PART FOUR - SERVICE AND MAINTENANCE
SECTION 3 - TROUBLESHOOTING
Rev. 7-1201
Model P63 pH Analyzer
103
Finding Source
of Ground Loop
☞
3.2 Isolating Measuring
System Problem
Checking
Electrical Connections
Verifying
Sensor Operation
Verifying
Analyzer Operation
Sometimes the source of a ground loop is easy to find, but it
usually takes an organized approach to isolate the problem.
Troubleshooting Tip!
Use a systematic troubleshooting
method. If possible, start by grounding all shields and
electrical grounds at one stable point. One at a time, turn
off all pumps, motors and switches that are in contact
with the process. Each time you do this, check if the
ground loop still exists. Since the process media being
measured is electrically conductive, the source of the
ground loop may not be readily apparent.
When experiencing problems, try to determine the primary
measurement system component causing the problem (sen-
sor, analyzer, or interconnect cable if used). Use the
analyzer’s system diagnostic capabilities to help you isolate
the problem (see PART THREE, Section 7). Additionally,
perform these simple checks:
1. Verify that line power exists at the analyzer’s MAINS
terminals (TB5 and TB6).
2. Check the analyzer’s ribbon cable and make sure its
mating connectors are properly connected.
To verify sensor operation, refer to the procedure in the
troubleshooting section of the sensor operating manual.
WARNING:
DISCONNECT LINE POWER TO AVOID THE POSSI-
BILITY OF ELECTRICAL SHOCK.
1.
After disconnecting line power from the analyzer, dis-
connect the pH sensor.
2.
Depending on the type of pH sensor, refer to the ap-
propriate category below and follow the steps to
simulate the pH and temperature input signals:
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