Electrical Connection Values - WIKA RTD Zusatzinformation

3. Commissioning, operation

3.2.1 Electrical connection values

Electrical data without built-in transmitter or digital display
■
Parameters
EN
Voltage U
i
Current l
i
Power P (at the sensor)
i
Effective internal capacitance C
of standard measuring inserts in
accordance with DIN 43735
Effective internal inductance L
of standard measuring inserts in
accordance with DIN 43735
The internal inductance (L
label and they should be taken into account when connecting to an intrinsically safe
voltage supply.
1) Current per IEC 60079-11 table 4
2) 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 sensor/thermowell tip".
3) The permissible power to the sensor depends on the temperature of the medium T
temperature and the thermal resistance R
marking".
4) 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
Electrical data with built-in transmitter in accordance with the FISCO model
■
The transmitters/digital displays used for the application range in accordance with the
FISCO model are considered FISCO field instruments. The requirements in accordance
with IEC/EN 60079-27, and the connection conditions of the approvals in accordance
with FISCO, apply.
10
Instrument group II
Potentially explosive
gas atmosphere
DC 30 V
550 mA
1.5 W
2)
Negligible
i
Negligible
i
) and capacitance (C
i
, but shall not be more than the values from "table 2" (column 2), chapter 1 "Ex
th
WIKA additional information RTD and TC, intrinsically safe designs (Ex i)
Potentially explosive dust
atmosphere
4)
DC 30 V
250 mA
1)
For values, see "table 2" (column 2),
chapter 1 "Ex marking"
Negligible
Negligible
) for cable probes are found on the product
i
, the temperature class and the thermal
M
, the maximum allowed surface
M
3)