Connecting The Sensor; Connecting The Device - Endress+Hauser iTEMP HART TMT162 Bedienungsanleitung

Wiring
ESD – Electrostatic discharge
Protect the terminals against electrostatic discharge. Failure to comply with this instruction can
result in the destruction of parts of the electronics.
3.2

Connecting the sensor

!
Note!
The following connection options are possible for two sensor inputs:
Sensor 2:
RTD 2-wire
Sensor 2:
RTD 3-wire
Sensor 2:
RTD 4-wire
Sensor 2:
TC connection
"
Caution!
When connecting 2 sensors ensure that there is no galvanic connection between the sensors
(e.g. caused by sensor elements that are not isolated from the thermowell). 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.
3.3

Connecting the device

Fieldbus cable specifications to IEC 61158-2 (MBP), for details, see Operating Instructions (on
CD-ROM).
"
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, we
recommended grounding it via one of the ground screws.
3.3.1 HART
!
Note!
®
If the HART
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".
24
Sensor 1:
RTD 2-wire
YES
YES
NO
YES
®
connection
communication resistance is not built into the power supply, a 250 Ω
Sensor 1: Sensor 1:
RTD 3-wire RTD 4-wire
YES
YES
NO
YES
TMT162 HART
Sensor 1:
TC connection
NO YES
NO YES
NO NO
YES YES
Endress+Hauser
®