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NDT Instruments
Thickness Measurement on Internally Corroded Metals

Thickness Measurements on Internally Corroded Metals

Using Dual Element Transducers

One of the major applications of the 45MG is measuring the remaining thickness of pipes, tubes, tanks, pressure vessels, ship hulls, and other structures affected by corrosion or erosion. Dual element transducers are most commonly used for these applications.

  • Automatic Probe Recognition for standard D79X series dual element transducers
  • Calibration Doubling warning when echo doubling may occur during calibration
  • The Echo-to-Echo / THRU-COAT® option allows for measurements on painted and coated surfaces
  • High temperature measurements; up to 500 °C (932 °F)

B-scan Mapping (Time-based)

The 45MG gage B-scan feature converts live thickness readings into cross-sectional images drawn on the display. This standard feature is very helpful in viewing the changes in thickness measurements over a distance. The B-scan is activated as soon as the transducer makes contact with the surface of the material. The Freeze Minimum function is used to display the minimum thickness of the scanned area. The optional 45MG datalogger can store up to 10,000 thickness readings in a single B-scan.

B-scan mode screen
Indoor display setting, B-scan mode

Dual element series inspecting corroded metal


High Temperature Surfaces

The 45MG is ideally suited for making stable thickness measurements on hot material surfaces (up to 500 ºC or 932 ºF) with the D790 series transducers (D790, D790-SM, D790-RL, and D790-SL). The Zero Compensation feature of the 45MG enhances the accuracy of measurements on hot surfaces by compensating for temperature changes in the transducer delay line due to thermal drift.

dual element transducer inspecting corroded metal

D790 series transducer

Echo-to-Echo / THRU-COAT® Option

Echo-to-Echo

The gage displays the true metal thickness and ignores the thickness of the coating layer, using multiple back-wall echoes:

  • Auto Echo-to-Echo
  • Manual Echo-to-Echo (with A-scan option only) that allows:
    • Gain Adjust
    • Extended Blanking
    • Echo Blanking

THRU-COAT Technology

Uses a single back-wall echo to measure true metal thickness. You can display the metal and coating thicknesses, each adjusted for their correct material sound velocities. There is no need to remove paint and coatings from surfaces. THRU‑COAT measurements use the D7906-SM, D7906‑RM, and D7908 dual element transducers. D7906

Auto Echo-to-Echo Mode
Auto Echo-to-Echo mode with A-scan
Thru Coat Mode
THRU-COAT mode showing thickness of coating and steel (waveform not activated)
Manual Echo-to-Echo
Manual Echo-to-Echo adjusting the First Echo blank
Thru-Coat Mode Wave
THRU-COAT mode with optional waveform

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