
IM-P198-02
MI Issue 5
23
4.1.1 Ground loops
Ground loops may interfere with signal transmission by superimposing unwanted signals
on the desired signals. This may be prevented by correctly connecting the cable shields.
Metal or plastic pipelines determine the shield to be used.
Metal pipelines are usually earth grounded. Thus, the cable shield should not be connected
at the flowmeter. The shield should be connected to a specific instrument earth ground at
the control panel.
Plastic pipelines require the transmitter condulet to be connected to an earth ground. To
do this, connect the condulet to the earth ground by attaching a cable or braid form the
earth ground to the external ground lug on the condulet. Alternatively, connect the signal
cable shields to the condulet via one of the terminal board mounting screws or J3 pin 19.
The flowmeter enclosure must be connected to the local earth ground by a 3.31 mm
2
(12 AWG) wire. Use the nut on the side of the condulet to make this ground connection
secure.
Fig. 18 Enclosure earth ground
Conn1
1 Conn3 9
Conn2
1 5
24
J3
12
1
13
Содержание RIM10 Series
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