Dakota Ultrasonics UMX-2 User Manual
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CHAPTER EIGHT
ADDITIONAL FEATURES & OPTIONS
8.1 Power Off
The UMX-2 will power off automatically after approximately 4 minutes without
receiving an echo (measurement). It should be noted that if the transducer face is
not wiped clean, there’s a chance an echo can continuously be detected. If that
happens, the gauge will remain on until the battery life is exhausted. As a result, the
UMX-2 can also be powered down manually as follows:
Manual Power Off
1) Press and hold the single UMX-2 button, located on the top end cap. Once
the UMX-2 is approaching power off status, “POWER”…”OFF”, will be
displayed in a loop on the alpha display, and the UMX-2 will shut down.
This takes approximately 10 seconds. Once the gauge is off, the button can
be released.
8.2 Gain
The gain feature will only be displayed as a menu option if a ‘dual element’ style
transducer has been connected, and the UMX-2 is in either ‘pulse-echo (P-E) or
‘pulse-echo coating (PECT)’ modes. Multiple echo modes, which include both single
and dual style probes, are equipped with ‘automatic gain control (AGC) that optimizes
the gain setting automatically in the hardware of the UMX-2..
Gain, or amplification of the return echoes, can be adjusted in the UMX-2 to
accommodate a variety of applications. The setting of the gain is crucial in order to
obtain valid readings during the measurement process. Too much gain may result in
erroneous measurements, by detecting on noise rather than the actual material back
wall itself. Not enough gain may result in intermittent detection. It may also result in
lack of detection on internal flaws, pits, or porosity. The gain can easily be compared
to the volume control of a home stereo system. If you turn it up too much, you can’t
hear the music clearly. If it’s turned down too much, you can’t hear it at all.
The UMX-2 has three gain settings (VLOW, LOW, MED, HI, VHI). The gain range is
42dB – 50dB in 2dB increments. Note: The UMX-2 has been optimized for the MED
gain setting for all common applications. It should be operated in this mode as
standard. However, some applications may require the lower or higher gain settings.