ABB TTF200 Operating Instruction page 19

TTF200 FIELD-MOUNT TEMPERATURE TRANSMITTER | OI/TTF200-EN REV. A
Insulated sensor measuring inset (thermocouple, mV, RTD, ohms), transmitter housing not grounded
The shielding of the power supply cable and the shielding of the sensor connection cable are connected to one another via
the transmitter housing. The shielding is grounded at one end of the power supply cable, directly at the supply isolator /
DCS input. Make sure that the shielding is not connected to ground anywhere else.
1
Fig. 18: The shielding of the sensor connection cable and the shielding of the power supply cable are connected electrically via the
transmitter housing and grounded at one end
1 Temperature sensor 2 Shielding to the sensor insulated 3 Sensor connection cable 4 Shielding over transmitter housing
electrically connected 5 Transmitter housing not grounded 6 Power supply cable 7 Grounding point 8 Supply isolator /
DCS-entry
Non-insulated sensor measuring inset (thermocouple), transmitter housing grounded
The shielding of the sensor connection cable is grounded via the grounded sensor housing. This shielding 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 the sensor connection cable
must not be connected to one another. Make sure that the shielding is not connected to ground anywhere else.
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Fig. 19: 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 grounded 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
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