Non-Destructive Testing Equipment · Ultrasonic Testing Equipment

Digital Ultrasonic Flaw Detector

Digital ultrasonic flaw detector with 150 to 800 MHz sampling, DAC and AVG curves, 500 inspection channels and U-disk storage on the upper models, for weld, forging and plate inspection.

KUT350 (4 models) ·

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Key specifications

Model
KUT350 / KY880S / KY990S / KY9901PLUS
Sampling frequency
150 MHz / 200 MHz / 320 MHz / 800 MHz respectively
Scanning range
0 to 10000 mm on the KUT350; 0 to 6000 mm on the KY880S; 15 to 10000 mm on the KY990S; up to 15000 mm on the KY9901PLUS
Sound velocity
1000 to 15000 m/s on the KUT350 as the card figure, with 100 to 20000 m/s also printed on the same page; 100 to 15000 m/s and 100 to 20000 m/s on the upper models
Gain
0 to 120 dB on the KUT350, KY990S and KY9901PLUS; 0 to 110 dB on the KY880S
Sensitivity margin
62 dB or better on the KUT350 as the card figure, 65 dB in its detail table, and above 62 dB or 65 dB on the other models
Inspection channels
500 groups across the range
Storage
100 A-scan traces on the KUT350 and KY880S; U-disk storage on the KY990S and KY9901PLUS
Probe modes
Single-crystal and dual-crystal working, selectable
Curve functions
DAC and AVG on the KUT350; the KY9901PLUS adds surface correction and crack height measurement

An ultrasonic flaw detector is used where the defect of interest is inside the material and no surface method will reach it. Sound is sent into the part, what comes back is timed, and a discontinuity ahead of the back wall announces itself as an earlier echo at an amplitude that says something about its size.

The instrument is only half of that measurement. Which echoes appear, and what they mean, depends on the probe that sent the sound and on the calibration that gives the return an absolute meaning - and both of those are agreed per job rather than bought off a shelf.

What the instrument is

A body with a display, a probe and a calibration. The body generates the pulse, times the return, applies the gain and displays the signal; the probe turns electricity into sound and back; the calibration - reference reflectors of known size, or the probe’s own characteristics - is what converts an amplitude into a figure that can be compared with an acceptance level.

The four models in this range differ along those lines rather than in kind. All four share 500 inspection channel groups, colour displays with a language selection, and USB connection to a PC with the software supplied on a USB flash drive. What separates them is the sampling frequency, which runs from 150 MHz to 800 MHz, the scanning range, and whether traces are stored internally or on a removable disk.

Reading the echoes

The instrument times the interval between the transmitted pulse and each returning echo and converts it to a distance using the sound velocity of the material. That is why the velocity has to be set correctly and why the material’s own inconsistency on the KUT350 velocity range matters: for steel the figure is around 5920 m/s in longitudinal mode, and the same delay becomes a different distance in aluminium or in austenitic stainless steel.

Size is inferred rather than measured. The amplitude of an echo depends on the size of the reflector, on its orientation and on how far away it is, so an amplitude on its own says very little. The instrument draws a reference curve - DAC on this range - by recording echoes from known reflectors at several depths, and every subsequent echo is compared against that curve. What gets reported is therefore an equivalent size at a stated threshold, which is what the acceptance standard is written in terms of.

Probes and why they are not in the datasheet

The material specifies the instruments thoroughly and the probes not at all. The KUT350 packing list names one straight probe and one angle probe without giving frequency, crystal size or angle, and no probe specification appears anywhere else.

That is not a small omission, because the probe decides what can be found. A straight probe sends sound along its axis and finds laminations and defects parallel to the surface; an angle probe refracts the beam into the material and is what weld inspection is built around, since the defects of interest in a weld usually lie at an angle to the surface. Frequency trades penetration against resolution, and crystal size trades beam width against energy. Buying the instrument without settling the probes leaves the actual capability of the set undetermined, so the probes belong in the enquiry alongside the instrument.

The models, and where they differ

The KUT350 is the entry model with a touch screen, 150 MHz sampling and a scanning range to 10000 mm. The KY880S has the shortest scanning range at 6000 mm and is described for the largest share of routine industrial work. The KY990S moves to an upright format with U-disk storage and a wider operating temperature. The KY9901PLUS adds the highest sampling rate, the longest scanning range, the tightest linearity figures, and two functions the others do not have: surface correction and crack height measurement, which is what makes it the model for characterising a defect rather than only locating it.

Measurement limitations and selection considerations

The KUT350 carries four inconsistencies that the material states plainly, and all four are carried here rather than resolved. Sound velocity appears as three different ranges across the card and the detail table on the same page. Vertical linearity is given as 2 % on the card and 3 % in the table. The overall dimensions differ by a millimetre. And the minimum display figure of 15 mm in steel sits against a stated 3 mm thin-part capability, with no reconciliation of the two.

The material also carries its own disclaimers - the detail table states that its parameters are for reference only, and the packing list states that the contents may be adjusted. Those are read as instructions and the affected figures are put into information required rather than treated as specification.

The limitations that belong to the method are worth stating too. Sound has to enter the material, so the surface has to be smooth enough and a couplant has to bridge the gap. The beam has a width and a near field, so a defect smaller than the beam is sized by the beam, and a defect very close to the surface sits where the beam has not yet formed. Coarse-grained and austenitic material scatters the beam and raises the noise floor. All of these shape what can be claimed for a given job, and all of them are agreed in the inspection procedure rather than discovered at the instrument.

Ordering

The items that fix the answer are the material and grade; the defect being looked for and where in the section it lies; the section thickness range and a drawing of the joint; the acceptance standard and the level of acceptance; the surface condition at the time of inspection; whether stored traces and a written report are required, which decides between the models with removable storage and the ones without; and the probes, which are not specified in the material and have to be agreed separately, including the angles the standard calls for. If the standard is not yet fixed, send the joint drawing and the working conditions - a quotation can be issued against those and adjusted once the acceptance criteria are settled. Quantity, destination port and required delivery date complete the enquiry.

Features

  • Four models spanning 150 MHz to 800 MHz sampling, so the resolution can be matched to how small a defect has to be resolved
  • DAC and AVG reference curves, which is what turns an echo amplitude into a size that can be compared with an acceptance level
  • 500 inspection channel groups, so a shop working to several procedures can keep a setup per procedure rather than recalibrating each time
  • U-disk storage on the two upper models and 100 stored A-scan traces on the two lower ones
  • Single-crystal and dual-crystal probe modes selectable in the same instrument
  • A freeze function for holding a waveform while it is discussed or recorded
  • Surface correction and crack height measurement on the KY9901PLUS, for work where the depth of a crack has to be reported rather than only its position
  • USB connection to a PC with the software supplied on a USB flash drive, for transferring results and producing printed reports

Technical specifications

Every value below is taken from source documentation. Where a parameter is not stated in the available material it is marked as information required rather than estimated.

Instrument performance
Sampling frequency150 MHz on the KUT350, 200 MHz on the KY880S, 320 MHz on the KY990S and 800 MHz on the KY9901PLUSStandard
Scanning rangeKUT350 0 to 10000 mm, stated as 0 to 9999 mm with a 15 mm minimum display in its detail table; KY880S 0 to 6000 mm; KY990S 15 to 10000 mm; KY9901PLUS to 15000 mmStandard
Vertical linearity2 % or better on the KUT350 card figure, 3 % in its own detail table, and 1.5 % or better on the KY9901PLUSInformation required
Horizontal linearity0.2 % or better, stated for the KY9901PLUSStandard
Amplitude linearity±2 % or better on the KUT350Standard
Dynamic range32 dB or better, tested against the standard named in the material for the KUT350 and stated for the KY990SStandard
ResolutionAbove 40 dB on the KY880S and above 42 dB on the KY9901PLUS; not stated for the other two modelsInformation required
Sensitivity marginThe KUT350 card gives 62 dB or better and its detail table gives 65 dB or better against a stated 200 mm flat-bottom hole reference; both figures are carriedInformation required
Controls and signal handling
Gain0 to 120 dB with a 0.2 dB or 1 to 50 dB step on the KUT350; 0 to 110 dB on the KY880SStandard
Frequency rangeBroadband 0.5 to 20 MHz on the KUT350, 0.4 to 10 MHz on the KY880SStandard
Transmit voltage50 to 350 V, stated for the KUT350Standard
Pulse shift-7 to 9984 mm on the KUT350Standard
Probe zero0 to 200 µs on the KUT350Standard
Detection modeNegative half wave, positive half wave, full wave and radio frequencyStandard
FilterAn adaptive filter, described for the KUT350Standard
Suppression0 to 80 % in 1 % steps on the KUT350Standard
AlarmAudible and visual indication, described on the KUT350 as triggered by an incoming echoStandard
Attenuator accuracy20 dB ±1 dB, stated for the KUT350Standard
Interfaces and storage
Probe connectorQ9 to Q9, stated for the KUT350Standard
Channels500 inspection channel groups across the range, described as expandable on the KUT350Standard
Trace storage100 A-scan traces on the KUT350 and KY880SStandard
Removable storageU-disk storage on the KY990S and KY9901PLUSStandard
PC connectionUSB, with software supplied on a USB flash drive for transferring results, managing stored readings, statistics and printed reportsStandard
ReportingAutomatic report printing described across the range, and a freeze function for holding a waveformStandard
Physical
Dimensions246 × 155 × 55 mm on the KUT350 card and 245 × 155 × 55 mm in its detail table; 250 × 155 × 55 mm on the KY880S; 238 × 160 × 48 mm on the KY990S; 260 × 175 × 60 mm on the KY9901PLUSInformation required
WeightAbout 1.18 kg with battery on the KUT350; 1.3 kg on the KY990S; 1.2 kg on the KY9901PLUSStandard
Operating temperature-10 to 45 °C on the KUT350; -10 to 50 °C on the KY990S and KY9901PLUSStandard
DisplayColour screen with Chinese and English languages, described as high definition across the rangeStandard
SupplyNot stated in the material as a voltage or a cell typeInformation required
Ingress protectionNot stated in the materialInformation required

Available models

Selection table
Model Configuration Key ranges Availability
KUT350 Touch-screen A-scan instrument, 150 MHz sampling, DAC and AVG curves, 246 × 155 × 55 mm Scanning range 0 to 10000 mm; gain 0 to 120 dB; 500 channels; 100 stored A-scan traces; about 1.18 kg The entry model, described for routine inspection where extreme resolution is not required
KY880S A and B scan instrument, 200 MHz sampling, 250 × 155 × 55 mm Scanning range 0 to 6000 mm; gain 0 to 110 dB; resolution above 40 dB; 500 channels; 100 stored traces The shortest scanning range in the range, which makes it the model for plate and thinner section work
KY990S Upright format instrument with a colour screen, A and B scan and U-disk storage, 238 × 160 × 48 mm Scanning range 15 to 10000 mm; gain 0 to 120 dB; dynamic range 32 dB or better; 1.3 kg The model with removable storage and a wider operating temperature range
KY9901PLUS Instrument with surface correction and crack height measurement, 800 MHz sampling, 260 × 175 × 60 mm Scanning range to 15000 mm; sensitivity above 65 dB; resolution above 42 dB; vertical linearity 1.5 % or better; horizontal linearity 0.2 % or better; 1.2 kg The model for thin sections and for work where a defect has to be characterised rather than only located

Customization

  • The model, which fixes the sampling frequency, the scanning range, the linearity figures and whether removable storage is available
  • The probes, which are supplied separately and are not specified in the material: a straight probe and an angle probe are listed in the KUT350 packing list, and the sizes and frequencies are to be agreed
  • The working language on the display, which is selectable between Chinese and English
  • The reference blocks used for calibration, which the material does not list and which follow from the acceptance standard
  • The reporting route, either the U-disk storage of the upper models or the PC software supplied with the instrument

Certification and compliance

Certification documents not yet supplied

Certifications are only published once a certificate copy can be produced, so this section is deliberately empty rather than populated with assumed approvals. Tell us which approvals your application requires and we will confirm what is available for this instrument.

Parameters still to be confirmed

The following are required for a complete specification but are not stated in the documentation supplied to us. They are listed rather than estimated:

  • The sound velocity range of the KUT350, given as 1000 to 15000 m/s on the card, 100 to 20000 m/s in its detail table, and 100 to 20000 m/s again in the velocity row of the same table
  • The vertical linearity of the KUT350, given as 2 % or better on the card and 3 % in its detail table
  • The KUT350 dimensions, given as 246 × 155 × 55 mm on the card and 245 × 155 × 55 mm in its detail table
  • The relationship between the stated 3 mm thin-part capability and the 15 mm minimum display figure for steel at longitudinal wave
  • The sensitivity margin of the KUT350, given as 62 dB or better on the card and 65 dB in its detail table
  • The probe specifications: frequency, crystal size and angle, none of which the material states for the straight or angle probes
  • The supply voltage and battery type, which the material does not state
  • Ingress protection for all four models
  • Repeatability, which is not stated
  • The standards the instruments are built to, beyond the standard named against the dynamic range test
  • Whether a calibration certificate traceable to a national standard is available
  • The reference blocks required for calibration, which the material does not list
  • Warranty period and the terms that apply
  • An English-language datasheet and the full specification for each model

Frequently asked questions

How do I choose between the four models?

By how small a defect has to be resolved and how thick the section is. Sampling frequency is the figure that decides the first: 150 MHz on the KUT350, rising to 800 MHz on the KY9901PLUS, and a higher sampling rate is what keeps closely spaced echoes separate. Scanning range decides the second, though the relationship is not simply larger is better - the KY880S covers 0 to 6000 mm and is described for the most common industrial work, while the KY9901PLUS extends to 15000 mm and adds surface correction and crack height measurement. Where a defect only has to be located, the lower two models do that; where it has to be characterised, the upper ones are the ones to look at.

What is the difference between DAC and AVG?

Both are ways of turning an echo amplitude into a size that can be compared with an acceptance level, and they differ in how the reference is arrived at. A distance-amplitude curve is built by recording the echo from a series of known reflectors at different depths and drawing the envelope through them, so the comparison is made against measurements taken on reference blocks. An amplitude-velocity-gain curve is computed from the probe and material characteristics instead. The practical difference is in what has to be available at the time: a set of reference blocks, or the probe data. The KUT350 is stated to have both.

Can it measure the thickness of thin material as well as find defects?

The material states a 3 mm thin-part capability across the range, and separately gives the KUT350 a minimum display of 15 mm in steel at longitudinal wave. Those two figures are not the same measurement - one describes detecting a defect in a thin wall, the other the resolution of the distance scale - and the material itself does not reconcile them. That reconciliation is listed under information required. Where wall thickness itself is the measurement, a thickness gauge is the instrument for it; a flaw detector reads the return signal for discontinuities rather than reporting a remaining wall.

What has to be confirmed before a quotation?

The material and grade, and whether it is coarse-grained or austenitic, because that changes the probe, the frequency and what can be expected. The defect being looked for and where in the section it is expected to lie. The section thickness range and a drawing of the joint. The acceptance standard and the level of acceptance, since that fixes the reference blocks, the probe angles and the reporting thresholds. The surface condition at the time of inspection. And whether stored traces and a written report are required, which is what decides between the models with U-disk storage and the ones without. The probes themselves are not specified in the material and have to be agreed separately.

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