TMT162 Wiring
Endress+Hauser 11
4.2 Connecting the sensor
!
Note!
For sensor connection terminal layout please see Fig. 5. On two sensor inputs the following
connection combinations are possible:
There are special cable entries available as accessories when connecting 2 sensors (not for XP
instrumentation). These can be found in chapter 9.4.
"
Caution!
When connecting 2 sensors ensure that there is no galvanic connection between the sensors (e.g.
grounded duplex thermocouples). The resulting equalizing currents distort the measurements
considerably. In this situation, the sensors have to be galvanically isolated from one another by
connecting each sensor separately to a field transmitter. The device provides sufficient galvanic
isolation (> 2 kV AC) between the input and output.
4.3 Connecting the measuring unit
"
Caution!
• Switch off power supply before installing or connecting the device. Failure to observe this may
result in destruction of parts of the electronics.
• If the device has not been grounded as a result of the housing being installed, grounding it via one
of the ground screws is recommended.
4.3.1 HART
®
connection
!
Note!
If the HART
®
communication resistance is not built into the power supply, a 250 Ω communication
resistor must be fitted into the 2-wire supply lines.
For connection hints, please take special notice of the documentation supplied by the HART
®
Communication Foundation, specifically HCF LIT 20: “HART, a technical overview”.
Sensor 1:
RTD 2-wire
Sensor 1:
RTD 3-wire
Sensor 1:
RTD 4-wire
Sensor 1:
TC connection
Sensor 2:
RTD 2-wire
Yes Yes No Yes
Sensor 2:
RTD 3-wire
Yes Yes No Yes
Sensor 2:
RTD 4-wire
No No No No
Sensor 2:
TC connection
Yes Yes Yes Yes
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