Dakota Ultrasonics PX-7 DL - Manual (Page 21)

PX-7 DL Ultrasonic Thickness Gauge
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In normal operation, the PX-7 DL performs and displays four
measurements every second, which is quite adequate for single
measurements. In Scan Mode, however, the tool performs eight
measurements every second, but does not display them. While the
transducer is in contact with the material being measured, the PX-7 DL is
keeping track of the lowest measurement it finds. The transducer may be
"scrubbed" across a surface, and any brief interruptions in the signal will be
ignored. When the transducer loses contact with the surface for more than
a second, the PX-7 DL will display the smallest measurement it found.
When the PX-7 DL is in measurement mode, press the MODE key to
activate the features and settings. The display will begin flashing ALAr
(alarm), followed by the status - on/off. Use the UP and DOWN arrow keys
to scroll to SCAn mode. Press the SEND key to toggle scan mode on/off.
While scanning, the display will show a moving series of dashes instead of
a thickness value. When the transducer is removed from the material
being scanned, the PX-7 DL will (after a brief pause) display the smallest
measurement it found.
Alarm Mode
The Alarm Mode feature of the PX-7 DL allows the user to set an
audible and visual parameter when taking measurements. If the
measurement falls below a nominal value, set by the user, a red light will
be illuminated on the front panel of the gauge and the beeper sounded.
This improves the speed and efficiency of the inspection process by
eliminating constant viewing of the actual reading displayed. The following
procedures outline how to enable and set up this feature: