Checkline DFX-7 - Manual (Page 5)

CHAPTER ONE
INTRODUCTION
The Dakota Ultrasonics model DFX-7 is both, an ultrasonic thickness gauge, as well
as a flaw detector. Since the DFX-7 is basically two gauges in a single package, we
split the manual into two manuals, one for each gauge type. This manual will focus
only on the thickness gauge portion of the gauge. The DFX-7 has the ability to
simultaneously measure coatings and material thicknesses while maintaining the
ability to locate pits, flaws and defects in the material. Based on the same operating
principles as SONAR, the DFX-7 is capable of measuring the thickness of various
materials with accuracy as high as
± 0.001 inches, or ± 0.01 millimeters. The
principle advantage of ultrasonic measurement over traditional methods is that
ultrasonic measurements can be performed with access to only one side of the
material being measured.
Dakota Ultrasonics maintains a customer support resource in order to assist users
with questions or difficulties not covered in this manual. Customer support may be
reached at any of the following:
Dakota Ultrasonics Corporation
1500 Green Hills Road, #107
Scotts Valley, CA 95066 USA
Telephone: (831) 431-9722
Facsimile: (831) 431-9723
www.dakotaultrasonics.com
1.1 General Disclaimer
The manual should be read and understood prior to using the DFX-7. This operating
manual provides the user with all the general information necessary to use and adjust
the designed features. However, this manual is not a certified NDT training course,
nor is it intended to be one. Training, according to company requirements, is
recommended.
Inherent in ultrasonic thickness measurement is the possibility that the instrument will
use the second rather than the first echo from the back surface of the material being
measured. This may result in a thickness reading that is TWICE what it should be.
Responsibility for proper use of the instrument and recognition of this phenomenon
rest solely with the user of the instrument. Other errors may occur from measuring
coated materials where the coating is insufficiently bonded to the material surface.
Irregular and inaccurate readings may result. Again, the user is responsible for
proper use and interpretation of the measurements acquired.