Dakota Digital CMX Chapter Eight Thru Paint Measurement Technique, Using Thru Paint Mode

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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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Contents CMX Page Appendix a Setup Library Page Disclaimer Chapter ONE IntroductionCMX Overview Chapter TWO Quick Startup GuidePage Probe Automatically Recognized Auto Probe RecognitionSelecting the Transducer Type Selecting the Transducer Type Probe Zero & Calibration Coating Probe Identified Coating Probe Not Identified Performing an Auto Probe Zero Off BlockPerforming a Manual Probe Zero On Block One Point Material Calibration Using a Known Thickness Zero Coating Performing a Coating Zero Coating Calibration Known Coating Velocity Using a Known Coating VelocityKnown Coating Thickness Using a Coating Sample to CalibratePage Selecting the Measurement View Option MeasureAdjusting B-START & B-DEPTH Digit Edit Box as follows Digits Menu Key Operation & Sub Menus Chapter Three KEYBOARD, MENU, & Connector ReferenceGetting Around in the Sub Menu Items Activating and Getting Around in the Menu ItemsCAL Menu Probe MenuTune Menu Disp display MenuUtil utilities Menu Setup MenuXfer transfer Menu Meas measurement mode KeyCLR clear Key OK KeyArrow Keys Multi Mode KeyEnter key 16 ON/OFF KeyProbe Zero Disk & Battery Cover Transducer ConnectorsRS-232 Connector Top & Bottom End CapsTime versus thickness relationship Chapter Four Principals of Ultrasonic MeasurementSuitability of materials Range of measurement and accuracyMeasurement Modes TemperaturePath Correction Echo-Echo Mode Thru-Paint E-ECoating Mode Coating Only CT Pulse-Echo Temperature Compensated Mode Temp Comp Petp Chapter Five Selecting the Measurement Mode Setup libraryWhich mode & transducer do I use for my application? Thru Paint & Coatings High temperatureCoating Only Thin materialsRestricted access Factory Setup ChartAuto Probe Recognition & Selecting The Transducer Type Chapter SIX Making MeasurementsProbe Automatically Recognized Selecting the Transducer Type Page Coating Probe Identified Coating Probe Not Identified Probe zeroPerforming a Manual Probe Zero On Block Coating Probe Identified Coating Probe Not Identified Using a Known Material Velocity Material CalibrationKnown Velocity Page Page One Point Calibration Known ThicknessPage Two Point Calibration Basic Material Type Selecting a Basic Material Type Page Chapter Seven Using the Digits & B -SCAN Displays Digits View Display ViewsScan View ScanPage Activating B-Scan View Enabling the B-Scan FeatureStarting depth B -START Adjusting the B-Scan Start B-START & Depth B-DEPTHAdjusting the Starting Depth B-START Overall range B-DEPTH Adjusting the Overall Depth B-DEPTHPage Gain Adjusting the Gain Using Thru Paint Mode Chapter Eight Thru Paint Measurement TechniqueIntroduction to Thru Paint Measurement Coating modes can be enabled in three different ways Enabling Pulse-Echo Coating Mode Pect & Coating CTChapter Nine PULSE-ECHO Coating & Coating Techniques Introduction to Pulse-Echo Coating Measurement PectProbe Automatically Recognized Pect only Applied to Metals Not Applied to Metals Multi Mode Key Pressed Pect & CTMeasure Mode Tabbed Menus Pect & CT Zero Coating Page Coating Calibration Pect Known Velocity Page Known Thickness Page Two Point Coating Calibration CT Known Thickness Introduction to Coating Measurement CTOne Point Calibration Page Two Point Calibration Page Chapter TEN Additional Features of the CMX Using the Scan ModeHigh Speed Scan Toggle Alarm on/off Alarm ModeSetting the Alarm Low Limit Toggle Differential on/off Differential ModeSetting the Differential Value Chapter Eleven Setups CREATE, STORE, EDIT, & Recall Introduction to SetupsOpening a Setup Opening a Setup Saving a Setup Saving a Setup Page Page Deleting a Setup Deleting a Saved SetupUsing the Default Setup Using the Default Setup Selecting a Language Installing DakView Chapter Twelve Using the Utility SoftwareComputer System Requirements USB to Serial ConverterAccessing and Using the Xfer Menu Using the Xfer menu CMXPVC Appendix a Velocity TableCMX High Performance Material & Coating Thickness Gauge Appendix a Setup Library

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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