Dwyer UXF3 - Manual (Page 120)

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6.6.1.2. Checking the LED lit in red
Check the LED lit in red, following the procedure shown below.
1
Error status: Received wave is abnormal
o Received wave fluctuates, noise
Cause and remedy:
Bubbles or foreign objects included in the fluid
Ÿ Stop the flow, and if the measurement is found to be
normal, there is great possibility that air bubbles are
contained. Remove bubbles in such cases.
Noise
Ÿ Check ultrasonic signals for existence of noise using
an oscilloscope.
Remove noise if found by performing grounding, etc.
See “6.6.6.Checking received waveforms”.
LED lit in red
Check the RAS information
The 2nd or 3rd from
the left is 1.
0110000000000000
Check AGC_U, AGC_D.
The 7th from the left
is 1.
0000001000000000
The 4th or 5th from
the left is 1.
0001100000000000
Error status: No waves are received. Waves are being searched.
(Window scanning)
Cause and remedy:
Transmission error due to scale or rust within piping
Ÿ Move the mounting position of the detector.
Break of signal cable Ÿ Repair or replace the signal cable.
Detector mounting failure Ÿ Remount the detector.
Transmitter circuit failure or detector failure
Ÿ See “6.6.7. Remedying a hardware fault”
Error status: Device error, Ultrasonic send/receive signals cannot be
collected.
Cause and remedy:
Abnormality of measuring circuit
Ÿ Turn the power OFF then ON again.
If the instrument does not recover, transmitter circuit is failure.
Ÿ See “6.6.7. Remedying a hardware fault”.
Error status:
Signal error o Weak receiving waveform, Signal
configuration error
Signal range over o Signal position is abnormal.
Cause and remedy:
Detector mounting failure Ÿ Remount the detector.
Incorrect detector selection
Ÿ Change the setting for the detector selection, and
remount the detector.
Transmission error due to scale or rust within piping
Ÿ Move the mounting position of the detector.
Incorrect piping data input
Ÿ Enter the correct data, and remount the detector.
1
Error status: Malfunction
Cause and remedy:
LED failure Ÿ See “6.6.1.1.Checking the LCD/LED”
and “6.6.7.Remedying a hardware
fault”.
YES
1
The 6th from the left
is 1.
0000010000000000
Check P/H_U, P/H_D.
The 8th from the left
is 1.
0000000100000000
35% or less
1
The values fluctuate
or is outside the range
of 5528 to 6758.
Bulletin F-107-UXF3