Examples Of Shielding / Grounding - ABB TTF200 Operating Instruction

18 TTF200 FIELD-MOUNT TEMPERATURE TRANSMITTER | OI/TTF200-EN REV. A
6.3.5

Examples of shielding / grounding

Insulated sensor measuring inset (thermocouple, mV, RTD, ohms), transmitter housing grounded
The shielding of the sensor connection cable is grounded via the grounded transmitter housing. This shielding is insulated
from the sensor.
The shielding of the power supply cable is grounded at the supply isolator / DCS input directly. This shielding is insulated
from the transmitter housing.
The shielding of the power supply cable and the shielding of sensor connection cable must not be connected to one
another. Make sure that the shielding is not connected to ground anywhere else.
1
Fig. 16: The shielding of the sensor connection cable and the shielding of the power supply cable are separate and each grounded at one
end
1 Temperature sensor 2 Shielding to the sensor insulated 3 Sensor connection cable 4 Shielding over transmitter housing
grounded 5 Transmitter housing grounded 6 Shielding of transmitter housing insulated 7 Supply voltage cable 8 Grounding
point 9 Supply isolator / Distributed Control System (DCS) DCS-entry
Insulated sensor measuring inset (thermocouple, mV, RTD, ohms), transmitter housing grounded
The shielding of the sensor connection cable is grounded via the grounded sensor housing. This shielding of the power
supply cable is insulated from the transmitter housing.
The shielding of the power supply cable is grounded at the supply isolator / DCS input directly. This shielding is insulated
from the transmitter housing.
The shielding of the power supply cable and the shielding of sensor connection cable must not be connected to one
another. Make sure that the shielding is not connected to ground anywhere else.
1
8
Fig. 17: The shielding of the sensor connection cable and the shielding of the power supply cable are separate and each grounded at one
end
1 Temperature sensor 2 Shielding over the sensor insulated 3 Sensor connection cable 4 Shielding of transmitter housing
insulated 5 Transmitter housing grounded 6 Shielding of transmitter housing insulated 7 Supply voltage cable 8 Grounding
point 9 Supply isolator / DCS-entry
8
2 3 4
8
2 3 4
5
6 7
8
5
6 7
8
9
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