Chapter 5. Error Codes and Troubleshooting
90 AquaTrans™ AT600 User’s Manual
5.1.2.1 E1: Low Signal
Problem: Poor ultrasonic signal strength or the signal exceeds the programmed limit.
Cause: When the SNR is less that the value of Signal Low Limit or the signal cannot be found when the
flow is started, the
Low Signal error is displayed. Poor signal strength may be caused by a
defective cable, a flowcell problem, a defective transducer or a problem in the electronics console.
A signal that exceeds the programmed limits is probably caused by the entry of an improper
value in the menu
Program > Advanced > Error Limits > Signal Low limits.
Action: Refer to “Diagnostics” on page 93. Also, check the programmed value in the Program > Advanced >
Error Limits> Signal Low Limit
menu.
5.1.2.2 E2: Sound Speed Error
Problem: The sound speed exceeds the limit programmed in the Program > Advanced > Error Limits>
SNSD+- Limit
menu
Cause: When the measured sound speed exceeds the programmed sound speed limit, this error is
displayed. The error may result from incorrect programming, poor flow conditions, and/or poor
transducer orientation.
Action: Correct the programming errors. Refer to “Diagnostics” on page 93, to correct the flowcell and/or
transducer problems. Also, check the value programmed in the
Program > Advanced > Error Limits
> SNSD +- Limit
menu.
5.1.2.3 E3: Velocity Range
Problem: The velocity exceeds the limits programmed in the Program > Advanced > Error Limits
> Velocity Low/High
menu.
Cause: When the measured velocity exceeds the programmed velocity limit, this error is displayed. The
error may be caused by improper programming, poor flow conditions, and/or excessive flow
turbulence.
Action: Make sure the actual flow rate is within the programmed limits. Also, check the value
programmed in the
Program > Advanced > Error Limits > Velocity Low/High menu. Refer to
“Diagnostics” on page 93, to correct the flowcell and/or transducer problems.
5.1.2.4 E4: Signal Quality
Problem: The signal quality is outside the limits programmed in the Program > Advanced > Error Limits
> Correlation Peak
menu.
Cause: The peak of the upstream or downstream correlation signals has fallen below the correlation
peak limit programmed in the
Program > Advanced > Error Limits > Correlation Peak menu. This may
be caused by a flowcell or electrical problem.
PeakPctUp Displays the percentage of peak of the upstream signal NA NA
PeakPctDn Displays the percentage of peak of the downstream signal NA NA
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