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10
5. TROUBLESHOOTING
Consult the following list of problems and possible solutions should difficulties arise.
Consult the factory for additional troubleshooting help.
Symptom: Displacement Transducer Readings are Unstable
Is the readout box position set correctly? If using a datalogger to record readings
automatically are the swept frequency excitation settings correct? Try reading the
displacement transducer on a different readout position. For instance, channel A of the
readout box might be able to read the transducer. To convert the Channel A period
display to digits use Equation 1.
Is there a source of electrical noise nearby? Most probable sources of electrical noise
are motors, generators, transformers, arc welders and antennas. Make sure the shield
drain wire is connected to ground whether using a portable readout or datalogger. If
using the GK-401 Readout connect the clip with the green boot to the bare shield drain
wire of the pressure cell cable. If using the GK-403, GK-404 or GK-405 readout box
connect the clip with the blue boot to the shield drain wire.
Does the readout work with another displacement transducer? If not, the readout may
have a low battery or be malfunctioning. Consult the appropriate readout manual for
charging or troubleshooting directions.
Has the transducer gone outside its range? If so, the transducer can be reset using the
installation instructions in section 2.
Symptom: Displacement Transducer Fails to Read
Is the cable cut or crushed? This can be checked with an ohmmeter. Nominal
resistance between the two gage leads (usually red and black leads) is 180, 10.
Remember to add cable resistance when checking (22 AWG stranded copper leads are
approximately 14.7/1000' or 48.5/km, multiply by 2 for both directions). If the
resistance reads infinite, or very high (megohms), a cut wire must be suspected. If the
resistance reads very low (100) a short in the cable is likely.
Does the readout or datalogger work with another transducer? If not, the readout or
datalogger may be malfunctioning. Consult the readout or datalogger manual for further
direction.
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