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The NGC8206 must be properly grounded. The NGC has a grounding lug on the

mounting neck of the enclosure. This lug should be tied to a good earth ground

with no smaller than #12AWG wire. The NGC8206 cannot be connected to any

pipeline where cathodic protection exists. If the system uses cathodic protection,

the NGC must be mounted on a section of pipe that has been electrically isolated

from the cathodic currents (see Figure 1—16).

1.4.1 Power Supply

The power supply for the NGC should have an isolated output (i.e., the negative

side of the 12VDC output should not be electrically connected to chassis or earth

ground). In many instances, the power supply is collocated with a radio. If the

radio is connected to the NGC8206 via RS232/485/422, the communications

should share the power ground. The communication shield should only be

connected at the NGC end. The other end should be left to float (left

unconnected).

1.4.2 Sample Probe

If the sample probe is mounted to a section of pipe where cathodic currents may

exist, the user needs to put isolators in the sample tubing between the sample

probe and the NGC. Any time that the sample probe is on a section of pipe other

than the one where the NGC is directly mounted, tubing isolators should be

employed. It is very important that probe ground and the NGC ground be at the

same potential. If this cannot be insured, tubing isolators must be used.