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DFX-7 Flaw Detector & Thickness Gauge

The Dakota Ultrasonics model DFX-7 is both a Ultrasonic flaw detector and an ultrasonic material and coating thickness gauge. The DFX-7 Flaw detectors are designed to detect, size, position, and differentiate between flaw types in various materials and welded joints. Fast & High performance, with a 200 volt square wave pulser that can be adjusted for specific applications and transducers offers greater penetration for difficult material types, or increased resolution on noisy materials.The DFX-7 is equipped with an adjustable pulse repetition rate of 8 to 333Hz to control how fast the pulser is firing. Therefore, when scanning at higher speeds, a higher repetition rate will make the alarm trigger more responsive. In addition, the DFX-7 serves the function of a thickness gauge are specifically setup to very accurately measure thickness, locate pits, flaws and blind surface corrosion and measure coating thickness.  

DFX 7 Flaw Detector Used for a wide variety of ultrasonic testing tasks such as flaw detection, thickness gauging, weld and bond testing, and more critical safety-related and quality-related applications involving structural welds, steel beams, forgings, pipelines and tanks, aircraft engines and frames, automobile frames, railroad rails, power turbines and other heavy machinery.

Product Specification
General Receiver  
Size: 2.5W x 6.5H x 1.24D in (63.5 x 165 x 1.5mm). Gain: 0 to 110dB with 0.2dB resolution. Manual
and AGC control.
Echo-Echo Mode (E-E) - (Thru Paint & Coatings)
range 0.050 to 4.0 inches (1.27 to 102 millimeters).
Weight: 14 ounces (.397kgs), with batteries. Damping: 50, 75, 100, 300,
600, & 1500 ohms.
Single Delay Line - 0.007 to 1.00 in (.178 to
25.4 mm). Single Contact - 0.040 in to 10 ft. (1
mm to 305 cm). Will vary based on coating.
Case: Extruded aluminum body with nickel
plated aluminum end caps (gasket sealed).
Frequency Bands: DFX-7 & 7+: Broadband 1.8 - Echo-Echo Verify (E-EV) - (Thru Paint & Coatings)
range 0.050 to 1.0 inches (1.27 to 25.4 millimeters). Will vary based on coating.
Display: 1/4 VGA AMOLED color display (320 x240
pixels). Viewable area 1.7 x 2.27 in (43.2 x
57.6 mm). 16 color pallete, multiple color options,
and variable brightness.
19 MHz (-3dB). DFX-7+: Three narrow bands at
2MHz, 5MHz, 10MHz.
Coating Only Mode (CT) - (Coating Thickness)
range 0.0005 to 0.100 inches (0.0127 to 2.54
millimeters). Range will vary +/- depending on
the coating.
One and two point calibration option for material & coating, or selection of basic material types.
Auto probe zero, recognition and temperature
High speed scan up to 50 readings per second.
Audible alarm with hi/lo limits.
Built-in differential mode for QC inspections.
Linear time dependent gain (TDG) with adjustable slope (dB per microsecond).
Screen Refresh Rate: 60Hz. Horizontal Linearity: +/- 0.4% FSW. Memory
Display Views: Flaw Detector: Full wave, +/- Recti7ed, or RF. Thickness Gauge: Digits, +/- Recti- Vertical Linearity: +/- 1% FSH. Log Formats: Grid (Alpha Numeric), or SequenMemory
tial (Auto Identi7er).
7ed, RF, or B-Scan. Ampli4er Linearity: +/- 1 dB. Capacity: 4 Gb internal SD card.
Resolution (selectable): +/- 0.001 in (0.01 mm )or
+/- 0.0001 in (0.001mm).
Amplitude Measurement: 0 to 100% FSH,
with 1% resolution.
Screen Capture: Bitmap graphic capture for
quick documentation (.tif ).
Timing: Precision TCXO timing with single shot Delay: 0 - 999in (25,375mm) at steel velocity. Custom Setups: 64 user con7gurations.
Resolution (selectable): +/- 0.001 in (0.01 mm)or +/- 0.0001 in (0.001mm). Flaw Detector Features Power Source
Timing: Precision TCXO timing with single shot 100 MHz 8 bit ultra low power digitizer. TRIG: Trigonometric display of beam path,
depth, surface distance, and curved surface correction.
Used with angle beam transducers.
Battery: Three 1.5V alkaline, 1.2V AA Nicad cells,
1.2V AA NI-MH, or other other equivalent power source.
Measurement Gates: Two independent gates
(Flaw), and three gates (thickness). Start & width
adjustable over full range. Amplitude 5-95%, 1%
steps. Positive or negative triggering for each
gate with audible and visual alarms.
DAC: Up to 8 points may be entered and used to
digitally draw a DAC curve. Reference -2, -6 -10, (-6/-12), (-6/-14), (-2/-6/-10) dB. Amplitude
displayed in %DAC, dB, or %FSH.
Battery life (continuous use): Alkaline (12
hrs), Nicad (5hrs), and NI-MH (12hrs), with default settings.
Operating Temperature: 14 to 140F (-10C to 60C). AWS: Automatic defect sizing in accordance
with AWS D1.1 structural welding code
Line Power: USB-C to PC or power outlet.
Environmental: Meets IP65 requirements. AVG/DGS: Automatic defect sizing using probe
data. Stores up to 64 custom setups
Calibration: TCG: Time corrected gain. 50 dB dynamic range,
20 dB per microsecond, up to 8 points for curve
Output: Direct USB-C 1.1 PC connectivity.
Automatic Calibration: Longitudinal (straight),
or Shear (angle).
Thickness Gauge Features Transducer Connectors: Two LEMO 00
Probe Types: Single Contact, Dual, Delay, and
Angle .
Measurement Mode: Pulse-Echo (P-E) range
0.025 in to 100 ft. (0.63mm to 3048 cm).
Units: English (in), Metric (mm).
Velocity: 0.0100 to .6300 in/µs (256–16,000 m/s).
Auto-Cal: Provides automatic calibration with two reference points. Thickness Gauge: Factory calibration traceable To LEMO 00 Certi4cation
to NIST & MIL-STD-45662A.
Test Range: 0.007 in (.178mm) to 1200 in (30,480mm) maximum at steel velocity.
Continuously variable.
Zero Offset (Probe Zero): 0–999.999 µs.
Material Velocity Table: Contains longitudinal
and shear velocities for a variety of material
Detection Modes: Zero Crossing, Flank and Peak. Flaw Detector: EN12668-1 compliant.
Pulser Display Freeze: Hold current waveform on
Warranty : 2 year limited
Pulser Type: Two adjustable square wave pulsers
and receivers.
Peak Memory: Captures peak signal amplitude.  
P.R.F.: 8 to 2000Hz in selectable steps (8, 16, 32,
66, 125, 250, 333, 1000, 2000Hz).
Skip Bar: Displays skip legs in the waveform area.  
Pulser Voltage: 100-200 volt peak amplitude,
rise/fall time < 10ns into 50ohm.
Measurement Modes (Dual & Single Element):Thickness Gauge Features Pulse-Echo Mode (P-E) - (Pit & Flaw Detection)
range 0.025 to 96 in (0.63mm to 244 cm). Single
Contact - 0.040 in to 100 ft. (1 mm to 3048 cm).
Pulse-Echo Coating Mode (PECT) -
Pulse Width: 40 to 400 ns. Selectable step options 40, 80 & 400 ns
(labeled spike, thin & wide).
Coating, Pit & Flaw Detection):
Material: 0.025 in
to 96 in (0.63mm to 244 cm). Coating: 0.001 to
0.100 inches (0.01 to 2.54 millimeters).
Pulse-Echo Temp Comp Mode (PETP) - (Pit &
Flaw Detection) Auto temperature compensation
-range 0.025 in to 96 in (0.63 mm to 244 cm).

Flaw Detector:

  •        Sizing Toolkits: DAC, AWS, TCG, DGS
  •        Exceptional visibility in sunlight (AMOLED) color VGA display (320x240 pixels)
  •        P. R . F. - 8 H z t o 2 k H z , adjustable
  •        Detection: Z-Cross, Flank & Peak

Thickness Gauge:

  •        Automatic: probe zero, probe recognition, and Temperature compensation
  •        Measurement: Variety of modes to address a number of applications
  •        Large data storage with multiple formats: Alpha numeric grid and sequential w/auto identifier
  •        Up to 12 hours of battery life using 3 AA cells


  •        PC & OSX reporting software
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