Potential Grounding - Endress+Hauser TMT122 Operating Instructions Manual

Temperature DIN rail transmitter
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Endress+Hauser
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Connection of a HART
fig. 6: Electrical connection of the HART
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a = HART module, a* = HART
supply, b = Loop power supply (e.g. RNS 221 power supply or RN 221N active barrier), c = HART
directly to the transmitter, d = PLC with passive input
Connection of Commubox FXA 191
Note!
Set the Commubox DIP switch to 'HART
fig. 7: Electrical connection of the Commubox FXA 191
a = Commubox FXA 191 (in combination with a PC - E+H operating software 'Commuwin II'),
a* = Commubox FXA 191 connected to the communication sockets of a power supply unit,
b = Loop power supply (e.g. RNS 221 power supply or RN 221N active barrier), c = Commubox FXA 191 connected di-
rectly to the transmitter, d = PLC with a passive input
4.3

Potential grounding

Note!
Please take note of the following when installing the transmitter. The shield on the 4 to 20 mA signal
output must have the same potential as the shield at the sensor connections.
In plants with strong electromagnetic fields, shielding of all cables with a low ohm connection to
ground is recommended.
It is recommended that shielded cable be used in installations outside buildings, due to the danger
of lightning strikes.
hand operated module DXR 275/375
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operated module
module connected to the communication sockets of a power
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4 Wiring
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module connected
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