Dwyer UXF3 - Manual (Page 129)

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Startup of signals is not good
Cause of poor startup signals
(1) Incorrect detector mounting, dimensions (sensor mounting dimension, outer diameter, etc) and detector mounting
angle
Ÿ Mount the detector properly.
(2) Interference from acoustic wave. This may occur when the outer diameter programmed to be larger than actual size.
Ÿ Set the fluid type to "Other" and set the velocity (SV) to 20 to 50m/s (about 60 to 175 ft/s) lower than the current
setting, and remount the detector again. Note) For water, the velocity (SV) is approximately 1400m/s (4593 ft/s).
b) Noise on the one side
Dedicated cable on the one side is abnormal. Measure the insulation resistance.
Polarity of connected terminals is inverted. Check the connection
Sensor on the one side is abnormal. Peel off the detector and check the sensitivity
Detector bonding surface is peeling. Peel off the detector and temporarily place it by
grease, etc.
Dedicated cable is disconnecting. Check the continuity.
Poor contact. Check the detector surface and coupling compound
Trigger
The same wave height
forms near the trigger
level.
Startup of signals is not good
There is not a large difference
among triggering waveform.
Trigger
Waveform with noise on the one side
CH1 : 500mV/div
CH2 : 5V/div
Displacement from the
center of the pipe.
(in case of Z method) Displacement of the
mounting dimension Displacement from the
pipe axis.
Bulletin F-107-UXF3