Ex Marking - WIKA TR25 Mode D'emploi

3. Safety

3.7 Ex marking

DANGER!
Danger to life due to loss of explosion protection
Non-observance of these instructions and their contents may result in the
loss of explosion protection.
▶ Observe the safety instructions in this chapter and further explosion
protection instructions in these operating instructions.
▶ Observe the information given in the applicable type examination
certificate and the relevant country-specific regulations for installation and
use in hazardous areas (e.g. IEC/EN 60079-10 and IEC/EN 60079-14).
Check whether the classification is suitable for the application. Observe the relevant
national regulations.
ATEX
IECEx
II 1G Ex ia IIC T3 ... T6 Ga
II 1/2G Ex ib IIC T3 ... T6 Ga/Gb
II 1D Ex ia IIIC T65 °C / T95 °C / T125 °C Da
II 1/2D Ex ib IIIC T65 °C / T95 °C / T125 °C Da/Db
For applications without transmitter (digital displays) requiring instruments of equipment
group II (potentially explosive gas atmospheres), the following temperature class
classification and ambient temperature ranges apply:
Table 1
Marking
II 1G Ex ia IIC T6 Ga
II 1/2G Ex ib IIC T6 Ga/Gb
II 1G Ex ia IIC T5 Ga
II 1/2G Ex ib IIC T5 Ga/Gb
II 1G Ex ia IIC T4 Ga
II 1/2G Ex ib IIC T4 Ga/Gb
II 1G Ex ia IIC T3 Ga
II 1/2G Ex ib IIC T3 Ga/Gb
1) The values in brackets apply to special designs. These probes are manufactured using special sealing
compounds. Moreover, they feature cases made of stainless steel and cable glands for low-temperature ranges.
WIKA operating instructions model TR25 (Ex i)
Tempera- Ambient
ture class temperature
range (T
T6 (-50) -40 ... +80 °C
1)
T5 (-50) -40 ... +80 °C
1)
T4, T3 (-50) -40 ... +80 °C
1)
Max. surface temperature
(T ) at the probe or
max
) thermowell tip
a
T (medium temperature) +
M
self-heating
For this, the special conditions
(17) must be observed.
EN
13