WIKA TC12-M - Handbuch (Seite 25)

GB
7. Information on mounting and operation in hazardous areas
14083458.01 09/2013 GB/D
WIKA operating instructions models TR12, TC12 (Ex i) 25
7.1.2 Ex marking
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:
Table 1
Zone Medium Marking
1 Gas II 2G Ex ia IIC T3 ... T6 Gb
1 Mounting to zone 0 Gas II 1/2G Ex ia IIC T3 ... T6 Ga/Gb
0 Gas II 1G Ex ia IIC T3 ... T6 Ga
Temperature
class
Ambient temperature
range (Ta)
Max. surface temperature (T
max
) at the
sensor or thermowell tip
T6 (-50) 1) -40 ... +80 °C T
M
(medium temperature) + self-heating
For this, the special conditions (17) must be observed.
T5 (-50) 1) -40 ... +95 °C
T4, T3 (-50) 1) -40 ... +100 °C
1) The values in brackets apply to special designs. These sensors are manufactured using special sealing
compounds. Moreover, they feature housings made of stainless steel and cable glands for low-temperature ranges.
When there is a built-in transmitter and/or a digital display, the special conditions from the
type examination certificate (see item 17) apply.
For applications requiring instruments of equipment Group II (potentially explosive dust
atmospheres), the following surface temperatures and ambient temperature ranges apply:
Table 2
Zone Medium Marking
1 Dust II 2D Ex ia IIIC T3 ... T6 Db
1 Mounting to zone 0 Dust II 1/2D Ex ia IIIC T3 ... T6 Da/Db
0 Dust II 1D Ex ia IIIC T3 ... T6 Da
Temperature
class
Ambient temperature
range (Ta)
Max. surface temperature (T
max
) at the
sensor or thermowell tip
750 mW (-50) 1) -40 ... +40 °C T
M
(medium temperature) + self-heating
For this, the special conditions (17) must be observed.
650 mW (-50) 1) -40 ... +70 °C
550 mW (-50) 1) -40 ... +100 °C
1) The values in brackets apply to special designs. These sensors are manufactured using special sealing
compounds. Moreover, they feature housings made of stainless steel and cable glands for low-temperature ranges.
When there is a built-in transmitter and/or a digital display, the special conditions from the
type examination certificate (see item 17) apply.