Dakota Standard Pulse-Echo & Thru-Coating 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

$1775 / $1975

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

MMX-7

$2125

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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

$2625

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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.

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

Display Modes

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