EN
14280102.02 02/2023 EN/DE/FR/ES
WIKA additional operating instructions TR12/TC12, intrinsically safe designs (Ex i) 5
For applications without transmitters (digital indicators) requiring instruments of equipment
group II (potentially explosive gas atmospheres), the following temperature class classifica-
tion and ambient temperature ranges apply:
Table 1
Marking Tempe-
rature
class
Ambient tempe-
rature range (Ta)
Max. surface
temperature
(Tmax) at the probe or
thermowell tip
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
T1 ...T6 (-50) 1) -40 ... +80 °C
[(-58) 1)-40 ... +176 °F]
TM(medium temperature) +
self-heating
For this, the special condi-
tions must be observed (see
chapter 4 „Besondere Bedin-
gungen für die Verwendung
(X-Conditions)“).
For applications requiring instruments of equipment group II (potentially explosive dust
atmospheres), the following surface temperatures and ambient temperature ranges apply:
Table 2
Marking Power
Pi
Ambient tempe-
rature range (Ta)
Max. surface
temperature
(Tmax) at the probe or ther-
mowell tip
ATEX IECEx
II 1D Ex ia IIIC T1 ... T6 Da
II 1/2D Ex ia IIIC T1 ...T6 Da/Db
II 2D Ex ia IIIC T1 ... T6 Db
750 mW (-50) 1) -40 ... +40 °C
[(-58) 1)-40 ... +104 °F] TM(medium temperature) +
self-heating
For this, the special conditions
must be observed (see chapter 4
„Besondere Bedingungen für die
Verwendung (X-Conditions)“).
II 1D Ex ia IIIC T1 ... T6 Da
II 1/2D Ex ia IIIC T1 ...T6 Da/Db
II 2D Ex ia IIIC T1 ... T6 Db
650 mW (-50) 1) -40 ... +70 °C
[(-58) 1)-40 ... +158 °F]
II 1D Ex ia IIIC T1 ... T6 Da
II 1/2D Ex ia IIIC T1 ...T6 Da/Db
II 2D Ex ia IIIC T1 ... T6 Db
550 mW (-50) 1) -40 ... +80 °C
[(-58) 1)-40 ... +176 °F]
1) The values in brackets apply to special versions.These probes are manufactured using special potting compounds. Moreo-
ver, they feature cases made of stainless steel and cable glands for low-temperature ranges.
When there is a built-in transmitter and/or a digital indicator, the special conditions from
the type examination certificate (see chapter 4 „Special conditions of use (X conditions)“)
apply.
1. Ex marking
