WIKA TR10-A - Handbuch (Seite 31)

WIKA operating instructions RTD and TC, intrinsically safe designs (Ex i)
3345267.12 01/2014 GB/D
31
GB
Sensor circuit in Ex ia or ib, IIC intrinsic safety ignition protection
Only for connection to intrinsically safe circuits with the following maximum output values for
Group II instruments (potentially explosive gas atmospheres):
U
o
= DC 30 V
I
o
= 550 mA
P
o
= 1.5 W
For Group II instruments (potentially explosive dust atmospheres), the following maximum output
values apply to their connection to intrinsically safe circuits:
U
o
= DC 30 V
I
o
= 550 mA
P
o
= For the values, see “Table 2” (column 2), chapter 7.1.2 “Ex marking”
8.2 Electrical data for built-in transmitters or digital displays
For the sensor circuit, the values mentioned in 8.1 apply.
Signal circuit in Ex ia or ib, IIC intrinsic safety ignition protection
U
i
= depending on the transmitter/digital display
I
i
= depending on the transmitter/digital display
P
i
= in the housing: depending on the transmitter/digital display
C
i
= depending on the transmitter/digital display
L
i
= depending on the transmitter/digital display
The transmitters and digital displays used must have their own certification in accordance
with EN/IEC. The installation conditions and electrical connection values can be seen from the
relevant approvals and must be observed.
8.3 Electrical data with built-in transmitters 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 units. The requirements in accordance with EN/IEC 60079-27,
and the connection conditions of the approvals in accordance with FISCO, apply.
8.4 TC95/TR95 multipoint thermocouples
Assembly of multipoint thermocouples from individual sheathed cables
For the individual insulated sheathed cable, the values mentioned in 8.1 apply. For operationally
grounded multipoint thermocouples, the sum of all the sensors must comply with the above-
mentioned values. For applications in dust areas, the values from “Table 2” (column 2) given in
chapter 7.1.2 “Ex marking” must be observed.
8. Electrical connection values