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DT9100 I4
Select the connection
cable
EMC considerations
20180905-V1
5. Connecting
5.1. Preparing the connection
Always observe the following safety instructions:
•
When you are going to install instruments in a hazardous
area, or install instruments which are connected to
instruments working in a hazardous area, you should take
note of the appropriate regulations, and conformity and type
approval certificates of the DT9100 I4 and the other
instruments (e.g. isolator, Zener barrier).
•
The connection must be carried out by trained and
authorized personnel.
•
In particular, make sure that no potential equalization
currents flows over the cable screen. Ground only one side
the cable screen.
•
Use only a screwdriver with appropriate head.
•
Do not touch the wire ends to each other.
Use two wire twisted pair screened cable.
The wire cross-section should be 0.25–1.5 mm
You may use either solid conductor or flexible conductor.
In the case of using flexible conductor, use crimped wire
end.
When select the cable, consider the Ex installation
regulations.
In installation must be ensured, that no potential
equalization currents flows over the cable screen.
Ground only one side the cable screen (it's recommended
the transmitter side). If necessary of grounding on both
sides (for suppress very high level, high fequency
interference signals) this can be achieved by use separate
potential equalization or by use of a blocking capacitor (e.g.
ceramic capacitor 1 nF, 1500 V) or. The low frequency
potential equalization currents are thus suppressed, but the
protective effect against high frequency interference signals
remains.
Choosing the value of the capacitor should take consider
the Ex installation regulations.
2
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