Troubleshooting Cha
ter Ei
ht: Maintenance and Troubleshootin
130
Troubleshooting
This section describes the most common problems encountered with the 670 instrument and
offers possible solutions.
Note
If possible, substitute another similar instrument to verify that the
problem involves the 670 instrument
before
proceeding.
Noisy Pressure Reading
•
Verify that all cable connections on the 670 instrument are screwed in securely.
•
Check the pressure system to ensure that all connections are tight.
•
Isolate any mechanical vibration from the pressure transducer with bellows.
•
Use the averaging feature to average multiple pressure readings.
Refer to
Averaging,
page 51, for discussion of the averaging feature.
•
Use cables designed for high EMI environments.
Trip Point Relays Change State Erratically
•
Verify that all connections are tight.
•
Verify that the High and Low values are entered correctly for each trip point.
Refer to
How To Configure the Trip Points,
page 75, for more information.
•
Check the hysteresis value.
Refer to
How To Adjust Hysteresis,
page 78, for an explanation of the hysteresis entries.
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