Temperature, Measurement Modes | Dakota Digital CMX manual

CMX High Performance Material & Coating Thickness Gauge

through air efficiently. By using a liquid couplant between the transducer and test piece the amount of ultrasound entering the test piece is much greater.

4.5 Temperature

Temperature has an effect on sound velocity. The higher the temperature, the slower sound travels in a material. High temperatures can also damage transducers and present a problem for various liquid couplants.

Since the sound velocity varies with temperature it is important to calibrate at the same temperature as the material being measured.

Normal temperature range

Most standard transducers will operate from 0°F to 180°F.

High temperature measurements

Special transducers and couplants are available for temperatures above 180°F up to 650°F with intermittent contact. It is necessary to cool the transducer, by submerging the transducer in water between readings, when measuring high temperatures.

Modes and temperature errors

In addition to errors caused by velocity changing with temperature, some modes (measurement techniques) are affected more than others. For example, dual element pulse-echo mode has larger errors due to changes in the temperature of the delay line. However, multi-echo techniques offer temperature compensation help to minimize these errors.

4.6Measurement Modes

In this section we will discuss the different measurements modes the CMX is capable of operating in, the transducers required, and the reasons for using specific modes:

Pulse-Echo Mode (Flaw & Pit detection) – Coating Off (P-E)

Pulse-echo mode measures from the initial pulse (sometimes referred to as an artificial zero) to the first echo (reflection). In this mode, either an automatic or manual zero can be performed depending on the zero probe function setting. If the manual mode has been selected, the transducer is placed on a reference disk, located on top of the CMX, and a key is pressed to establish a zero point for the particular transducer. If the Auto Zero feature is enabled, a simple key press will perform an electronic zero to establish the same zero point.

In this mode errors result from surface coatings and temperature variations. Since pulse-echo only requires one reflection, it is the most sensitive mode for measuring weak reflections (flaws) typically found when measuring heavily corroded metals.

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.

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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.

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