and observe the permissible ambient temperatures and surface temperatures for third-
party products from the relevant approvals and/or data sheets.
The values in brackets apply to special designs. These sensors are manufactured using
special sealing compounds. Moreover, they are equipped with connection heads made of
stainless steel and cable glands for the low-temperature range.
These thermometers are suitable for temperature classes T6 ... T3 in accordance with the
approval certificate. This applies to instruments without built-in transmitters and/or digital
displays. Thermometers equipped with transmitters and/or digital displays are for use in
temperature classes T6...T4 and are marked accordingly. Using equipment for applications
which require a lower temperature class (e.g. T2) than the marked one is permissible. In
doing so, it must be ensured that the maximum ambient temperature for safe operation of
the instrument is not exceeded.
WIKA operating instructions model TR25 (Ex i)
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