Dakota CMX Corrosion Thickness Gauges

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Dakota CMX Corrosion Thickness Gauges

Product Description

Top of the range and easy to use, the Dakota CMX Corrosion Thickness Gauges provide inspectors with all the features necessary to measure the material and coating thickness at the same time.

User definable limits for pass/fail indication

Set limits for pass/fail indication on individual reading or for each batch with audible & visual warnings.

Store each measurement for further analysis

Up to 4GB of readings can be saved into the gauge memory as each measurement is taken, which can be downloaded later into an inspection application or into DakMaster^™ Software for further analysis and reporting.

Able to measure coating and material thickness

The Dakota CMX Ultrasonic Thickness Gauges have the ability to measure coatings and material thickness simultaneously while maintaining the ability to locate pits, flaws and defects in the material.

Choose & customise the reading display

The Dakota CMX Thickness Gauge range has a choice of display modes allowing the user to select the most appropriate for their needs; Readings, B-Scan, B-Scan combined with readings, Scan bar & the A-Scan on the Dakota CMX2-DL Corrosion Thickness Gauge and Dakota CMX3-DL Corrosion Thickness Gauge.

Dakota CMX Corrosion Thickness Gauges

The Dakota CMX ultrasonic corrosion thickness gauge is available in four models – from an entry level Dakota CMX1 Ultrasonic Thickness Gauge to the top of the range Dakota CMX3-DL Ultrasonic Thickness Gauge.

Range of display & measurement options: Pulse-Echo, Echo-Echo, Pulse-Echo Temp, Comp Mode (PETP), Coating Only Mode (CT), Pulse-Echo Coating Mode (PECT)
Manual or automatic gain control (AGC) with adjustable 110dB range
Gate control
Threshold adjustment
64 User defined setups
Multiple language display
Multiple calibration and material selection options
High speed scan mode: 250 readings per second (Dakota CMX1 Ultrasonic Thickness Gauge and Dakota CMX1-DL Ultrasonic Thickness Gauge), 50 readings per second (Dakota CMX2-DL Ultrasonic Thickness Gauge and Dakota CMX3-DL Ultrasonic Thickness Gauge)
A-Scan portrait & landscape views (Dakota CMX3-DL Ultrasonic Thickness Gauge only)
Differential and minimal thickness alarm modes
Data output and storage: 4GB internal memory
Download to DakMaster^™ data management software

Key Features

Repeatability / Stability Indicator

Consisting of 6 vertical bars, when all the bars are fully illuminated and the last digit on the digital thickness value is stable, the gauge is reliably measuring the material thickness.

High Speed Scan with Minimum Thickness Display

By significantly increasing the measurement refresh rate this mode allows the user to make scanned passes over the test material. The smallest thickness value is held in memory and displayed when scanning is complete. This feature can also be used in conjunction with the minimum & maximum limit alarm feature (model dependant).

Differential Mode

Once a user defined nominal thickness value has been set, the gauge will display the +/- thickness difference from the nominal value entered.

Limit Alarm Mode

The user can define minimum and maximum thickness limits. If the measurement falls outside the upper or lower limit a red LED will light and the beeper sounds. A green LED will light to indicate an acceptable thickness.

V-Path Correction

Dual element transducers consist of a probe with two crystals (one to transmit and one to receive the sound pulse). The crystals are separated by an acoustic barrier – generating a ‘V-shaped’ sound path as the sound travels from one element to the other. This path is slightly longer than the direct path therefore V-path correction is used to calculate the correct thickness

Measurement Modes Explained

Pulse – Echo Mode (PE):

The normal display mode, measures the total thickness from the base of the transducer probe to the material density boundary (typically the back wall). Ideal for pit and flaw detection.

Echo – Echo Mode (EE):

Also known as the ThruPaint™ Mode, EE ignores the coating thickness, displaying the material thickness from the top surface of the material to the material density boundary.

Pulse – Echo Temp Comp Mode (PETP):

Similar to the PE mode, PETP takes into account and compensates for the variations in measurement caused by temperature variations.

Echo – Echo Verify Mode (EEV):

The echo-echo verify mode measures by comparing the values between 3 reflections and is commonly used to eliminate errors from surface coatings and to make measurements in multiple layered materials.

Coating Only Mode (CT):

Displays the thickness of the coating applied to the material.

Pulse – Echo Coating Mode (PECT):

Displays both the material thickness (PE) and the coating thickness (CT) at the same time.

Basic Flaw Mode (FLAW MODE):

Basic prove-up flaw detection using single element angle beam transducers is available on the CMX2-DL and CMX3-DL corrosion thickness gauges.

Display Modes Explained

Material Thickness Digits Display:

The standard display on all models, this displays the numerical thickness value in either millimetres (MM)or inches (IN).

Scan Bar Display:

A linear graphic display which allows users to graphically monitor changes in thickness readings. As the scale range can be adjusted by the user, this display is ideal for observing tiny variations in material thicknesses.

B-Scan Display:

A time based cross sectional 2D block view of the thickness provides a graphical view of the material thickness – ideal for relative depth analysis.

A-Scan Display; Full Wave (RF):*

The A-Scan display shows the sine wave created by the reflected sound, or oscillation, from the material being measured. In RF mode the full wave form is displayed.

A-Scan Display; Rectified (+ or -):*

Users can select to view either the positive or the negative cycle of the full waveform (RF). This rectified (RECT) display shows the amplitude of the echo versus the transit time.

* Available on CMX2-DL and CMX3-DL thickness gauge Models only

Product Features

Model	CMX1	CMX1-DL	CMX2-DL	CMX3-DL
Display Mode
Material thickness digits display	•	•	•	•
B-Scan cross sectional display	•	•	•	•
Combined B-Scan and digits display	•	•	•	•
Coating Thickness Display	•	•	•	•
Scan Bar Display
A-Scan Display				+ Rectified, – Rectified, Full Waveform (RF) Portrait & landscape views
Measurement Range	PE: 0.63 – 1219.2mmPETP: 0.63 – 1219.2mm EE: 2.54 – 152.4mm EEV: 1.27 – 25.4mm CT: 0.01 – 2.54mm PECT: 0.63 – 1219.2mm PECT: 0.01 – 2.54mm	PE: 0.63 – 1219.2mmPETP: 0.63 – 1219.2mm EE: 2.54 – 152.4mm EEV: 1.27 – 25.4mm CT: 0.01 – 2.54mm PECT: 0.63 – 1219.2mm PECT: 0.01 – 2.54mm	PE: 0.63 – 1219.2mm PETP: 0.63 – 1219.2mm EE: 2.54 – 152.4mm EEV: 1.27 – 25.4mm CT: 0.01 – 2.54mm PECT: 0.63 – 1219.2mm PECT: 0.01 – 2.54mm	PE: 0.63 – 1219.2mm PETP: 0.63 – 1219.2mm EE: 2.54 – 152.4mm EEV: 1.27 – 25.4mm CT: 0.01 – 2.54mm PECT: 0.63 – 1219.2mm PECT: 0.01 – 2.54mm
Measurement Rate
Manual	8 readings per second	8 readings per second	8 readings per second	8 readings per second
Scan Mode	250 readings per second	250 readings per second	50 readings per second	50 readings per second
Scan bar display	10 readings per second	10 readings per second	10 readings per second	10 readings per second
Measurement Resolution	0.01mm	0.01mm	0.01mm, 0.001mm selectable	0.01mm, 0.001mm selectable
Velocity Calibration Range	309.88 – 18,542m/s	309.88 – 18,542m/s	309.88 – 18,542m/s	309.88 – 18,542m/s
Additional Features
High Speed Scan Mode				•
Differential Mode				•
Limit alarm mode				•
B-Scan Display Speed	15 readings per second	15 readings per second	15 readings per second	10 to 200 readings per second
Flaw Mode			Basic prove-up flaw detection using single element angle beam transducers	Basic prove-up flaw detection using single element angle beam transducers
Calibration Setups				64 user-definable setups transferable to and from a PC archive
Gates			3 fully adjustable gates: start, stop, width & threshold	3 fully adjustable gates: start, stop, width & threshold
Damping			Adjustable damping (50 – 1500ohms)	Adjustable damping (50 – 1500ohms)
Pulser Type	Dual square wave pulsers Pulse repetition frequency up to 250Hz	Dual square wave pulsers Pulse repetition frequency up to 250Hz	Dual square wave pulsers Pulse repetition frequency up to 250Hz	Dual square wave pulsers Pulse repetition frequency up to 250Hz
Gain	Manual or automatic gain control (AGC) with 110dB range (limited)	Manual or automatic gain control (AGC) with 110dB range (limited)	Manual, automatic gain control (AGC) with 110dB range (limited), Linear time dependent gain (TDG) with adjustable slope	Manual, automatic gain control (AGC) with 110dB range (limited), Linear time dependent gain (TDG) with adjustable slope
Timing	Precision temperature controlled crystal oscillator (TCXO) timing with single shot 100MHz 8bit ultra-low power digitizer	Precision temperature controlled crystal oscillator (TCXO) timing with single shot 100MHz 8bit ultra-low power digitizer	Precision temperature controlled crystal oscillator (TCXO) timing with single shot 100MHz 8bit ultra-low power digitizer	Precision temperature controlled crystal oscillator (TCXO) timing with single shot 100MHz 8bit ultra-low power digitizer
Memory and Data Logging	• 4GB internal memory • Sequential and grid logging • Alpha numeric batch identification • OBSTRUCT indicates inaccessible locations • Bitmap graphic capture and capture viewer	• 4GB internal memory • Sequential and grid logging • Alpha numeric batch identification • OBSTRUCT indicates inaccessible locations • Bitmap graphic capture and capture viewer	• 4GB internal memory • Sequential and grid logging • Alpha numeric batch identification • OBSTRUCT indicates inaccessible locations • Bitmap graphic capture and capture viewer	• 4GB internal memory • Sequential and grid logging • Alpha numeric batch identification • OBSTRUCT indicates inaccessible locations • Bitmap graphic capture and capture viewer
Calibration Options
1 – point	•	•	•	•
2 – point	•	•	•	•
Material selection	•	•	•	•
Velocity (speed of sound)	•	•	•	•
Transducer Probe Type	Dual element	Dual element	Dual element	Dual Element, Single Element (1 – 20Mhz), Contact, Matching Layer, Delay Line and Pencil
Transducer Frequency Range	1 – 10MHz	1 – 10MHz	1 – 10MHz	1 – 20MHz
Transducer Recognition	Automatic & manual – selectable from a list	Automatic & manual – selectable from a list	Automatic & manual – selectable from a list	Automatic & manual – selectable from a list
V-path / dual path error correction	Automatic	Automatic	Automatic	Automatic
Probe Zero	Automatic & manual (via integrated probe disk)	Automatic & manual (via integrated probe disk)	Automatic & manual (via integrated probe disk)	Automatic & manual (via integrated probe disk)
Display	1/8 VGA (greyscale) 62 x 45.7mm viewable area	1/8 VGA (greyscale) 62 x 45.7mm viewable area	1/8 VGA (greyscale) 62 x 45.7mm viewable area	1/4 VGA AMOLED colour display 57.6 x 43.2mm viewable area Landscape Mode
Display Refresh Rate	25Hz	25Hz	25Hz	120Hz
Units (selectable)	mm or inches	mm or inches	mm or inches	mm or inches
LED Backlight	on/off/auto	on/off/auto	on/off/auto	adjustable brightness
Repeatability / Stability Indicator	•	•	•	•
Battery Save Mode	Auto	Auto	Auto	Auto

¹ Measuring range & accuracy depends on material, surface conditions and the transducer selected

Specifications