Dakota Ultrasonics Ultrasonic Corrosion Thickness Gauges
F.A.Q.
Why use a dual-element corrosion thickness gauge instead of a single-element precision gauge?
Dual-element transducers contain two separate piezoelectric crystals (one transmitter and one receiver) mounted at a slight roof angle on an acoustic delay line inside a single housing. This V-path "pitch-catch" geometry focuses ultrasonic energy just beneath the front surface and is far more effective at capturing scattered echoes reflected from irregular, rough, or pitted internal pipe and tank walls than a single-element precision probe.
How does Echo-Echo (Thru-Paint) mode eliminate paint and epoxy coating errors?
In standard Pulse-Echo (P-E) mode, the gauge measures the transit time from the initial probe pulse to the first back-wall echo—which includes both the coating and the metal wall. Because sound velocity in paint (~0.095 in/µs) is roughly one-third the velocity in carbon steel (~0.233 in/µs), every 0.010" of paint adds roughly 0.025"–0.030" of false thickness to a steel reading. In Echo-Echo (E-E / Thru-Paint) mode (available on the Checkline TI-25MXT, Dakota ZX-6 / ZX-6DL, ElektroPhysik MiniTest 440, and all CMX / MMX / MVX models), the gauge measures the time interval between two consecutive back-wall echoes reverberating strictly inside the metal substrate, completely canceling out the paint layer without scraping or sandblasting.
When do I need an A-Scan or B-Scan display on a corrosion thickness gauge?
- Digital-Only Gauges (ZX Series, TI-25MX / TI-25MXT): Ideal for routine thickness surveys on homogeneous carbon steel, stainless steel, aluminum, and plastic pipes or tanks.
- B-Scan Cross-Section Gauges (TI-MMX-SDL, Dakota MX1-DL, TI-CMXDLP, Dakota CMX2-DL): Recommended when you want to visually map and record the contour of the bottom wall surface as you drag the probe across a corroded pipe or tank plate.
- A-Scan + B-Scan Waveform Gauges (Checkline TI-MVX, Dakota MX2-DL / MVX): Essential for severe internal pitting, mid-wall laminations, coarse-grain castings, and high-temperature inspections where the operator needs to view the actual RF/rectified ultrasonic echo and adjust threshold gates, blanking, and gain manually.
Can these ultrasonic gauges measure cast iron, aluminum, and non-metallic materials like plastic or glass?
Yes. All Dakota Ultrasonics, Checkline, and ElektroPhysik MiniTest 440 gauges feature adjustable sound velocity (0.0120 to 0.7300 in/µs or 305 to 18,542 m/s on ZX/TI-25MX series) plus preprogrammed material velocities to measure carbon steel, stainless steel, aluminum, brass, copper, cast/ductile iron, glass, ceramics, and rigid plastics (such as PVC, PE, and nylon). For thick cast iron or attenuative plastics/composites, pairing the gauge with a lower-frequency 1.0 MHz or 2.25 MHz transducer ensures deeper acoustic penetration.
Dakota Ultrasonics ZX-1 Ultrasonic Wall Thickness Gauge Z-300-0001 / Z-300-0003
$1,275.00
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- Dakota Ultrasonics ZX-1 Ultrasonic Wall Thickness Gauge Z-300-0001 / Z-300-0003
- Manually adjust velocity to calibrate to any material type
- Resolution: .001" (0.01 mm)
- Includes NIST-Traceable Calibration Certificate, CE-Certified
- 5-Year Warranty, Made in USA
- Datalogging: NO
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Dakota Ultrasonics ZX-3 Ultrasonic Wall Thickness Gauge Z-302-0001 / Z-302-0003
$1,775.00
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- Dakota Ultrasonics ZX-3 Ultrasonic Wall Thickness Gauge Z-302-0001 / Z-302-0003 with T-102-2000 Probe
- Calibrate to known thickness or Select Material from 8 Presets
- Resolution: .001" (0.01 mm)
- Includes NIST-Traceable Calibration Certificate, CE-Certified
- 5-Year Warranty, Made in USA
- Datalogging: NO
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Dakota Ultrasonics ZX-5DL Data Logging Ultrasonic Wall Thickness Gauge Z-304-000...
$1,925.00
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- Dakota Ultrasonics ZX-5DL Data Logging Ultrasonic Wall Thickness Gauge Z-304-0001 / Z-304-0003 with USB Output
- Calibrate to known thickness or Select Material from 8 Presets
- Includes NIST-Traceable Calibration Certificate, CE-Certified
- 5-Year Warranty, Made in USA
- Datalogging: YES
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Dakota Ultrasonics ZX-6DL Thru-Paint Ultrasonic Wall Thickness Gauge Z-306-0001 ...
$2,075.00
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- Dakota Ultrasonics ZX-6 Through-Paint Ultrasonic Thickness Gauge Z-305-0001 / Z-305-0003 with T-102-2700 Probe with built-in memory & USB Output
- Calibrate to known thickness or Select Material from 8 Presets
- Includes NIST-Traceable Calibration Certificate, CE-Certified
- 5-Year Warranty, Made in USA
- Built-in datalogging for 10,000 data values with USB Output
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Dakota CMX10-DL Full Wave Capture Ultrasonic Thickness Gauge
$5,405.00
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- Touchscreen and button keypad supports operation in the harshest environments
- Heavy duty, rubberized, impact resistant, dust and waterproof case up to IP65
- Save up to 20,000 A-Scans on 128MB internal storge or approximately 5 million on a 32GB external memory card
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Dakota Ultrasonics CMX1-DL (CMXDL) Data-Logging Ultrasonic Coating Thickness Z-1...
$2,400.00
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- Dakota Ultrasonics CMX1-DL (CMXDL) Data-Logging Ultrasonic Coating Thickness Z-171-0003 / Z-171-0005
Resolution: .001" (0.01 mm)
Datalogging: YES
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Dakota Ultrasonics CMX2-DL (CMXDLP) Data-Logging Ultrasonic Coating Z-187-0003 /...
$3,525.00 - $3,725.00
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- Dakota Ultrasonics CMX2-DL (CMXDLP) Data-Logging Ultrasonic Coating and Wall Thickness Gauge Z-187-0003 / Z-172-0005
Resolution: .001" (0.01 mm)
Datalogging: YES
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Dakota Ultrasonics CX Thickness Gauges
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- Auto recognition, ensures correct probe is identified when transducer is changed
- Scan Mode at 16Hz, ideal for measuring a large surface area
- User selectable reading resolution; 0.1mm (0.01") or 0.01mm (0.001")
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Dakota Ultrasonics MX2-DL (MVX) Ultrasonic Thickness Gauge Z-149-0004 / Z-149-00...
$2,850.00
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Dakota Ultrasonics MX2-DL (MVX) Ultrasonic Thickness Gauge Z-149-0004 / Z-149-0006 with Enhanced Display with Enhanced graphic scope Displays A Scan & B Scan for a cross section view
Resolution: .001" (0.01 mm)
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Dakota Ultrasonics PZX1-DL (PZX-7DL) Data-Logging Precision Z-308-0001 / Z-308-0...
$2,350.00
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- Dakota Ultrasonics PZX1-DL (PZX-7DL) Data-Logging Precision Ultrasonic Wall Thickness Gauge Z-308-0001 / Z-308-0002 with T-402-5507 Probe with Built-in Datalogger with USB Output
- Resolution: .0001" (0.001 mm)
- Calibrate to known thickness or Select Material from 8 Presets
- 5-Year Warranty, Made in USA
- Datalogging: Built-in datalogging for 10,000 data values, USB Output
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