Examples Of Shielding / Grounding - ABB TTF200 Operating Instructions Manual

TTF200 FIELD-MOUNT TEMPERATURE TRANSMITTER | OI/TTF200-EN REV. B

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
1 Temperature sensor
2 Shielding insulated from sensor
3 Sensor connection cable
4 Shielding grounded via transmitter housing
5 Transmitter housing, grounded
Figure 16: The shieldings of the sensor connection cable and the supply voltage cable are separate and each grounded at one end
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
1 Temperature sensor
2 Shielding grounded via sensor
3 Sensor connection cable
4 Shielding insulated from transmitter housing
5 Transmitter housing, grounded
Figure 17: The shieldings of the sensor connection cable and the supply voltage cable are separate and each grounded at one end
8
2 3 4
8
2 3 4
8
5
6 7
8
6 Shielding insulated from transmitter housing
7 Supply voltage cable
8 Grounding point
9 Supply isolator / DCS input
5
6 7
8
6 Shielding insulated from transmitter housing
7 Supply voltage cable
8 Grounding point
9 Supply isolator / DCS input
9
A10273
9
A10274
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