Chapter 5. Error codes and troubleshooting
76
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 77. 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 77, 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 77, 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.
Action:
Check for sources of electrical interference and verify the integrity of the electronics console by
temporarily substituting a test flowcell that is known to be good. Check the transducers and relocate
them, if necessary. See “Diagnostics” on page 77, for instructions.
5.1.2.5
E5: Amplitude error
Problem:
The signal amplitude exceeds the limits programmed in the program > advanced > error limits amp disc
min/max menu.
Cause:
Solid or liquid particulates may be present in the flowcell. Also, poor coupling for the clamp-on
transducers can cause this problem.
Action:
Refer to “Diagnostics” on page 77, to correct any flowcell problems.
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