WIKA TR21 Serie Informations Complémentaires page 5

1. Ex marking
For applications without transmitters (models TR21-x-xPx and TR21-x-xRx) that require
group II instruments (potentially explosive gas atmospheres), the following temperature
class classification and ambient temperature ranges apply:
Table 1
Marking
ATEX IECEx
II 1G Ex ia IIC T1 ... T6 Ga
II 1/2G Ex ia IIC T1 ... T6 Ga/Gb
II 2G Ex ia IIC T1 ... T6 Gb
For applications requiring instruments of equipment group II (potentially explosive dust
atmospheres), the following surface temperatures and ambient temperature ranges apply:
Table 2
Marking
ATEX IECEx
II 1D Ex ia IIIC T135 °C Da
II 1/2D Ex ia IIIC T135 °C Da/Db
II 2D Ex ia IIIC T135 °C Db
WIKA additional information model TR21 (Ex i)
Temperature Ambient
class temperature
range (T
T1 ... T5 -50 ... +85 °C
T6 -50 ... +80 °C
Power P Ambient
i
temperature
range (T
750 mW -50 ... +40 °C
650 mW -50 ... +70 °C
550 mW -50 ... +85 °C
Max. surface temperature
(T ) at the sensor or
max
) thermowell tip
a
T (medium temperature) +
M
self-heating
For this, the special conditions
must be observed (see chapter
4 "Special conditions for safe
use (X conditions)").
Max. surface temperature
(T ) at the sensor or
max
) thermowell tip
a
T (medium temperature) +
M
self-heating
For this, the special conditions
must be observed (see chapter
4 "Special conditions for safe
use (X conditions)").
EN
5