Testing The Coaxial Cable (Remote Systems) - Ametek Drexelbrook Z-tron Level Control 502-302X Series Installation And Operating Instructions Manual

502-302 Series Z-tron
X
5.3 Testing the
Coaxial Cable
(Remote-mounted
Systems only)
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TM Level Control
Troubleshoot the coaxial cable in a remote-mounted system
using the following procedure.
If there is water or other conductive material
in the conduit, it could cause the instrument
to fail. If this is the case, it may not be detected
by the following test.
a. Disconnect all three wires at the electronic unit (center,
shield, and ground). Disconnect all three wires at the
sensing element condulet.
b. Measure resistance from center wire to cote-shield
using an analog ohmeter set to R x 10K scale.
Resistance should be infinity (open circuit).
c. Short sensing element and cote-shield terminals
together at one end.
d. Measure resistance from probe to cote-shield terminals
at other end. Resistance should be near zero ohms
(short circuit).
e. Repeat steps b, c, and d for cote-shield and ground
wires.
f. Repeat steps b, c, and d for cote-shield and ground
wires.
25
Troubleshooting
NOTE