Electrical Connection Values - WIKA TR12 Serie Manual De Instrucciones

3. Commissioning, operation
3.2 Electrical mounting
Using a transmitter/digital display (option):
Observe the contents of the operating instructions for the transmitter/digital display (see
scope of delivery).
EN
Built-in transmitters/digital displays have their own EC-type examination certificate. The
permissible ambient temperature ranges of built-in transmitters can be taken from the
corresponding transmitter approval.
Observe the special conditions (see chapter 4 "Special conditions for use (X conditions)",
point 3).

Electrical connection values

Electrical data without built-in transmitter or digital display
■
Parameters
Voltage U
i
Current l
i
Power P (at the sensor)
i
Effective internal capacitance, C
measuring inserts in accordance with DIN 43735
Effective internal inductance, L
measuring inserts in accordance with DIN 43735
1) The permissible power to the sensor depends on the temperature of the medium T
resistance R , but shall not be more than 1.5 W.
th
Calculation examples see chapter 5 "Calculation examples for self-heating at the thermowell tip".
2) The permissible power to the sensor depends on the temperature of the medium T
temperature and the thermal resistance R
"Ex marking".
3) 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.
Electrical data with built-in transmitter or digital display
■
U = depending on the transmitter/digital display
i
I = depending on the transmitter/digital display
i
P = in the case: depending on the transmitter/digital display
i
C = depending on the transmitter/digital display
i
L = depending on the transmitter/digital display
i
12
, of standard
i
, of standard
i
, but shall not be more than the values from "Table 2" (column 2), chapter 1
th
WIKA additional information TR12/TC12, intrinsically safe designs (Ex i)
Instrument group II
Potentially explosive gas atmosphere
DC 30 V
550 mA
1.5 W
1)
Negligible
Negligible
, the temperature class and the thermal
M
, the maximum allowed surface
M
3)