Electrical Connection Values - WIKA TR12 Serie Manual De Instrucciones

3. Commissioning, operation

Electrical connection values

Variant 1
■
U = DC 30 V
max
EN
Use in methane atmospheres
Owing to the higher minimum ignition energy of methane, the instruments can also be
used where methane causes a potentially explosive gas atmosphere.
Variant 2
■
U = DC 30 V
max
P = 2 W
max
Variant 3
■
U = depending on the transmitter/digital display
max
P = in the case: depending on the transmitter/digital display
max
3.6 Temperature class classification, ambient temperatures
The permissible ambient temperatures depend on the temperature class, the cases used
and the optional built-in transmitter and/or digital display.
When a thermometer is connected to a transmitter and/or a digital display, the lowest value
of either the ambient temperature limits or the highest temperature class will apply. The
lower temperature limit is -40 °C; and -50 °C for special designs.
Where there are neither transmitters nor digital displays mounted within the case, there will
also be no additional warming. With a built-in transmitter (optionally with digital display),
heating caused by operating the transmitter or digital display may occur.
For applications without transmitters (digital displays) requiring instruments of equipment
group II (potentially explosive gas atmospheres), the following temperature class
classification and ambient temperature ranges apply:
Temperature class
T1 ... T6
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.
The permissible ambient temperatures and surface temperatures for third-party products
can be seen from the relevant approvals and/or data sheets and must be observed.
14
Ambient temperature range (T
(-50) -40 ... +80 °C
1)
WIKA additional information TR12/TC12, flameproof enclosure (Ex d)
)
a