Non-Destructive Testing Equipment · Ultrasonic Thickness Gauges

Portable Ultrasonic Thickness Gauge

Portable ultrasonic thickness gauge covering 0.8 to 600 mm, with through-coating, ultra-thin and electromagnetic variants down to 0.15 mm and 0.001 mm resolution.

JITAI-510 (4 models) ·

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Key specifications

Model
JITAI-510 / JITAI-515 / JITAI-512 / JITAI-514
Measuring range
0.8 to 600 mm on the JITAI-510 depending on probe; 1 to 300 mm for the through-coating model; 0.15 to 300 mm on the ultra-thin model; 0.75 to 160 mm on the electromagnetic model
Resolution
0.01 mm on the JITAI-510, 515 and 514; 0.001 mm on the JITAI-512
Accuracy
±0.05 mm between 0.8 and 10 mm and ±(0.01 + H/200) mm above 10 mm on the JITAI-510, where H is the measured thickness
Sound velocity
1000 to 9999 m/s, set by material
Display
128 × 64 LCD with a high-brightness EL backlight
Measuring mode
Pulse to first echo, described as R-B1, with single-point and two-point calibration against a 4 mm block
Supply and runtime
Two AA cells, stated as over 30 hours of operation
Storage
40 thickness readings and 40 parameter sets on the JITAI-510
Working temperature
-20 to 40 °C on the JITAI-510

An ultrasonic thickness gauge answers a question that nothing else answers cheaply: how much metal is left. Pipe, tube, pressure vessels and plate are measured for wall loss from one side only, with the instrument on the outside and no need to open, cut or drain anything.

It is also one of the easiest measurements to get wrong in a way that looks right, because the number on the display depends on a velocity the operator set and on an echo that has to be the back wall rather than something in front of it.

What the instrument is

A probe and a body. The probe sends a pulse into the material, listens for the return from the far face, and the body times the interval and multiplies it by the sound velocity set for the material. Everything else - the display, the storage, the calibration - serves that arithmetic.

The range in this material is four instruments rather than four versions of one. The JITAI-510 is the general instrument. The JITAI-515 measures through a coating. The JITAI-512 is built for thin sections. The JITAI-514 is electromagnetic and needs no couplant at all. They share a probe family and a measurement principle and differ in what they can be pointed at.

Setting the velocity

The instrument measures a time, not a thickness, so the velocity is the conversion factor and getting it wrong scales the whole result. Steel is around 5920 m/s and aluminium around 6340 m/s, so a velocity left set for steel while measuring aluminium reads several percent low, and the error grows with the thickness.

Two things follow. First, the instrument’s velocity function - deriving the velocity from a sample of known thickness - is the reliable way to set it on an unfamiliar material, and it is worth having. Second, the table of velocities for 24 materials that comes with the instrument is described in the material itself as approximate, which is how it should be treated: as a starting point to be confirmed on a sample rather than a setting to be dialled in and trusted.

Probes, and the two reasons they change

The probe has to get sound into the material and the echo back out, and two properties of the work decide which probe does that.

The first is the material’s structure. Cast iron and other coarse-grain material scatter the beam, so the probes quoted for it are lower frequency and larger diameter - which is why the two N02 probes carry a separate, much shorter range for grey cast iron alongside their steel range. A probe that works well on rolled steel will under-read or fail entirely on cast iron.

The second is geometry. Thin walls and small radii need a small-diameter high-frequency probe, which is what the microcrystal types are for; the material gives minimum diameters and minimum wall thicknesses for each. Surfaces below 300 °C need the high-temperature probe.

Measuring through a coating

A painted or coated surface presents the standard instrument with an extra echo, and the coating echo arrives before the back-wall echo. Taking it for the back wall reports the coating thickness rather than the metal, and the reading looks entirely plausible.

The two models that answer this do it differently. The JITAI-515 uses an echo-echo mode that suppresses the coating return and times the first back wall, which is why its stated echo-echo range is far shorter than its pulse-echo range. The JITAI-514 avoids the problem by not needing a couplant at all: it is electromagnetic, measures with lift-off, and reads through the coating. Choosing between them is a question about the coating, the surface and whether anything can be applied to it.

Measurement limitations and selection considerations

The material carries several inconsistencies and all are recorded rather than resolved. The JITAI-510 range is given as 1 to 600 mm on the configuration card and 0.8 to 600 mm in the specification table; the dimensions differ between the table and two of the cards; the runtime is written two ways; and every probe frequency is printed as mHz where MHz is plainly meant.

The last of those is worth naming because it is not a judgement call: a 2 mHz probe would be inaudible and unusable, so the unit in the material is a typographical error. It is recorded as printed and read as MHz, with the discrepancy listed so that no one has to make that decision twice.

The limits that belong to the method are the ones to design around. The instrument needs a far face for the echo to come back from, so it cannot measure a coating thickness, and it cannot see a lamination inside the wall in its normal mode. It needs a couplant on the piezo-electric models, which rules out surfaces that cannot be wetted or that are too hot for the couplant supplied. And it needs the material to be uniform enough for a single velocity to apply, which is where coarse-grain material, laminates and dissimilar joints raise questions that the instrument cannot answer on its own.

Ordering

The items that fix the answer are the material and whether it is coarse-grained; the thickness range including the thinnest section; whether the surface is painted, coated or lined, which decides between a standard instrument and one of the two through-coating variants; whether a couplant can be applied; the surface temperature; the geometry, including the smallest radius and the smallest diameter to be measured; whether readings must be stored and reported; and the quantity of points to be measured per inspection. Where the material’s own figures conflict, the enquiry is the place to settle them - the range, the dimensions and the probe frequencies are all quoted two ways in the material behind this page. Quantity, destination port and required delivery date complete the enquiry.

Features

  • A range that covers general wall measurement, through-coating work, ultra-thin sections and a couplant-free electromagnetic variant, so the instrument can follow the duty rather than the other way round
  • Six probe options for one instrument, including coarse-grain probes for cast iron, microcrystal probes for thin walls and small radii, and a probe rated for surfaces below 300 °C
  • Through-coating measurement on the JITAI-515, which reads the metal beneath a paint or coating layer rather than the coating itself
  • A lower limit of 0.15 mm and a resolution of 0.001 mm on the JITAI-512, for thin tube and foil
  • No couplant at all on the JITAI-514, which measures with lift-off and can be connected to a phone
  • A velocity function that derives the sound velocity of an unknown material from a sample of known thickness
  • Single-point and two-point calibration against a supplied reference block
  • Storage of 40 readings and 40 parameter sets on the JITAI-510, with metric and imperial units selectable

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.

Measurement
Measuring range0.8 to 600 mm on the JITAI-510 depending on the probe fitted; the configuration card gives 1 to 600 mm for the standard probe and 0.8 to 80.0 mm for the microcrystal probe, while the specification table gives 0.8 to 600 mmInformation required
Resolution0.01 mm across the JITAI-510, 515 and 514; 0.001 mm on the JITAI-512Standard
Accuracy±0.05 mm from 0.8 to 10 mm, and ±(0.01 + H/200) mm above 10 mm, where H is the thickness measuredStandard
Sound velocity1000 to 9999 m/s, with a function that derives the velocity from a sample of known thicknessStandard
Measuring cycleSix readings per second in single-point modeStandard
CalibrationA 4 mm reference block, with a single-point or a two-point procedureStandard
UnitsMetric and imperial, selectableStandard
Variants
JITAI-510The general instrument, supplied with either a standard probe or a microcrystal probeStandard
JITAI-515Through-coating model, stated to measure through a coating with the pulse-echo mode reading 1 to 300 mm in steel and the echo-echo mode reading 4 to 25 mm in steelStandard
JITAI-512Ultra-thin model with a stated lower limit of 0.15 mm, a resolution of 0.001 mm and 360° measurementStandard
JITAI-514Electromagnetic model requiring no couplant, described as measuring with lift-off, through a coating, and connectable to a phone; 0.75 to 160 mmStandard
Probe suppliedA 5 MHz, 10 mm diameter standard probe on the JITAI-510, and a through-coating probe on the JITAI-515Standard
Probes
N02 coarse grain2 MHz, 12 mm diameter, for cast iron and other coarse-grain material; 3.0 to 600.0 mm in steel and up to 40 mm in grey cast ironStandard
N02 long range2 MHz, 20 mm diameter, the same application with a longer range; 3.0 to 600.0 mm in steel and up to 100 mm in grey cast ironStandard
N05/90° standard5 MHz at 90°, 10 mm diameter; 1.0 to 600.0 mm in steelStandard
N07 microcrystal7 MHz, 6 mm diameter, for thin walls and small curved surfaces; 0.8 to 80.0 mm in steelStandard
N010 microcrystal10 MHz, 4 mm diameter, for thin walls and small radii; 1.2 to 10 mm in steelStandard
HT5 high temperature2 MHz, 14 mm diameter, for surfaces below 300 °C; 3 to 200 mm in steelStandard
Frequency notationThe material prints every probe frequency as mHz where MHz is meant; recorded as printed and read as MHzInformation required
Instrument
Display128 × 64 liquid crystal display with a high-brightness EL backlightStandard
Storage40 thickness readings and 40 parameter sets on the JITAI-510Standard
SupplyTwo AA cells, stated as over 30 hours of operation in one place and 30 hours or more in anotherInformation required
Dimensions155 × 75 × 32 mm in the specification table, and 145 × 74 × 32 mm on the configuration cards for the standard-probe JITAI-510 and the JITAI-515Information required
WeightAbout 245 g including cells on the JITAI-510Standard
Working temperature-20 to 40 °C on the JITAI-510; not stated for the other modelsInformation required
Ingress protectionNot stated in the materialInformation required
Supplied with
Packing listInstrument, probe, couplant, two cells, documentation, and a carrying case; the JITAI-514 additionally lists a room-temperature probe, a charging cable, a charger, iron-based and aluminium-based reference blocksStandard
Reference blockA 4 mm block is described for calibration on the JITAI-510; the JITAI-514 lists two substrate blocksStandard
CouplantSupplied with the piezo-electric models; not required by the electromagnetic JITAI-514Standard
Sound velocity referenceA table of velocities for 24 materials is supplied, described as approximate values for referenceStandard

Available models

Selection table
Model Configuration Key ranges Availability
JITAI-510 General instrument with a 128 × 64 backlit display, supplied with a standard or a microcrystal probe 0.8 to 600 mm depending on probe; 0.01 mm resolution; ±0.05 mm to 10 mm; two AA cells; about 245 g The default choice for pipe, plate and formed-part wall measurement
JITAI-515 Through-coating instrument measuring through a paint or coating layer Pulse-echo mode 1 to 300 mm in steel; echo-echo mode 4 to 25 mm in steel; 0.01 mm resolution The form for painted, coated or lined work, where a standard probe would read the layer rather than the metal
JITAI-512 Ultra-thin instrument described as using an imported chip 0.15 to 300 mm; 0.001 mm resolution; 360° measurement The form for thin tube, sheet and foil, where the general instruments run out of resolution
JITAI-514 Pen-type electromagnetic instrument requiring no couplant 0.75 to 160 mm; no couplant; lift-off measurement; through coating; phone connection The form for surfaces a couplant cannot be applied to, or where the surface is too hot, too rough or coated to couple

Customization

  • The probe, from six options covering coarse-grain material, standard work, thin walls, small radii and surfaces below 300 °C
  • The instrument variant, which follows from the duty: general, through-coating, ultra-thin or couplant-free
  • The reference block and substrate blocks, which are listed with the packing for the models that use them
  • Whether metric or imperial display is required

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 JITAI-510 measuring range, given as 1 to 600 mm for the standard probe on the configuration card and 0.8 to 600 mm in the specification table
  • The product dimensions, given as 155 × 75 × 32 mm in the specification table and 145 × 74 × 32 mm on two configuration cards
  • The probe frequencies, printed throughout as mHz where MHz is intended
  • The runtime figure, given as over 30 hours in one place and 30 hours or more in another
  • The minimum diameter notation for the probes, printed in two different forms
  • The probe supplied with the JITAI-512 and the JITAI-514, since the JITAI-514 lists its probe as an option
  • The supply voltage and cell type for the JITAI-512, 515 and 514, which are not stated individually
  • Ingress protection for all four models
  • The working temperature range for the JITAI-512, 515 and 514
  • Whether the reference block is traceable to a national standard
  • The thickness of the coating the JITAI-515 and JITAI-514 can measure through, which the material does not state
  • Repeatability, which is not stated
  • For the JITAI-514, the phone application platform and what the connection provides
  • Warranty period and the terms that apply
  • An English-language datasheet and the full specification for each model

Frequently asked questions

Why is the sound velocity setting so important?

Because the instrument does not measure a thickness directly - it measures a time and multiplies it by a velocity. Steel is around 5920 m/s and aluminium around 6340 m/s, so a velocity left set for steel while measuring aluminium gives a reading several percent low, and the error grows with the thickness. The instrument has a function that derives the velocity from a sample of known thickness, which is the reliable way to set it on an unfamiliar material. The material also supplies a table of velocities for 24 materials, but it describes those as approximate values, and that is the right way to treat them.

How do I measure a painted or coated pipe?

Two ways, and the difference matters. The JITAI-515 is built for it, using an echo-echo mode that ignores the coating echo and times the first back-wall return, which is why its echo-echo range is stated as 4 to 25 mm in steel rather than the full range. The JITAI-514 takes a different route entirely: it is electromagnetic, needs no couplant, and measures through a coating with lift-off. Where a coating is thin and well bonded, a standard instrument can sometimes be read with care, but the echo from the coating surface will be there and can be mistaken for the back wall - which is the failure mode these two models exist to remove.

Which probe do I need?

It follows from the material and the geometry. Cast iron and other coarse-grain material scatter sound, so they need a lower-frequency coarse-grain probe; that is why the N02 probes are quoted with separate ranges for steel and for grey cast iron. Thin walls and small radii need a small-diameter high-frequency probe, which is what the microcrystal N07 and N010 are for. Surfaces below 300 °C need the high-temperature probe. Everything else is covered by the standard probe. The material gives the minimum diameter and the range for each, and those figures are the ones to match against the part.

What has to be confirmed before a quotation?

The material, and whether it is coarse-grained such as cast iron, because that decides the probe frequency and the range that can be expected. The thickness range to be covered, including the thinnest section. Whether the surface is painted, coated or lined, since that decides between a standard instrument and one of the two through-coating variants. Whether a couplant can be applied, since the electromagnetic model is the answer where it cannot. The temperature at the surface. Whether readings have to be stored and reported. And the geometry, including the smallest radius and the smallest diameter, which decides the probe.

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