CHAPTER ONE
INTRODUCTION
The Dakota Ultrasonics model DFX-7 is both, an ultrasonic flaw detector, as well as
an ultrasonic A/B Scan thickness scope, in a single unit. It’s a combination of both
our CMX DL+, as well as our new DFX-7 flaw detector series. Why is this
advantageous? Thickness gauge are specifically setup to very accurately measure
thickness, locate pits, flaws and blind surface corrosion. All the linearity tables,
correction curves for various types of longitudinal transducers and features are built
with dimensional thickness as its primary focus. Flaw detectors are designed to
detect, size, position, and differentiate between flaw types in various materials and
welded joints. A flaw detector must be fast, in terms of its sample and screen refresh
rate, as inspectors are generally scanning the surface of a part or test specimen at a
relatively high speed, rather than looking for the thickness at a specific point or
location. While flaw detectors can also measure material thickness with reasonable
accuracy, they are not designed with precision thickness as their primary focus.
The DFX-7 combines the two types of gauges into one powerful and full featured
instrument, that’s equipped with a number of comprehensive toolkits to provide the
user the arsenal necessary to address a number of common field applications. In
and effort to avoid complexity issues and differential between gauges types, this
manual focuses only on the flaw detector portion of the DFX-7.
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
operate the features of the DFX-7. However, this manual is not a certified NDT
training course, nor is it intended to be one. Ultrasonic training for sound wave
theory, flaw detection and interpretation of defects is highly recommended, and will
be required by most companies and contract services. Contact the local NDT society
in your area to inquire about training available in your locality.
1.2 Electrical Warning
The DFX-7 contains a high voltage pulser. It’s recommended that the gauge be
powered off prior to connecting or disconnecting your transducer, to avoid damaging
the DFX-7.
