Thickness Gauges - Ultrasonic - Thru-Coating and A-Scan Thickness Gauges - Dakota Standard Pulse-Echo & Thru-Coating Gauges

How Pulse-Echo Mode Works

1. Couplant 3. Testing Material

How Echo-Echo Mode Works

1. Couplant 2. Coating 3. Test Material

Pulse-Echo (P-E) and Echo-Echo (E-E) Capability

The following gauges have both Pulse-Echo (P-E) and Echo-Echo (E-E) Modes.

ZX-6 / ZX-6DL

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Pulse-Echo (P-E) mode
Echo-Echo (E-E) mode
Data Logger (DL) option
5 Year Limited Warranty

MMX-7

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Pulse-Echo (P-E) mode
Echo-Echo (E-E) mode
Data Logger (DL) option
B-Scan
2 Year Limited Warranty

MVX

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Pulse-Echo (P-E) mode
Echo-Echo (E-E) mode
Data Logger (DL)
A-Scan
B-Scan
2 Year Limited Warranty

Pulse-Echo (P-E) and Echo-Echo (E-E) 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.

ZX-6 in Pulse-Echo (P-E) Mode A-Scan showing P-E measurement

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.

Display Modes

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A-Scan Display

A-Scan shows the signal that is being measured.

Strong Back Wall Echo and Multiple Echo

B-Scan

B-Scan graphs a series of measurements. This results in a profile view that is helpful to understand if the material has a single or series of pits, general corrosion, inclusion or lamination.

Consistent Back Wall Echo

Digital Display

The CMX Series' digital display is simple, direct reading, and can add min/max.

Digital Display with Min & Max

A-Scan vs. B-Scan Measurements

A-Scan		B-Scan
Pitted material will show a signal coming before the Back-Wall Echo and a diminished or non-existent the Back Wall Echo, depth measurement will be inconsistent and vary point to point		B-Scan showing various irregular thicknesses
An inclusion will show a signal coming before the Back Wall Echo but the Back Wall is unaffected.		B-Scan shows inclusions at consistent depth (plateau)
A lamination usually at mid-wall and of consistent depth		B-Scan showing a plateau of considerable length

Gauge / Mode Quick Reference Chart

	ZX-6	MMX-7	MVX	CMX 2.0 / CMX-DL	CMX-DL+	CMX-DL+ Color	UMX-2
P-E	✓	✓	✓	✓	✓	✓	✓
E-E	✓	✓	✓	✓	✓	✓	✓
PECT	X	X	X	✓	✓	✓	X
Single-Triple Echo	X	X	X	X	X	X	✓
B-Scan	X	✓	✓	✓	✓	✓	X
A-Scan	X	X	✓	X	✓	✓	X
Hi-Speed & Color	X	X	X	X	X	✓	X
Data Logging	✓	✓	✓	✓	✓	✓	X