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RTX 1000H series user manual
Wire selection (Table 3-1)
To get the best EMC performance, use shielded twisted pair cable for the field
wiring.
•
Select a wire gauge for the required total length so the transmitter
operates within the load requirements.
•
When using external power supplies, make sure the connection polarity
allows current to flow into the +ve terminal and out of the -ve terminal.
Refer to Figure 3-7.
AWG
Inches
16
0.0508
18
0.0403
20
0.0320
22
0.0254
24
0.0201
Note: The typical values for resistance per length are doubled as the
circuit is a direct current loop.
Electrical conduit (Figure 3-6)
Use electrical conduit in accordance with local wiring codes. The electronics
housing has two threaded holes for electrical conduit connections. The
configuration in Figure 3-6 prevents moisture getting into the housing. If conduit
is not used, use the correct cable gland/plugs to seal the housing.
K0297 Issue 2
Table 3-1: Wire resistance
Wire Diameter
mm
1.291
1.024
0.812
0.644
0.511
Ohms/Foot
0.0082
0.0128
0.0204
0.0322
0.0514
3-8
Loop Resistance
Ohms/Meter
0.0264
0.0418
0.0666
0.1060
0.1680
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