Datcon DT9100 B, Operating Instructions Manual

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DT9100 B
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 B 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
current 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 of the battery pack to each
other.
Select the connection
cable Use two wire twisted pair screened cable.
The wire cross-section should be 0.25–1.5 mm
2 .
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.
EMC considerations 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.
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