TRIPLETT UTG300 Ultrasonic Thickness Gauge User Manual

UTG300 Ultrasonic Thickness Gauge

User Manual
UTG300
Ultrasonic Thickness Gauge

1. Overview
Congratulations on your purchase of the Triplett UTG300 Ultrasonic Thickness Gauge. This product is an intelligent ultrasonic thickness gauge that adopts the latest high performance and low power consumption microprocessor technology. Based on the principle of ultrasonic measurement, it can measure the thickness and sound speed of metal and other materials. It can detect the thinning of pipes and pressure vessels after corrosion, and can make accurate measurements of plates and machined parts. The gauge can be widely used in petroleum, chemical, metallurgy, shipbuilding, aviation, aerospace and other fields.
1.1 Operating Principle
When measuring the thickness, the ultrasonic pulse is generated by the probe to reach the measured body through the coupling agent. Part of the ultrasonic signal is reflected from the bottom of the object, and the probe receives the reflected echo. The gauge calculates the round trip time of the ultrasonic wave and the thickness value according to the following formula, and then displays the calculated results.
In the formula: H-Measured thickness; V-Material sound velocity; t-Round trip time of ultrasonic wave in specimen
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1.2 Specifications

Display Language Measurement range Sound velocity range
Unit
Accuracy
Lower limit of pipe measurement
Data storage
Main functions
Battery Charging specification Operating time (full battery) Operating temperature and humidity Storage temperature and humidity
Product size

2.4″ monochrome dot matrix screen English/Chinese 1.00~300.00mm
(10009999) m/s 0.1mm/0.01mm/0.01in H<10mm, ±0.1mm, H is the actual
thickness; H10mm, ±(1%H+0.1)mm

20×3mm (steel) 300 groups, including material, sound velocity, unit, measured value, MAX,
MIN and AVG of each group Single measurement, continuous measurement, alarm, sound velocity measurement, auto calibration Built-in 3.7V 2000mAh lithium battery
DC5V 1A, Type-C interface About 16h
0~40 10%RH~80%RH -10~50 10%RH~70%RH
140×66×28.5mm

Note: 1) Oil coupling agent cannot be used for the standard probe, otherwise the probe will be damaged. After using the probe, please wipe the residual coupling agent on it to extend its service life. 2) Please avoid using the product in oily environment as far as possible. If unavoidable, minimize the contact time with oily substances, and wipe the probe
surface with oil-absorbing paper after use.

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2. Structure and Appearance

Product features

4

5

3

Single

20.00 mm

Mat

Steel

Max

Min

2

Avg
ULTRASON IC THICKN ESS GAUGE

5920 mm mm mm

Mode

m/s

Menu

Cal

Rec Enter

1

Back Alarm

6

7

1. Outer shell

2. Buttons

3. Display

4. Transmitting socket 5. Receiving socket 6. Standard thickness block

7. Probe

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2.1 Main Interface

After the gauge is turned on, it will automatically enter

the main interface, as shown below:

2
1

5 4

Scan

4.42 mm

6

Mat

Custom

5920

Max

4.50mm

3

Min

4.42mm

Avg

4.43mm

3. Battery Charging and Maintenance
The product is equipped with a non-removable 3.7V 2000mAh lithium battery. When the product cannot be turned on or the battery is empty, please charge it in time. Charge the product with a DC5V adapter larger than 1A and the charging interface is Type-C. When charging, the battery icon scrolls . When fully charged, the battery icon becomes full .
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Note: When not in use for a long time, the product should be fully charged and recharged every six months to avoid battery damage.
4. General Measurement Process
5. Preparation 5.1 Treatment of Measured Workpiece Surface If the measured object surface is rough or seriously rusted, please use the following methods: Use coupling agent on the measured object surface Use rust remover, wire brush or sandpaper to treat the surface Multiple measurements near the same point
6. Operation 6.1 Power On/Off Insert the probe into the gauge and short press to power on.Long press to power off.
Auto power off: The product will shut down automatically when there is no operation. The default time is 5 minutes. Users can select the auto power off time, refer to 6.18 Power Off. Force shutdown: Long press the Power button for more than 10s.
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6.2 Single Measurement Evenly smear the coupling agent on the area to be measured. Tightly couple the probe to the material surface, and the thickness of the measured area will show on the screen. When the probe is well coupled to the material, the screen will display the coupling symbol
. If the coupling symbol flickers or there is no coupling symbol, it indicates that the coupling condition is bad and the coupling agent needs to be added. After the probe is removed, the coupling symbol disappears and the thickness value remains. Figure 1 Add the coupling agent
Figure 2 Evenly smear the coupling agent and tightly couple the probe to the material surface.
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6.3 Continuous Measurement
Evenly smear the coupling agent on the area to be measured and couple the probe to the material surface. Move the probe along the surface. The gauge will display the current measured value, MAX, MIN and AVG in real time. 6.4 Alarm Users can monitor the unqualified materials with the alarm function. Long press to turn on/off the alarm. If is displayed on the screen, the alarm is turned on. If is displayed on the screen, the alarm is turned off. For example: Standard value: 4.00mm, limit: ±0.1mm. When the measured thickness is less than 3.90mm or greater than 4.10mm, the gauge will give an alarm sound, indicating that the thickness is not qualified. Users can press any button to exit the alarm, or continue measuring.
6.5 Calibration
Note: Calibration should be carried out when the probe is replaced, the ambient temperature changes greatly or the measurement deviation occurs.
Calibrate the gauge if it is used for the first time or not used for a long time. Calibration must be done using the standard thickness block. After calibration, the material automatically changes to steel, and the sound velocity changes to 5920m/s (0.233in/us).
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Calibration steps:

1. Long press to enter the calibration mode. “Please Calibrate” will show on the screen. 2) Refer to Figure 1 and Figure 2 in 6.2 Single Measurement to evenly smear the coupling agent on the surface of the standard thickness block. Press the probe on the coupling agent to make it tightly contact with the block surface. (Note: the coupling agent should not be too thick. Otherwise the gauge will count the thickness of the coupling agent, resulting in calibration errors). 3) Press to save the calibration data. (Note: Before pressing , the value displayed might not be 4mm. When the value is stable, press . After calibration, the displayed value should be within the range of 4±0.04mm, otherwise recalibrate).
   6.6 Sound Velocity Measurement
   Different materials have different sound velocities. The materials and velocities listed in Appendix A are for r eference only.This function is used to measure the sound velocities of materials. The steps are as follows:

2. First calibrate the gauge.

3. Use a caliper to measure the thickness of the workpiece.

4. Use the gauge to measure the thickness of the workpiece.
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5. Press or to make the thickness measured by the gauge the same as the value measured by the caliper. 5) Press to calculate the workpiece sound velocity.

6. At this point, the correct sound velocity can be obtained, and the correct thickness can be obtained by measuring the same material with the sound velocity.
   Note: The thickness adjustment range is ±20mm (±0.79in) (for customized materials, ±250mm (±9.84in)). The upper limit is 300mm, and the lower limit is 1mm. In case of misoperation, users can refer to 6.7 Sound Velocity Selection.
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6.7 Sound Velocity Selection
Users can select the sound velocity according to the material. When the current unit is mm, the unit of sound velocity is m/s. When the unit is in, the unit of sound velocity is in/us. In the main interface, short press to select the material. The gauge has three types of custom materials. If users do not know which material to select, they can select the custom materials and then measure the sound velocity of the material, refer to 6.6 Sound Velocity Measurement. Material selection interface

MAT

1. Press to step through the

options upwards.

Steel
Stainless Brass

5920 5740

Press to step through the

4399 options downwards.

Copper Iron

4720 3) Press to confirm the selected 5930 material and enter the sound velocity

Cast iron

5110 adjustment interface.

Plumbum

2400 4)

Press to return to the main

interface.

Sound velocity adjustment interface

SPD
Adjust range 5720 – 6120

1. Press to add the value. Long press it to scroll up. 2) Press to subtract the value. Long press it to scroll down.

5920m/s

3. Press to confirm the sound velocity and return to the main interface. 4) Press to return to the material selection interface.
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6.8 Clear Measured Results In the single and continuous measurement interfaces, short press to clear the current measured results (including MAX, MIN and AVG). In the continuous measurement mode, the results can only be cleared after the probe is removed. 6.9 Data Storage In the single and continuous measurement interfaces, long press to save records. Each record includes the current measured value, MAX, MIN, AVG and material sound velocity. A maximum of 300 groups of data can be stored. To view and delete records, refer to 6.14 Records. In the continuous measurement mode, the data can only be saved after the probe is removed to avoid storing unstable data.
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6.10 Menu
Long press to enter the menu. The options include Material, Speed, Unit, Records, Setting, About and Reset.

Menu
Material Speed
Unit Records Setting
About Reset

1. Press to step through the options upwards. 2) Press to step through the options downwards. 3) Press to enter the interface of the selected option.
2. Press to exit the menu and return to the main interface.

6.11 Material In the material selection interface:

MAT
Custom 1 Custom 2 Custom 3 Aluminum Steel Stainless Brass

1. Press to step through the
   materials upwards
2. Press to step through the materials downwards.
   6370 3) Press to confirm the selected 5920 material and return to the menu.
   5740
   4399 4) Press to return to the menu.

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6.12 Speed
The default value is ±200m/s (0.008in/us). The adjustment range of custom materials is 1000m/s to 9999m/s (0.039in/us to 0.394in/us).

SPD
5920m/s

1. Press to add the value. Long press it to scroll up.
2. Press to subtract the value. Long press it to scroll down. 3) Press to save and return to the menu.
3. Press to return to the menu.

6.13 Unit
In the unit selection interface:

Unit
0.1mm 0.01mm 0.01in

1. Press to step through the units upwards.
2. Press to step through the units downwards. 3) Press to save and return to the menu.
3. Press to return to the menu.

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6.14 Records In the menu, select “Records” and press to enter the

records interface. When there is no record, the screen

will display “No records”, and the gauge cannot enter

the records interface.

Records
first page last page selected item Delete the item Delete all

1. Press to step through the options upwards.
2. Press to step through the options downwards. 3) Press to enter the interface of

the selected option.

4. Press to return to the menu.
   6.14.1 First Page
   Select “First page” and the screen will display the records from the first page. The number and value of each record will also be displayed.

Records

1

4.50mm

2

4.44mm

3

4.42mm

1. Press 2) Press

to page up. to page down

3. Press

to select a record.

4. Press to return to the records interface.

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When a record is selected, press or to step

through the records upwards or downwards.

Short press

to view the detailed information of

the selected record (NO., measured value, MAX, MIN

and AVG). Short press to return to the record list.

Records

001
4.50 mm

Mat Custom1 Max Min Avg

5920 4.50mm 4.50mm 4.50mm

When viewing a record, users can long press to delete this record. Press or to view the previous or next record.
6.14.2 Last Page Select “Last page” and the screen will display the records from the last page. The number and value of each record will also be displayed, refer to 6.14.1 First Page.
6.14.3 Selected Item
In the records interface, select “Selected item” to choose a record to be viewed. The screen will display the record list starting from the page where the selected record is located. The number and value of each record will also be displayed.
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Select group

1. Press or to adjust the record number.

Select group From 001 to 009 001

2. Press to confirm the adjusted digit (tens digit/tens digit/ units digit). After the units digit is confirmed, it

will enter the page where the

selected record is located.

3. Press to return to the records interface. 6.14.4 Delete the Item

In the records interface, select “Delete the item” to

choose the record to be deleted.

Del Group
group range 001-009 From 001to001

1. Press or to adjust the record number. 2) Press to confirm the adjusted digit (tens digit/tens digit /units digit). After the units digit is confirmed, a prompt will pop up. 3) Press to return to the

records interface.

When the prompt pops up, users can press or to select Yes/No, and then press to delete or not.

Press to return to the previous interface.

Del
Delete 001-001 Yes No
Deleting records takes a while. -16-

6.14.5 Delete All In the records interface, select “Delete all” to delete all records. Press or to select Yes/No, and then press to delete or not. Press to return to the records interface.
Del Do you confirm to Delete all Saved
data? Yes No

6.15 Setting In the setting interface:

Setting
Sound Back light Power off
Alarm Language

1. Press to step through the options upwards.

2. Press to step through the options downwards.

3. Press to enter the interface of the selected option.

4. Press to return to the menu.

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6.16 Sound In the sound interface:

sound ON OFF

1. Press or to select ON/OFF. 2) Press to save.
2. Press to return to the setting interface.

6.17 Backlight

In the backlight interface:

Backlight Time 180S

1. Press time.
2. Press time. 3) Press

to add the backlight to subtract the backlight to confirm.

4. Press interface.
   6.18 Power Off In the power off interface:

to return to the setting

Shut Time 300S

1. Press to add the power off time.
2. Press to subtract the power off time.
3. Press to confirm.
4. Pressto return to the setting interface.
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6.19 Alarm

In the alarm interface, first adjust the standard value, and then adjust the limit. Long press or to quickly

adjust the value.

1. Press to add the

Alarm

standard/limit.

Standard 4.00mm

2. Press to subtract the standard/limit.

Limit ±0.01mm 3) Press to confirm.

6.20 Language

4. Press to return to the setting interface.

In the language interface:

Language Chinese English

1. Press to step through the options upwards. 2) Press to step through the options downwards.
2. Press to save. 4) Press to return to the setting interface.

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6.21 About
Press to return to the setting interface in the about interface. The content will be updated later. The actual situation

prevails.

About

ID: UTG China VersionV.202204

6.22 Reset In the reset interface:

Reset
Do you need to restore Factory
settings ? Yes NO

1. Press 2) Press

or to select Yes/No. to confirm.

3. Press to return to the setting interface.

7. Measurement Applications
7.1 Measurement Modes Single point measurement: Use the probe to measure any point of the measured object. The displayed value is the thickness.
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Two-point measurement: Use the probe to measure the same point of the measured object twice. The probe parting plane is 90°, and the smaller value is the thickness. Multi-point measurement: Multiple measurements are made in a circle with a diameter of about 30mm, and the minimum value is the thickness. Continuous measurement: Continuously measure along a specified route with the single point method. The distance between each point is not less than 5mm, and the minimum value is the thickness. 7.2 Tube Wall Measurement The probe split surface can measure along the axis of the pipe or the axis of the vertical pipe. If the pipe diameter is large, the measurement should be in the direction of the vertical axis. When the pipe diameter is small, it should be measured in both directions, and take the minimum value as the thickness.
8. Maintenance and Cautions
8.1 General Cautions The gauge and probe should be avoided from strong vibration. Do not place the gauge in a damp environment.
Do not rotate the probe when inserting or
removing it to avoid damaging the cable core.
The attachment of oil and dust will make the probe
cable gradually aging and fracture. After use, the dirt on
the cable should be removed.
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8.2 Cautions during Measurement Good measurements are made only when stable coupling symbol appears; When there is a large amount of coupling agent on the object surface, it will cause mismeasurement. Therefore, at the end of the measurement, the probe should be quickly removed from the surface.
The probe surface is acrylic resin and should be gently pressed when used. When measuring rough surface, try to reduce the probe scratching on it. When measuring at room temperature, the surface of the measured object should not exceed 60, otherwise the probe can no longer be used. If the probe wears, the indicating value will be
unstable. Please replace it.
8.3 Clean the Standard Thickness Block The standard thickness block should avoid rust. Wipe the block after use, and don’t come into contact with sweat. If not used for a long time, a little grease should be coated on the surface of the block, and the grease can be wiped after the next use.
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8.4 Clean the Outer Shell Alcohol and diluent have corrosive effect on the casing, so wipe it gently with a wet cloth. 8.5 Repair
When there are problems with the gauge (such as inability to measure, abnormal LCD display, large error and button operation failure or confusion), please do not disassemble or adjust any parts, and contact after-sales.
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Appendix A Material Sound Velocity
Note: The sound velocities listed are approximate and are for reference only.

Material
User define 1 User define 2 User define 3
Aluminum Steel, common Steel, stainless
Brass Copper
Iron Cast Iron
Lead Nylon Silver
Gold Zinc Titanium Tin Acrylic resin Epoxy resin Ice Nickel Plexiglass Porcelain PVC Quartz glass Rubber, vulcanized

Sound velocity

in/µ s

m/s

0.233

5920

0.233

5920

0.233

5920

0.250 0.233 0.226 0.173 0.186 0.233 0.173-0.229 0.094 0.105 0.142

6340-6400 5920 5740 4399 4720 5930
44005820 2400 2680 3607

0.128

3251

0.164

4170

0.236

5990

0.117

2960

0.109

2760

0.100

2540

0.157

3988

0.222

5639

0.106

2692

0.230

5842

0.094

2388

0.222

5639

0.091

2311

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Appendix B FAQ and Solutions
B.1 Influence of Surface Conditions on Measurement Results B.1.1 Surface Coverings
Before measurement, remove dust, dirt, rust, paint and other coverings on the object surface. B.1.2 Rough Surfaces
Too rough surface can cause error, or even no reading. The material surface should be as smooth as possible. Grinding, polishing, filing and other methods are helpful, and a high-viscosity coupling agent can also be used. B.1.3 Roughwrought Surfaces
Regular grooves created by roughwrought surfaces (such as lathes or machines) can also cause errors, as described above. In addition, adjust the angle between the probe partition board (through the bottom center of the probe metal thin layer) and the measured material groove, so that the partition board and the groove are vertical or parallel to each other. Take the minimum value as the thickness.
B.1.4 Cylindrical Surfaces When measuring cylindrical materials, such as pipes, oil drums, etc., it is very important to correctly choose the included angle between the probe partition board and the axis of the measured material. The probe is coupled with the measured material, and the probe partition board is parallel or perpendicular to the material axis. Slowly shake the probe vertically along the axis, and the reading on the screen will change regularly. Take the minimum value as the thickness.
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Select the angle between the probe partition board and the axis according to the curvature of the material. For pipe with large diameter, the probe partition board is perpendicular to the pipe axis. For pipe with small diameter, the probe partition board is perpendicular or parallel to the pipe axis. Take the minimum value as the thickness. B.1.5 Composite Shapes The method described above can be used when measuring materials with composite shapes (such as pipe elbows). The difference is that two measurements are made, reading the probe partition and axis perpendicular and parallel values respectively. Take the smaller value as the thickness.
B.1.6 Unparallel Surfaces To obtain a stable and reliable value, the other surface of the material must be parallel or coaxial to the measured surface. B.2 Influence of Temperature on Measurement Results The thickness and the velocity of ultrasonic wave in the material are affected by temperature. When higher accuracy is needed, the blocks with the same material and approximate thickness can be measured under the same temperature. The temperature compensation coefficient can be obtained, and the measured value of the workpiece can be corrected with this coefficient.
B.3 Influence of Material Attenuation on
Measurement Results
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Fiber, porous, coarse crystal materials will cause a lot of ultrasonic scattering and energy attenuation, so that the gauge may have abnormal reading or no reading (abnormal reading is usually less than the actual thickness). In this case, the material is not suitable for measurement with this gauge.
B.4 Reference Blocks
The closer the material of the calibrated block is to the measured material, the more accurate the measurement will be. An ideal reference block would be a set of blocks of different thicknesses of the measured material, which would provide instrumental compensatory correction factors (such as material microstructure, heat treatment conditions, particle orientation, surface roughness, etc.). In most cases, satisfactory measurement accuracy can be obtained by using only one reference block. The block shall be of the same material and of a similar thickness as the measured material. The uniform material can be used as a block after measuring with a micrometer. For thin materials, a block may be used to determine the exact lower limit when its thickness approaches the lower limit measured by the probe. Do not measure material below the lower limit of thickness. If the thickness range is estimable, the thickness of the block shall be the upper limit. When the material to be tested is thick, especially the alloy with a complex internal structure, one of the blocks close to the measured material should be selected to facilitate calibration. The internal structure of most forgings and castings is
directional. The sound velocity will vary in different
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directions. To solve this problem, the test block should have an internal structure in the same direction as the measured material, and sound waves should travel in the same direction in the test block as in the material. In certain cases, the reference block can be replaced by the sound velocity table of the known material. But this is only approximating the substitution of some reference blocks. In some cases, the values in the sound velocity table differ from the actual measurements because of differences in the physical and chemical conditions of the material. This method is often used to measure mild steel, but only as a rough measurement. This gauge has the function of measuring the sound velocity, so it can measure the sound velocity first, and then measure the workpiece with the sound velocity.
B.5 Casting Measurement
The grain size of casting material is coarse and the structure is not dense enough, which will cause great attenuation of sound energy. In addition, the measurement is often carried out in the state of wool, so it is difficult to measure. The degree of attenuation is closely related to grain size and ultrasonic frequency. At the same frequency, the attenuation increases with the increase of grain diameter, but when it exceeds the highest point, the attenuation tends to a fixed value. For probes with different frequency, the attenuation increases with the increase of frequency. When the coarse grain and casting in the presence of coarse heterogeneous structure, the ultrasonic signal will produce abnormal reflection, grass echo or tree echo, resulting in the
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reading error. Coarse grain size and inconsistent densification of tissues at different positions in the workpiece will cause differences in sound velocity and make the measurement results inaccurate.
Note:
When measuring the casting with rough surface, a coupling agent with high viscosity must be used. It is recommended to calibrate the sound velocity of the material with a block of the same material and direction as the measured object. B.6.4 Probe Wear The probe surface is acrylic resin. Long-term use will increase its roughness, resulting in a decrease in sensitivity. If the probe is badly worn, sandpaper or whetstone can be used to smooth the surface. If the measured value is still unstable, replace the probe. B.6.5 Multilayer and Composite Materials It is impossible to measure multilayer materials with incompact bonding surfaces because ultrasonic waves cannot penetrate uncoupled surfaces. Ultrasonic waves cannot spread at uniform speed in composite materials, so the gauges measuring thickness by ultrasonic reflection principle are not suitable for measuring multilayer and composite materials.
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B.6.6 Influence of Oxide Layer on Metal Surface Some metals, such as aluminum, have a dense oxide layer on their surfaces. This oxide layer is closely bonded with the matrix, but the spread speeds of ultrasonic wave in these two substances are different, so it will cause error. Please pay attention to this condition when using. Users can select a sample block from the same batch of measured materials, measure its thickness with micrometer or caliper, and calibrate the gauge with this sample block.
B.6.7 Abnormal Thickness Reading Operators should be able to identify abnormal readings, which are usually caused by rust spots, corrosion pits, and internal defects. Solutions can be found in the relevant sections of this manual.
B.6.8 Selection and Use of Coupling Agents
The coupling agent is used as the carrier of ultrasonic signal spread between the probe and the measured material. If the type or use method of coupling agent is improper, it may cause error, or the coupling symbol flickers, and the measured value cannot be stable. The coupling agent should be applied in appropriate amount and coated evenly. Low viscosity coupling agents can be used on smooth surfaces. High viscosity coupling agents can be used on rough, vertical and top surfaces.
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B.7 Methods for Reducing
Errors B.7.1 Ultra-Thin Materials
With any ultrasonic thickness gauge, errors will occur when the measured material thickness falls below the lower limit of the probe. When measuring ultra-thin materials, a false result called “double refraction” sometimes occurs: the reading is twice as thick as it actually is. Another type of false result is called “pulse envelope, cycle jump”: the measured value is greater than the actual thickness. In order to prevent such errors, the ultra-thin material measurements should be checked repeatedly.
B.7.2 Rust Spots and Corrosion Pits Rust pits on another surface of the measured material (small rust spots are sometimes difficult to detect) will cause irregular changes in the reading and in extreme cases no reading at all. When pits are found, this area should be measured with great care. Multiple measurements can be performed by selecting the orientation of the probe partition board at different angles. B.7.3 Material Identification Error When the gauge is calibrated with one material and then measures another, the wrong result will be obtained. Please select the correct sound velocity.
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9. Packing List

NO.

1

Standard

2

accessories 3

4

5

6

Item Ultrasonic thickness
gauge Probe (5MHz 10)
Coupling agent Carrying bag
Data cable User manual

Quantity
1
1 1 1 1 1

Remarks

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Warranty
Triplett / Jewell Instruments extends the following warranty to the original purchaser of these goods for use. Triplett warrants to the original purchaser for use that the products sold by it will be free from defects in workmanship and material for a period of (1) one year from the date of purchase. This warranty does not apply to any of our products which have been repaired or altered by unauthorized persons in any way or purchased from unauthorized distributors so as, in our sole judgment, to injure their stability or reliability, or which have been subject to misuse, abuse, misapplication, negligence, accident or which have had the serial numbers altered, defaced, or removed. Accessories, including batteries are not covered by this warranty
Copyright © 2022 Triplett
www.triplett.com

References

• Triplett Test Equipment & Tools for Industrial & Electronics Solutions

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