Dwyer UXF2 - Manual (Page 108)

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ESC
Obtain a measurement-mode display using the
ESC and the keys.
0.000 m/s
0.000 m3/h
5.7.1.2. Checking the LED lit in red
Check the LED lit in red, following the procedure shown below.
LED lit in red
Check the AGC_U and AGC_D
values.
The value appears as
8484.
Check P/H_U and P/H_D.
The value fluctuates.
The value is kept
stable between 395
and 415.
Check T1 and T2.
Both AGC_U and AGC_D
1
ɦ Check AGC_U, AGC_D, P/H_U, P/H_D, T1 and T2, following the procedure in “5.7.1.3
Displaying the data in maintenance mode.”
Error status : No waves are received.
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 “5.7.6 Remedying a hardware fault .”
Error status : No waves are received.
Cause and remedy :
Transmitter circuit failure (one-side receiving circuit failure)
Ÿ See “5.7.6 Remedying a hardware fault .”
Either AGC_U or AGC_D
Error status : Received waves fluctuate.
Cause and remedy :
Mixing in of air bubbles
Ÿ Stop the flow, and if the measurement is found to be normal,
there is great possibility that air bubbles are entrained. 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.
1
Error status : Noise
Cause and remedy :
Ÿ Check ultrasonic signals for existence of noise using an
oscilloscope. Remove noise if found by performing
grounding, etc.
Error status : Operation error
Cause and remedy :
CPU operation error
Ÿ Reset the power (OFFoON)
If the power is not restored, see “5.7.6
Remedying
a hardware fault .”
T1 and T2 fluctuate
or differ significantly
from each other.
YES
YES
NO
YES
NO
YES
NO
YES
NO
NO
BULLETIN F-70