Installation & Start-Up | 3-13
Figure 3.12.
4-20 mA Output Wiring
Notes: Analyzer power must be removed when connecting or disconnecting the 4-20 mA
signal.
Power and Ground Cable Type/Gauges: SVT/16-18 AWG (1.5 sq. mm - 1.0 sq. mm)
Signal Cable Gauges: 18, 20, and 22 AQG (1.0 sq. mm - 0.5 sq. mm)
1. Cable should be shielded with single twisted pair.
2. Cable shields should be connected to both the analyzer and the DCS. If this is not possible,
cable shields should be tied to the chassis at each 3050 analyzer. If this is not possible,
tie the shield at the PC or DCS to chassis and remaining shield to the chassis through a
0.1mF @ 500V capacitor.
3. The 3050 analyzer signal common is connected to earth ground. If the analog output is
also grounded, the analog output will no longer be electrically isolated. Contact AMETEK
if this situation occurs.
The 4-20 mA loop circuit must have a load resistance of between 100 and 500 ohms or
malfunction may occur. If a loop check is performed, the resistor must be place in series
with the ohmmeter
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