UM-1 user manual
Contents
1. Silver 0 142 3607 Steel common 0 233 5918 Steel stainless 0 223 5664 Stellite 0 275 apprx 6985 Teflon 0 056 1422 Tin 0 131 3327 Titanium 0 240 6096 Tungsten 0 210 5334 Zinc 0 166 4216 Water 0 058 1473 Tips the table above is for reference the actual velocities should be measured with the method mentioned in 4 3 Velocity measurement Appendix B Probe and Measuring Range Probe Frequency Diameter of the Measuring Available description MHZ contact range in contact proportion steel temperature Cast iron probe 2 0 638in 0 157 50 140 F ZT12 11 811 in Standard 5 0 472in 0 039 50 140 F probe PT12 7 874 in Standard 5 0 394in 0 031 50 140 F probe PTO8 3 937 in Small probe 7 5 0 299in 0 031 50 140 F 1 181 10 0 197 0 031 50 140 4 0 787 High temperature 5 0 551in 0 157 Below 57277 probe 3 150 in 298 Appendix Various Types of UM series and part of the specifications Type UM 3 UM 2 UM 2D UM 1 UM 1D Digital H lt 0 4in H lt 4in resolution 0 0001in 0 001in 0 01in Unit 0 001in 0 01in 0 01mm 0 i1mm 0 001in inch mm 0 001mm 0 01 H24in 0 1mm H the mm 0 1mm 0 01in height of H gt 0 4in 03 the testing Specifications object 0 001 in 0 01in 0 01mm O 1mm Measuring H in H in error 0 002 0 002in Unit 0 052. 16 8 1 The condition requirements on the surface of the WON DISCO e Grp 16 8 1 1 Clean surface eere eene hana haha 16 8 1 2 Enhancing the roughness requirement 16 8 1 3 Surface of the rough machine processing 17 8 2 Measuring methods scere resur 17 8 2 1 Single point measurement eene nenne 17 8 2 2 Double point measurement ee eere nnne 17 8 2 3 Multiple point measurement eere 18 8 2 4 Continuous measurement esee eene nnns 18 8 3 Methods for measuring pipe walls 18 8 4 Cast nana nana aaa 19 9 Maintenances and 19 ii 9 1 Power source inspection eee eene 20 9 2 Cautions M m 20 9 2 1 General eene nennen nennen nnne 20 9 2 2 Measuring Caulloris ss Ra E 20 9 2 3 Changing the Ran vER UE 20 9 3 21 TO After
3. UM 1 ULTRASONIC THICKNESS GAUGE USER MANUAL LONGRUN INDUSTRIAL INSTRUMENT CO LTD Content 1 General information of the gauge 1 1 1 Measuring eee 1 1 2 Basic configuration and names of various parts 1 1 2 1 of various 1 1 2 2 Standard 2 1 2 3 Optional configuration eee eere nnn 2 2 5 2 3 imi nre 3 4 Measuring 4 4 1 Gauge eene nnn 4 4 2 setting 4 4 3 Velocity 5 4 4 Gauge 1 enne nnn 6 4 4 1 Fast Calibrations ccs issu soak ia GuRUSEEFEEFS VERF E SS EERKME SEEN ENE 6 4 4 2 2 point calibration e eeer eere rennen nnn 6 4 4 3 Difference between fast calibration and 2 point c
4. METRIC Min capture OFF 2 Point CAL OFF Units METRIC Min capture OFF 2 Point CAL ON ENTER to select to down 1 to up Choosing the altering item ENTER to select todown 1 to up After altering by pressing ENTER After setting press MENU key to go back to the main operation interface With 2 Point CAL on the function of 2 point calibration can be used at any time when measuring 3 Process the 2 point calibration The detailed steps are as follows Firstly measure the thickness of the thinner block In the status of thickness display press CAL and there will be a Thin mark on the top right corner Adjust the value to the standard low limit by using or V Savel Menu Limit OFF Thin 10 5 5 Secondly press CAL and there will be a Thick mark on the top right corner then measure the thickness of the thicker block Adjust the value to the standard high limit by using or V Savel Menu Limit OFF Thick 7 Finally press CAL and finish the calibration 7 6 Brightness setting The detailed steps are as follows Enter into the function setup menu Then move the cursor to Set brightness by moving See the following figure Erase all data Erase CAL data Set brightness ENTER to select t to up 2 Enter into the interface of brightness by pressing ENTER key See the following figure Brightness 04 ENTER to Esc 1 to darken to light
5. See the following figure Savel Menu Limit OFF 10 0 a Note When the probe is coupling to the testing material there will be coupling sign on the screen On the contrary if the coupling status is not very good the coupling sign won t appear or it will keep flittering See the following figure Savel Menu Limit OFF 10 0 m 5 Thickness value storing and checking 5 1 Thickness storing Up to 500 thickness values can be divided into 5 files for storing Firstly choose the storing file number Press MENU key to make Save into highlighted See the following figure Savel Menu Limit OFF 590Q m s e tile number so tha Press J to change fixed The five files will display in turn See the following figure Storing file number can be Save3 Menu Limit OFF 5900 m s Secondly measure the thickness Thirdly save the reading After measuring the thickness the screen will display the thickness Then press MEM there will be a word Memory shining once in the lower left corner meaning that the storage has finished and the reading has been stored in the corresponding file 5 2 Thickness checking Press MENU to make Save into highlighted Then press J and the five files will display in turn so that you can choose the file you want to check See the following figure Save3 Menu Limit OFF Finally press MEM key to enter the file See the following figure ENTER to
6. be responsible for any of the problem nor the maintenance service 10 After sale services The ultrasonic thickness gauge products of our company have been tested strictly with high standards Customers can enjoy the following services The warranty period is ONE year after buying and the gauge would be maintained at any time for good The wear of the probe is not in the range of fixing insurance 2 During the warranty period the breakdowns caused by the quality problems of the gauge itself can be fixed by our company for free with your guarantee card 3 Our company offers you fixing service after the warranty period with a reasonable costing fee 21 Appendix A Sound Velocities of some Common Materials Sound Velocity Material in us m s Aluminum 0 250 6350 Bismuth 0 086 2184 Brass 0 173 4394 Cadmium 0 109 2769 Cast Iron 0 180 apprx 4572 Constantan 0 206 5232 Copper 0 184 4674 Epoxy Resin 0 100 2540 German Silver 0 187 4750 Glass Crown 0 223 5664 Glass Flint 0 168 4267 Gold 0 128 3251 Ice 0 157 3988 lron 0 232 5893 Lead 0 085 2519 Magnesium 0 228 5791 Mercury 0 057 1448 Nickel 0 222 5639 Nylon 0 102 apprx 2591 Paraffin 0 087 2210 Platinum 0 156 3962 Plexiglass 0 106 2692 Polystyrene 0 092 2337 Porcelain 0 230 apprx 5842 PVC 0 094 2388 Quartz Glass 0 222 5639 Rubber vulcanized 0 091 2311
7. block which shares the same material and same measuring direction with the testing object 4 Programming 2 point calibration if needed 9 Maintenances and cautions 19 9 1 Power source inspection When the power source voltage is low there appears a low voltage sign Battery should be change promptly in order not to influence the accuracy of the gauge Backlight should not be always on so that the battery can be used for longer Change the battery as the following steps 0 Turn off the gauge 2 Open the battery cassette 3 Take out the battery and put in new battery Pay attention to the polarity For long time sparing the gauge take out the battery in case that they will leak out the battery electrolyte which will corrode the battery case and pole piece 9 2 Cautions 9 2 1 General cautions Avoid shocking and putting the caustic liquid Such as dilute and ethyl alcohol into the instrument and the probe Wipe the cover and window with little amount of water After using the coupling paste and the dirt should be wiped away to keep the instrument clean and free from rust Avoid dripping sweat on the gauge in high temperature Spread some grease on the testing block on the gauge if the gauge will not be used for long and wipe it out when using Prevent the instrument from getting wet and do not leave it in a humid atmosphere for a long time When the probe is being plugged into or unplugged from t
8. capture ON 2 Point CAL OFF ENTER to select ENTER to select todown f to up to down to up Choosing the altering item After altering by pressing ENTER b After setting press MENU key to go back to the main operation interface See the following figure Savel Menu Limit OFF 10 0 m MIN Note with Min capture on when the probe is coupling to the work piece the screen displays the present thickness value when lifting the probe up the screen displays the minimum thickness value among the measuring results and the min capture sign MIN flickers for six times If you continue to measure during the time the sign MIN flickering the present thickness value goes on participating the min capture Measurement after the sign MIN stops flickering makes the gauge start again to catch the minimum value 7 5 2 point calibration Choose two standard blocks of the same material velocity and curve rate with the testing object The thickness of one of the blocks should be near to the low limit of the measuring scope while the thickness of the other to the high limit 2 point calibration can improve the accuracy of measuring The 2 Point CAL should be turned ON and the Min capture should be turned OFF before using the 2 Point CAL function The detailed steps are as follows D Enter into the system setup menu and then set 2 Point CAL ON See the following figures Units
9. erase Note No is the number of the present data in the file Total is the total quantity of the data in the present file You can check the readings in this file by pressing A V Press MENU or continue measuring will help you to the main operation interface after checking 6 Erasing the storing thickness values 6 1 Erasing an individual thickness value In the status of thickness checking press ENTER key to delete the present reading Enter into the statue of thickness checking See the following figure ENTER to erase ENTER key to delete the present reading and the next reading will appear See the following figure ENTER to erase 6 2 Erasing the present file To delete all the content in the present file do as the following steps 1 Press MENU key to make Menu into highlighted See the following figure Savel Menu Limit OFF 5900 m s Press ENTER key to enter the menu and make Function setup into highlighted by pressing V See the following figure System setup Function setup ENTER to select f to up Press ENTER key to enter the interface and select Erase file by pressing A or V See the following figure Erase all data Erase CAL data ENTER to select to down 8 After selection press ENTER key and the screen displays as follows Press ENTER to confirm Press MENU to cancel Then press E
10. mode is that the measuring range is relatively wide 0 031 in 19 685in with standard probe 25 Single crystal delayed probe is employed by UM 3 precise ultrasonic thickness gauge The multi echo is used to enhance the accuracy with the resolution of 0 0001in and the low limit of 0 012in There are two operating modes of UM 3 ultrasonic thickness gauge interface echo mode and mode The measuring range of 1 mode is 0 059 709 while the measuring range of E E mode is 0 012in 0 394in The operating principle of UM 3 is THICKNESS VELOCITY TIME n Note n is the number of times of the echo The more echoes the higher the accuracy System setup Basic items of UM 1 UM 2 UM 1D UM 2D UM 3 units min capture 2 point cal and language Additional items of UM 2 UM 2D probe and resolution Additional item of UM 3 resolution Probe UM 1 UM 1D UM 3 ultrasonic thickness gauge cannot recognize probes UM 1 UM 1D is matched with standard probe 08 when leaving factory while the standard probe of UM 3 is single crystal delayed probe However the probe of UM 1 UM 1D can be changed UM 1D with probe PT O8 can be applied in standard mode as well as the coating mode but the gauge can only be applied in standard mode with other probes attached Our company can also use other probe compensating wires in replace to the 08 compensating wire to meet your special testing requirements so that you can use dif
11. NTER to confirm deleting the present file and press MENU to 50 back to the last interface 4 After deleting press VEL or MENU to go back to the main operation interface 6 3 Erasing all data To delete all the thickness values in the gauge just select Erase all data and do other steps as above 6 4 Erasing CAL data To delete the calibrating thickness value just select Erase CAL data and do other steps as above T System setup and function setup 7 1 System setup Press MENU key to make Menu into highlighted See the following figure Savel Menu Limit OFF 5900 m s Then press ENTER key to enter into the menu See the following figure 10 System setup Function setup ENTER to select to down The System setup is highlighted if not you can adjust by moving AorV and press ENTER key to enter into system setup menu Press Aor V to select the item you want to alter and press ENTER to make the alteration There are totally four items in system setup they are units metric and imperial min capture 2 point cal and language You can set these items according to your need After setting you can go back to the main operation interface by pressing MENU or starting measuring 7 2 Function setup Press MENU key to make Menu into highlighted Then press ENTER key to enter into the menu See the following figure System setup Function setup ENTER to select to up Make Functio
12. al and making them perpendicular or parallel with each other to get the minimum reading as the thickness value 8 2 Measuring methods 8 2 1 Single point measurement This method involves measuring the thickness at a single point Use the probe to measure a random point on the surface of the testing object the value display is the thickness value 8 2 2 Double point measurement This method involves performing two thickness measurements near a single spot by using a dual crystal probe inclined at O and 90 respectively with respect to the split face See the following figure 17 90 OD Take the smaller of the two indicated values as the thickness of the material 8 2 3 Multiple point measurement This method involves performing a number of measurements within a circle having a maximum diameter of about 30mm See the following figure Take the minimum indicated value as the thickness of the material 8 2 4 Continuous measurement Continuous measurement method involves taking continuous measurements along a specified line according to the single measurement method at intervals of 5mm or less See the following figure 5mm Take the minimum indicated value as the thickness of the material Of the above methods the particular method used will be determined either by the prescribed standards or by consultation with the user If no particular method is indicated the double point measurement method should be em
13. alibration 6 4 5 Thickness measurement 1 enis enin aea nana n nana una 6 5 Thickness value storing and checking 7 5 1 Thickness Storing ee eccie 7 5 2 Thickness checklng 8 6 Erasing the storing thickness values 8 6 1 Erasing an individual thickness value 8 6 2 Erasing the present file scere c eee cre ecc eee eene 9 6 3 Erasing all d t a 10 6 4 Erasing CAL 10 T System setup and function setup 10 FI UCET 10 1 2 F nctlon setup nu 11 7 3 Setting the measuring unit 11 12 7 5 2 point calibratloli 13 55 5 14 FS Mice 15 7 8 The backlight function Leere eere 15 7 9 The low voltage warning 16 7 10 Ways of turning Off sssssnnsnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 16 8 Measurement applied skills
14. e help of couplant to the object and passing through the object until the probe receiving the reflection from the boundary 1 2 Basic configuration and names of various parts 1 2 1 Name of various parts LCD Screen Display m s unit of material velocity BATT Sign of low voltage mm or inch units of thickness 1 lt of good coupling Keyboard Function Illustration ON Open VEL Velocity MENU Menu MEM Memory CAL Calibration X Backlight lt I Enter A V Turn 1 2 2 Standard configuration UM series thickness gauge Standard probe Carrying case Two 1 5V AA alkaline batteries Couplant Operating manual Certification of quality Packaging list Insurance card 1 2 3 Optional configuration Attachable rubber case Numerous special probes on request High temperature probe cast iron probe small probe mini probe Probe cables Couplants and high temperature couplant 4 step 6 step block for calibration Data transmission cable Application software 2 Specifications Operating principle Ultrasonic pulse echo method with dual element probes Probe zero adjustment Selectable 1 point calibration normal measurement 2 point calibration curve surface measurement or other special application with a high precision V path correction Automatic Measuring range 0 8mm to 300mm 0 031in to 11 81in Depending on probe material and surface condition Digital res
15. en 14 Adjust the brightness by moving Aor V After finishing the adjustment press ENTER key to go back to the last interface and press MENU key to the main operation interface 7 7 Limits setting UM 1 ultrasonic thickness gauge can set low limit and high limit to realize the function of fast measurement The detailed steps are as follows 0 Move the cursor to Limit by pressing MENU key See the following figure Savel Mnu Limit OFF 5900 m s 2 Enter into the limit interface by pressing ENTER key The screen displays the original settings of the limits See the following figures Savel Menu Limit OFF Savel Menu Limit OFF 0 1 m 300 0 Low limit High limit Low limit setting High limit setting The high limit and low limit can display in turn by pressing ENTER key You can also set the new limits by pressing AorV 3 After setting pressing VEL MENU or start measuring can help you go back to the main operation interface Note when the present thickness of a work piece is out of the limits the buzzer in the gauge will give an alarm automatically 7 8 The backlight function The backlight function offers you convenience when getting the readings in dark condition At the same time you should pay attention to saving electric quantity Press 5 and the backlight will be turned ON press again and it will be turned OFF After taking off the gauge the backlight will also get turned off siS a
16. ferent types of probes in the coating mode Please connect with us when you have special requirements UM 3 is used for precise measurement so only the single crystal delayed probe can be applied UM 2 UM 2D is matched with standard probe PT 08 when leaving factory With many probe compensating wires in the gauge UM 2 UM 2D can recognize and be matched with various probes PT 08 5P 10 12 27 12 TG790H 04 06 freely when measuring UM 2D can be applied with different probes in both modes Repeatability UM 1 UM 1D 0 1mm or 0 001 UM 2 UM 2D 0 025mm 0 001 26
17. he socket just hold the metal lead of the plug and push pull it straight along the axis notrotate the plugs or the probe cable may get damaged Take the batteries out of the chamber if the gauge will not be used for a long time Don t try to take apart the instrument or the warranty will be void 9 2 2 Measuring cautions D Please allow the instruction With any unusual circumstance and problems please call us without hesitation 2 Only when the coupling sign appears and keeps stable can you get the reliable results 3 With the probe worn the measurement readings will be unstable Please change in that case 9 2 3 Changing the probe 20 When the sound insulation wall worn out and the following situations appear please change the probe 0 When measuring different thicknesses the readings are all the same 2 There are the sign of coupling and readings only with the probe plugged into the socket 9 3 Maintenances Contact with the maintaining department of our company with the following problems 1 Components damage and the gauge can not be used 2 The display of the screen is disordered 3 The measuring error is abnormally big with ordinary usage 5 Keyboard operation is disordered or doesn t work As the ultrasonic thickness gauge is a sort of high tech product the fixing work should be made by professional operator Do not try to take apart the instrument by yourself or we will not
18. material files for easy store and management The data cannot get lost after power off Thickness restriction alarm set the thickness limits and the value out of the limits will cause the alarm ringing Minimum value scanning MIN Capture mode catch the minimum value during the measurement 2 point calibration Curve surface measurement or other special application with a high precision Supporting thickness units of mm and inch The calibration value can be stored automatically without loss after taking off the gauge Low voltage warning function Backlight Bring convenience to night working Delete The skeptical data in the file or the whole file can be deleted so that new data can be stored Automatic shut off With no operation in 5 minutes Language English and Chinese Coupling status awareness The stability of coupling can be aware by the coupling sign Measuring steps 4 1 Gauge preparation After plugging in the probe connector to the gauge and pressing ON there will be two beep and the screen lights up The velocity displayed is that of last time The screen display is as follows Savel Menu Limit OFF 5900 m s 4 2 The setting of velocity With the known velocity of the material the build in velocity can be set manually according to the Velocity List in the appendix Totally there are 5 velocities be stored in the gauge The steps as follow If the present display is not the vel
19. mm 0 14mm inch mm H21in H21in 0 5 1 height of the testing object 24 Appendix The difference among the five types of UM series ultrasonic thickness gauge Interfaces UM 1 UM 2 UM 1D UM 2D Savel Menu Limit OFF Savel Menu Std Coat OFF 2900 ns 2900 ns PT 08 UM 3 Savel Menu 1 OFF 590Q m s HIGH Operating principles modes and measuring ranges UM 1 UM 2 ultrasonic thickness gauge measures the thickness of an object by precisely calculating the time of the probe sending ultrasonic pulse with the help of couplant to the object and passing through the object until the probe receiving the reflection from the boundary The operating principle is P E pause echo The measuring range is 0 031 in 19 685in There are two operating modes of UM 1D UM 2D ultrasonic thickness gauge standard mode and coating mode The operating principle of coating mode is E E echo echo When there is coating or oil paint on the surface of the object the net thickness of the material can be directly measured neither without necessarily removal of the coating nor without the calibration While the defect of this mode is that the measuring range is relatively narrow 0 118in 0 709in with standard probe The operating principle of standard mode is P E With the covered coating the measurement will not be very accurate so the coating should be removed before measuring in standard mode The advantage of this
20. n setup into highlighted by moving Aor V and press ENTER key to enter into function setup menu Press to select the item you want to erase or alter and press ENTER to make it There are totally four items in function setup they are erase file erase all data erase CAL data and set brightness You can set these items according to your need After setting you can go back to the main operation interface by pressing MENU or starting measuring 7 3 Setting the measuring unit 11 UM 1 offers two sorts of measuring units metric and imperial You can set the unit according to your realistic need The detailed steps are as follows Enter into the system setup menu and then move the cursor to Units by moving Alter the unit between METRIC and IMPERIAL by pressing ENTER key See the following figures Units METRIC Units IMPERIAL Min capture OFF Min capture OFF 2 Point CAL OFF 2 Point CAL OFF ENTER to select ENTER to select to down to down Choosing the altering item After altering by pressing ENTER 7 4 Min capture Min capture means catching the minimum thickness value among the measuring results when measuring The detailed setting steps are as follows a Enter into the system setup menu and then set Min capture ON OFF means to close Min capture while ON means to open the function See the following figures Units METRIC Min capture OFF 2 Point CAL OFF Units METRIC Min
21. ng lost which prove most 16 difficult to measure Making the surface smooth before measuring is therefore very important Often a wire brush or scraper will be helpful in cleaning surfaces Polishing filing and grinding with rotary sanders or grinding wheels may be used though care must be taken to prevent surface gouging which will inhibit proper probe coupling High viscosity couplant is also usually applied 8 1 3 Surface of the rough machine processing The regular slugs after rough machine processing such as lathing or planning on the surface of the work piece may also arouse measuring errors The compensation methods have been mentioned in 8 1 2 In addition to posing obstacles to measurement rough surfaces contribute to excessive wear of the probes particularly in situations where the probe is scrubbed along the surface Probes should be inspected on a regular basis for signs of uneven wear of the wear face If the wear face is worn on one side more than another the sound beam penetrating the test material may no longer be perpendicular to the material surface In this case it will be difficult to exactly locate tiny irregularities in the material being measured as the focus of the sound beam no longer lies directly beneath the probe The test result may be more accurate by adjusting the angle between the sound insulating wall the metal film through the center of the probe bottom of the probe and the slugs of the materi
22. ocity press VEL to enter the velocity status The velocity in the present velocity storing file will display and every time you press VEL the 5 velocities will change in turn See the following figures Savel Menu Limit OFF Savel Menu Limit OFF 5900 ns 6320 Press VEL to enter the velocity status Press VEL to change the velocity If there is not the needed velocity press A or V to change At the same time you can store the velocity to the gauge so that you can easily find it next time See following figure Savel Menu Limit OFF 5905 m s Press or V tochange The A below ones place tens place and hundreds place can be moved when adjusting the velocity value and every time you press or V the value will be added by 1 10 and 100 in turn Press to movethe A 4 3 Velocity measurement With the unknown material velocity velocity calibration is necessary Do as the following steps D Prepare a testing block of the same component with the testing object Make its surface suitable for testing Then measure the thickness of the block with a slide caliper D Measure the thickness of the prepared testing block with the ultrasonic thickness gauge 8 Press VEL and adjust A V until the thickness is the same with the known thickness of the testing block The velocity displayed is that of the testing object 4 The velocity will be stored into the present velocity unit automatically 4 4 Gauge calibration 4 4 1 Fa
23. olution 0 0071 or 0 4mm Selectable inch mm Display 128 X 64 dot matrix LCD screen 1 65in X 2 24in 42mm X 57mm EL backlight and switchable contract ratio Digit height 0 54in or 13 75mm Measurement update rate 4 Hz in standard measurement mode 25 Hz in MIN capture mode Material velocity range 1000 to 9999 m s 0 039 to 0 394 inch us Power Two 1 5V AA alkaline batteries Warning with low battery voltage Operating time Up to 200 hours without backlight with alkaline batteries depending on operating mode Auto shut off After 5 minutes of non use Operating temperature 10 to 50 C 14 to 122 Specification to 20 C 4 F on request 5 86 X 2 87in X 1 25in 149mm 73mm 32mm H XW X D Weight 2005 7oz including batteries Data logger capacity Up to 500 readings can be divided into 5 files user selectable Operating language English and Chinese Measuring error Up to 1in 0 002in or 0 1 Above 1 H H is the height of the testing object Repeatability 0 001in or 0 4mm Application software UMVIEW Interfaces Serial RS 232 port in combination with a TGDL cable Data transfer parameters 8 bits 1 stop bit 9600 baud no parity 3 Main functions X X X 4 Modifying systematical errors by using the 4mm standard block on the instrument Data logger Up to 500 readings can be divided into 5 different
24. ployed in combination with one of other methods Taking into account the corrosion condition of the material 8 3 Methods for measuring pipe walls The thickness of a pipe can be measured accurately with this gauge The 18 measurement range is shown in the following table Probe type Pipe diameter mm Thickness mm Pt 08 10 and 12 220 21 2 The split plane of the probe may be along the pipe axis or perpendicular to it as shown in the following figures Pipe samples In this case the readings on the screen will change with some regular patterns and the smallest display value should be taken as the thickness value For small pipes measurement should be made in both directions moving probe a little bit For large pipes measure the thickness of the wall along the direction perpendicular to the pipe axis See the following figure insulative wall 4 Bottom view of probe 8 4 Cast Measurement There are special features of cast measurement The grain size of cast material is relatively rough and the organization is not very tight Added with the rough surface measuring status the measurement of cast material is very difficult So the following tips should be taken 1 Use low frequency probe like ZT 12 in our company 2 When measuring the cast work piece with no processing on the surface high viscosity couplant such as machine oil grease and water glass are needed 3 Calibrate the sound velocity with the standard
25. sale Services ei Vi cercavi a 21 Appendix A Sound Velocities of some Common Materials 22 Appendix B Probe and Measuring Range 23 Appendix C Various Types of UM series and part of the Specifications i n a ioa tnra idee n t cn 24 Appendix D The difference among the five types of UM series ultrasonic thickness gauge 25 iii 1 General information of the gauge UM 1 ultrasonic thickness gauge made by our factory is a simple to use highly accurate hand held ultrasonic thickness gauge with the operating principle of ultrasonic wave measuring It can measure quickly nondestructively and precisely with a resolution of 0 1mm or O O1in This instrument can be widely used in the fields such as manufacturing metal processing chemistry and business inspecting for measuring the thickness of all sorts of materials where ultrasonic wave can spread through with a constant speed and get the reflection from the back side Apart from making accurate measure on various kinds of plates and processing components it can also make detection on various kinds of pipes and pressure containers of the manufacturing facilities about their thickness loss after corrosion Um 1 is an incensory specialized instrument for material protection 1 1 Measuring principle UM 1 ultrasonic thickness gauge measures the thickness of an object by precisely calculating the time of the probe sending ultrasonic pulse with th
26. st calibration Calibration should be made every time after changing the probe which is very important to ensure the accuracy of the testing Fast calibration can be made every time before testing if necessary Spread the couplant on the testing block on the gauge and make the probe coupled to the testing block until the coupling sign Ph appears without flickering Then press CAL to finish calibration If the velocity is 5900m s the thickness value display is 4mm See the following figure Savel Menu Limit OFF 4 0 P Tips If the velocity is not 5900m s the thickness value is not 4 0mm after fast calibrating and testing the block on the gauge which is a common phenomenon 4 4 2 2 point calibration In order to make curve surface measurement or other special application with a high precision 2 point calibration can be applied For detail see Chapter 7 5 4 4 3 Difference between fast calibration 2 point calibration 0 Fast calibration use the testing block on gauge while the 2 point calibration can use any block of various materials and thicknesses Fast calibration use only one testing block while the 2 point calibration use two blocks with different thicknesses 4 5 Thickness measurement After calibration and velocity setting spread the couplant on the testing area of the testing object and coupled the probe with the testing object completely The screen will display the thickness value of the testing object
27. utomatically 7 9 The low voltage warning function When the voltage of the battery is low there will be a BATT sign on the screen You should change the battery for further usage See the following figure Savel Menu Limit OFF 5900 m s BATT 7 10 Ways of turning off There are two ways of turning off the gauge for you to choose auto off and manual off The gauge will turn off in 5 minutes with no operation You can also press MENU key to move the cursor to and press ENTER key to turn off the gauge 8 Measurement applied skills 8 1 The condition requirements on the surface of the work piece 8 1 1 Clean surface In any ultrasonic measurement scenario the shape and roughness of the test surface are of paramount importance Rough uneven surface may limit the penetration of the ultrasound through the material and result in unstable and therefore unreliable measurement The surface being measured should be clean and free of any small particular matter rust or scale The presence of such obstructions will prevent the probe from seating properly against the surface So before measuring all the dust dirt and rust corrosion should be removal as well as the covered paint Often a wire brush or scraper will be helpful in cleaning surfaces 8 1 2 Enhancing the roughness requirement The extremely rough surface such as the pebble like finish of some cast irons will always arouse measuring error or readi
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