Dakota HPX DL+ High Penetration Thickness Gauge

Dakota HPX DL+ High Penetration Thickness Gauge

Made in the USA

High Penetration A-Scan Thickness Gauge

The HPX was designed specifically for use on materials that are difficult for a standard ultrasonic instrument to penetrate. This is usually due to a coarse grain structure that attenuates the sound beam. The HPX has multiple high voltage pulser options, as well as filters tuned for lower frequency transducers (500 kHz – 10 MHz), the HPX compliments our product range by adding additional material types to our list of application possibilities. 

Some materials that can be measured with the HPX include: Fiberglass, carbon fiber, coarse grained cast metals, rubber, high density polyethylene (HPDE), fiber reinforced plastic (FRP), lead and all steels and aluminums.

Applications Include: Fiberglass sheets, pipes, storage tanks, aerospace composites, boat hulls, conveyor belts, composite plastics, etc.

Measurement Modes

Pulse-Echo Mode (P-E)

Pulse-Echo (P-E) Mode measures from the surface to the back-wall echo. It is used on bare material to determine wall loss on corroded, eroded and pitted materials. When measuring through a coating the measurement will include an error due to the coating thickness x 2-3 because of the difference in sound velocity between the coating and test material.

1. Couplant 3. Testing Material

Echo-Echo (E-E) Mode

Echo-Echo (E-E) Mode measures from the back-wall echo to its multiple-echo and eliminates the error due to the coating. Measurements can only be made on materials that have parallel surfaces as the multiple-echo will disappear if the back-wall is corroded or pitted.

1. Couplant 2. Coating 3. Testing Material

Technical Specifications

HPX DL+ Specifications

Measurement Modes
Pulse-Echo (P-E): Contact transducers
Echo-Echo (E-E): Contact transducers
Echo-Echo Verify (E-EV): Contact transducers.
Spike - 200 volt adjustable.
Square wave: 400 volt adjustable.
Tone Burst: 400 volt adjustable with selectable frequency.
Receiver: Manual or AGC gain control with 110dB range, varies with mode selected. Adjustable damping (50, 75, 100, 300, 600 & 1500 ohms).
Frequency Range: 500 kHz to 10 MHz
Timing: Precision TCXO timing with single shot 100 MHz 8 bit ultra low power digitizer.
Measuring Range
Pulse-Echo Contact: Steel: .050 in. – 100.0 ft. (1.27 mm – 30.5 M). Composites: .100 in. – 5.00 in. (2.54 mm – 127 mm).
Echo-Echo Contact: Steel: .100–3.0 ft. (2.54–91.44 cm).
Echo-Echo Verify Contact: Steel: .100–6.0 in. (2.54–152.4 mm).
Resolution (selectable):
+/- .01 inch (0.1 mm).
+/- .001 inch (0.01 mm).
Velocity Range: 0.0122 to 0.7300 inches/µs (309.88 to 18542 meters/sec)
Single and Two point calibration option, or selection of basic material types.
Units: Imperial & Metric
Display Views
A-Scan: Rectified +/- (flaw view) RF (full waveform view). Refresh rate at 25 Hz.
B-Scan: Time based cross section view. Display speed variable (10 to 200 readings per second).
Large Digits: Standard thickness view; Digit Height: 0.700 in (17.78 mm).
Scan Bar: Speed 10 Hz. Viewable in B-Scan and Large Digit views.
Bar Graph: Measurement stability.
Setups: 64 custom user-defined setups.
Gates: 3 adjustable gates, depending on measure mode selected.
Alarm Mode: Set Hi and Lo tolerances with audible beeper and visual LEDs.
Scan Mode: Takes 250 readings per second and displays the minimum reading found when the transducer is removed.
Physical Attributes
Dimensions (WxHxD) : 2.5" x 6.5" x 1.24" (63.5 x 165 x 31.5mm)
Weight: 13.5 oz. (with batteries)
Keyboard: Membrane switch pad with twelve tactile keys.
Data Output: USB-C port. Windows® PC interface software.
Display: 1/8in VGA grayscale display (240 x 160 pixels); viewable area 2.4 x 1.8in (62 x 5.7mm); EL backlit (on/off/auto invert).
Operating Temperature: 14 to 140F (-10C to 60C)
Case: Extruded aluminum body with nickel-plated aluminum end caps (gasket sealed).
Power Source
Line Power: USB-C to PC or power outlet.
Batteries: Three AA cells. Alkaline - 35 hrs., Nicad - 10 hrs. and NI-MH - 35hrs.
* Dependent on pulser & backlight settings
Auto power off if idle 5 minutes.
Battery status icon.
Log Formats: Grid (Alpha Numeric), or Sequential (Auto Identifier).
Capacity: 4 Gb internal SD card
Screen Capture: Bitmap graphic capture for quick documentation (.tif ).
OBSTRUCT to indicate inaccessible locations.
Factory calibration traceable to NIST & MILSTD-45662A.
2 yr. limited

Kit Includes

HPX DL+ Kit Includes

  • Unit
  • Custom 1" Delay Line Transducer (Rubber Delay Line) & Cable
  • Couplant
  • Manual
  • Certificate of Calibration
  • AA Batteries
  • Plastic Carrying Case
  • PC Software download & transfer cable included
  • 2 Year Limited Warranty


Standard Single Element Delay Line Transducer
(HPD) - High Penetration

Element Size (Dia.) A B
1.00" 1.060" 2.800"
Description Replaceable rubber delay line low frequency transducers.
Used Fiberglass, composite plastics, plastics, carbon fiber, rubber conveyor belts.
Damping Medium
Connector BNC top connect only

Protective Case Options

PN: UT-DU-F-149-0001

PN: UT-DU-A-149-6002

Includes 2 Year Limited Warranty

Description Part # Saved Price Select Option Add to
Dakota HPX DL+ Thickness Gauge Kit Includes: Unit, custom 1” Delay Line Transducer (Rubber Delay Line) & Cable, Couplant, Manual, Certificate of Calibration, AA Batteries and Plastic Carrying Case. PC Software (download) & transfer cable included. UT-DU-Z-225-0001 $3,650.00
Dakota HPD1005B - HPD 1.0” x 500 kHz BNC Single Element Delay Line Probe UT-DU-T-407-8605 $1,050.00
Dakota Ultrasonics Nylon protective instrument case with neck strap (for A-Scan/B-Scan Instruments) UT-DU-F-149-0001 $85.00
Dakota Ultrasonics Injection molded rubber protective instrument case with neck & hand straps and a kickstand for A-Scan/B-Scan instruments UT-DU-A-149-6002 $110.00