Ground The Transmitter; Operation; Communication; Hart Communicator Dxr 275/375 - Endress+Hauser TMT122 Operating Instructions Manual

5 Operation

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14
4.4

Ground the Transmitter

The transmitter will operate with the current signal loop either floating or grounded. However, the
extra noise in floating systems affects many types of readout devices. If the signal appears noisy or
erratic, grounding the current signal loop at a single point may solve the problem. The best place to
ground the loop is at the negative terminal of the power supply. Do not ground the current signal
loop at more than one point. The transmitter is galvanically isolated to 2 kV AC (from the sensor
input to the output), so the input circuit may also be grounded at any single point. When using a
grounded thermocouple, the grounded junction serves as this point.
5 Operation
5.1

Communication

The temperature DIN rail transmitter is set up using the HART
measured can also be read using the HART
lities:
• Operation using a universal hand operated module "HART
• Operation using a PC and operating software (e.g. Commuwin II) as well as a HART
(e.g. "Commubox FXA 191").
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5.1.1 HART Communicator DXR 275/375
Selection of the unit functions using the "HART
levels as well as with the help of a special HART
Note!
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• When using the HART
programming is locked. It is possible to access the HART
LOCK function. This condition remains even after a power failure. The HART
can be locked again by entering the personal code number.
• More detailed information on the HART
operating manual in the carrying case.
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protocol. In order to do this the user has two possibi-
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Communicator" is done using various menu
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function matrix (see page 18).
hand unit all parameters can be read out, however,
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hand operation module can be found in the respective
Temperature DIN rail transmitter
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protocol. The values
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Communicator DXR 275/375".
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function matrix by entering 281 in the
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function matrix
Endress+Hauser
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modem