CHAPTER EIGHT

THRU PAINT MEASUREMENT TECHNIQUE

8.1 Introduction to Thru Paint Measurement

The principle behind thru paint measurement is by measuring the time between two backwall echoes returning from the test material. Since both of these backwall echoes travel the same path through the paint or coating, the thickness of the coating is subtracted out of the measurement so that only the actual material thickness can be measured. This feature saves the user a great deal of time scraping and removing the coating from tanks and pipes during the inspection process.

The primary purpose of thru paint measurement is to determine actual or overall material thickness by eliminating the coating thickness. Thru paint mode cannot be used for flaw or pit detection. Therefore, inspectors may need to use echo-echo thru paint mode in conjunction with the standard pulse-echo flaw detection mode for some applications. Chassis tubing inspectors and sanctioning bodies will use the echo - echo mode for tubing with powder coatings, and pulse-echo mode for tubing without coating. The combination of using both modes is ideal for the advanced inspectors needs.

8.2 Using Thru Paint Mode

The first thing to note in this section, is that by selecting the transducer type from the list of probes stored in the CMX, a basic echo-echo thru paint configuration is recalled from memory. Each of the transducers in the list contains pre-configured echo-echo settings. The standard transducer that will be used for common steel applications ¼” 5MHz high damped transducer (1/4IN – 5.0MHZ HD). This is the recommended transducer for this industry and should be used for thru paint applications. Any of the auto recognition coating transducers are also high damped transducers and will work in echo-echo mode as well.

Note: When a transducer is selected for use, all of the measurement modes available for use with this transducer can easily be determined by pressing the multi- mode button on the keypad. The CMX has been programmed to identify the modes available to a specific transducer.

Once the transducer type has been selected and the appropriate calibration procedure completed, the CMX can toggle between pulse-echo(flaws & pits), and echo-echo(thru paint) modes by simply pressing the MULTI MODE key located on the keypad. Refer to page 38 for additional information.

The CMX can also be configured for thru paint applications by selecting a factory setup stored in the list of setups in the CMX. Refer to page 86 for information on recalling a setup. Once either the transducer type or setup has been selected, the inspector is ready to begin making measurements.

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Dakota Digital CMX operation manual Chapter Eight Thru Paint Measurement Technique, Introduction to Thru Paint Measurement
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CMX specifications

Dakota Digital CMX series represents a cutting-edge advancement in the world of digital instrumentation, designed specifically for automotive enthusiasts and restorers seeking to enhance their vehicle’s dashboard aesthetics and functionality. Characterized by its sleek appearance and intelligent design, the CMX offers a multitude of features that cater to modern demands while preserving the classic vehicle feel.

One of the standout features of the Dakota Digital CMX is its customizable display. The series provides an array of screen layouts and color schemes that allow users to personalize their instrumentation according to individual preferences. This flexibility not only enhances the visual appeal but also aids in quickly obtaining critical information at a glance, improving overall driver convenience.

The CMX is equipped with state-of-the-art technology, including high-definition OLED displays that ensure crisp visibility in all lighting conditions. This technological advancement makes the instrument panel not only easy to read but also optimally functional in both bright sunlight and low-light situations. The ambient light sensors adjust brightness automatically, promoting user comfort.

Another defining characteristic of the Dakota Digital CMX is its comprehensive data logging and diagnostic capabilities. Integrated advanced sensors enable real-time monitoring of various vehicle metrics, such as speed, RPM, fuel level, and engine temperatures. This feature aids users in maintaining their vehicle's performance and in diagnosing potential issues before they escalate into more severe problems.

The CMX series supports numerous vehicle types, with a compatibility range that includes classic muscle cars, street rods, and even motorcycles. Furthermore, it incorporates Bluetooth technology, allowing users to connect their smartphones for further customization and real-time data analysis via an associated app.

Installation is designed to be user-friendly, making it accessible even for those with limited automotive knowledge. The system typically utilizes plug-and-play wiring harnesses, simplifying the overall setup process. Additionally, the CMX series is engineered to withstand the harsh environments often found in automotive applications, ensuring durability and longevity.

In summary, the Dakota Digital CMX series exemplifies a harmonious blend of modern technology and classic style. With customizable displays, advanced diagnostics, excellent visibility, and robust construction, it is a top choice for those looking to elevate their vehicle’s instrumentation. The CMX not only provides essential information but also transforms the driving experience, making it both informative and enjoyable.
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