Electrical Connection Values - WIKA TR Serie Instructions Complémentaires

3. Commissioning, operation

3.2.1 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
of standard measuring inserts in
accordance with DIN 43735
Effective internal inductance L
of standard measuring inserts in
accordance with DIN 43735
1) 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.
2) Current per IEC 60079-11 table 4
3) 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".
4) The permissible power to the sensor depends on the temperature of the medium T
temperature and the thermal resistance R
"Ex marking".
5) The internal inductance (L
connecting to an intrinsically-safe voltage supply.
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.
WIKA additional information, models TRxx and TCxx (Ex i)
Instrument group II
Potentially explosive
gas atmosphere
DC 30 V
550 mA
1.5 W
Negligible
i
Negligible
i
, but shall not be more than the values from "table 2" (column 2), chapter 1
th
= 1 µH/m) and capacitance (C
i
Potentially explosive dust
atmosphere
1)
DC 30 V
250 mA
For values, see "table 2" (column 2),
3)
chapter 1 "Ex marking"
Negligible
5)
Negligible
5)
M
M
= 200 pF/m) for cable probes must be taken into account when
i
2)
4)
5)
5)
, the temperature class and the thermal
, the maximum allowed surface
EN
9