ULTRASONIC FLAW DETECTOR Velograph II

Transcription

1 VELOG LTD PASSPORT MANUAL ULTRASONIC FLAW DETECTOR Velograph II LONDON MOSCOW, 2018

2 1. General information Purpose Basic principles of use Equipment and accessories Basic kit Additional accessories Basic information Getting started Power Working with a battery Device structure Device construction Cables Connectors Display Indicators Working positions of the unit Connecting transducers Connecting to a computer Warnings Device control Basic principles of interface Changing modes and parameters Generator mode Scan mode Probe mode Object of Control mode Gates mode TVG mode DAC mode Memory settings mode Freezing function and saving A-scan Settings window Software version window Maintenance Battery charge Periodic maintenance Possible malfunctions Technical specifications General Pulser Receiver Reliability Material capacity indicators Environment Warranty...36

3 GENERAL INFORMATION 1. General information 1.1. Purpose Ultrasonic flaw detector Velograph II is meant to search for violations of continuity and uniformity of the material and determine their coordinate in products from metals and plastics. The device allows you to control welds, measure the thickness of the walls of the product, to search places of corrosion, cracks, delaminations and other internal defects Basic principles of use The ability to detect defects in the products material with ultrasonic flaw detector is based on the fact that in the majority of solid materials, especially in metals, ultrasonic waves propagate well. At the same time they are reflected from the boundaries of the internal heterogeneity of the material. The work of the device is based on this. An ultrasonic flaw detector periodically sends short pulses of ultrasonic waves using ultrasonic transducer into controlled object. Using the same ultrasonic transducer pulses reflected or passed back through the material of the ultrasonic waves are converted into electrical signals and fed to the electronic unit flaw. After amplification, digitization and processing using embedded processor, signals are transmitted via a wireless protocol into a portable digital assistant (PDA) and displayed on the LCD screen. The signals are displayed on a flaw detector in the same way as in an oscilloscope screen coordinates amplitude - time. The vertical axis represents the amplitude, and the horizontal - time. The origin is in the lower left corner of the screen. The amplitude of the echo signal carries information primarily about the magnitude of the object reflector of control or the degree of "transparency" of the material passed at reception of ultrasonic waves. Signal delay time, that is its position on the time axis indicates the magnitude path along which the signal passed. This value is easy to calculate, knowing the speed of wave propagation in the material. The most commonly used is a representation of the signals on the flaw detector screen. It briefly called A-scan. When the flaw detector echo technique with a combined or separately-joinable converter temporary position echoes on the screen is proportional to the distance from the transducer location of the reflectors. In this case, the ULTRASONIC FLAW DETECTOR - VELOGRAPH II 3

4 GENERAL INFORMATION horizontal axis after the conversion time distance based on the velocity of propagation of ultrasonic waves can be calibrated in millimeters. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 4

5 EQUIPMENT AND ACCESSORIES 2. Equipment and accessories Ultrasonic flaw detector Velograph II consists of PDA and an electronic unit, which is to ensure the full functional capacity of the flaw to be additionally equipped with piezoelectric transducers, cables, auxiliary accessories, etc. PDAs and electronic unit interconnected via Bluetooth wireless technology Basic kit Velograph II is usually offered to consumers in the base case configuration, the composition of which is designed to support most of the functions of classical thickness measurement and flaw detection. Fig. 1 shows the basic structure of the supplied flaw Velograph II, and in the Table. 1, a complete list of all the products included in this set. Table. 1. Basic supply kit Name Quantity 1 Electronic unit of flaw detector 1 pc. 2 PDA with charger and installed Velograph II software 1 pc. 3 Electronic device charger unit 1 pc. 4 Double cable LEMO-LEMO 1,2 m 1 pc. 5 Transducer 2 pc. 6 Passport and manual 1 pc. The manufacturer reserves the right to replace the transducers and other changes in the basic kit. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 5

6 EQUIPMENT AND ACCESSORIES Fig. 1. Basic kit Velograph II 2.2. Additional accessories Velograph II can be equipped with optional accessories to expand its capabilities and provides more convenience when working. These accessories are available as bundled with VFL and on request. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 6

7 BASIC INFORMATION 3. Basic information 3.1. Getting started Before first use is recommended for PDAs and electronic flaw detector unit charging via AC adapter at least 4 hours. Turning on and off the electronic unit by pressing the "Power" button when it is once pressed continuously until the moment when stops blinking blue LED. The inclusion of the PDA made the "Power" button when it is once pressed continuously until the moment when the boot splash screen appears on the screen. On the PDA screen, click on the icon «Velograph II». The working window will appear with Velograph II program (Fig. 2), which will be carried out next steps for configuring flaw. Press the "On" button in order to interface the PDA and electronic flaw detector unit. In a pop-up window, click "Search" button, then on the list find the name and number of the electronic unit, for example, velographii_0012. The number is also engraved on the electronic unit. Click on the name of the device. The next step you must enter a four-digit PIN-code corresponding to the device number. Click OK (Fig. 3). Flaw detector is ready to use. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 7

8 BASIC INFORMATION Fig. 2. Velograph II application window Fig. 3. PIN-cod erequest window when paired with the PDA electronics. On subsequent pairings just click on the "On" button, and then - on the device name in the list. "Search" and enter the PIN-code are not required. Pairing must be performed each time the PDA and electronic unit are on. If in the process of connecting the display due to the electronic control unit is red or change color over every 6 seconds, or change from blue to red, press "Off" button and repeat the pairing. If this does not give results, turn off and turn on the electronic power supply button, then try pairing Power Working with a battery The basic package includes built-in PDA and electronic unit batteries. Charging the battery is carried out by chargers, which are also supplied with the device, through micro USB connector standard in the electronics housing (Fig. 4, 5) and PDAs (Fig. 6). Depending on the degree of battery discharge charge can last up to 3 hours. Working with flaw detector is possible with the batteries alone and during battery charging. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 8

9 BASIC INFORMATION Fig. 4. Charging electronic unit 3.3. Device structure Device construction Flaw detector Velograph II consists of the PDA and electronic unit with connected ultrasonic transducers. Velograph II electronic unit consists of following elements: 2-channel square-wave pulse generator 2-channel receiver with an amplifier and analog-to-digital converter gate-processing block memory microcontroller LED and vibration defect-signaling detector wireless units battery and battery charging unit The appearance is shown in Fig. 5 and Fig. 6. Device contact to an external computer is carried out by a mini USB-port or wireless protocols. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 9

10 BASIC INFORMATION , 2 Connectors for inclined and straight combined, direct separatecombined transducers angle and normal single crystal probe, normal double probe 4 Connector for connecting external 3 5 devices Power button of the electronic unit Micro USB Connector for electronic unit charging 5 Fig. 5. Velograph II electronic unit ULTRASONIC FLAW DETECTOR - VELOGRAPH II 10

11 BASIC INFORMATION 2 1 PDA power button 1 2 Micro USB Connector for charging and PDA and PC connection Fig. 6. PDA Cables Coaxial cable has high durability; It does not crack and remains flexible when working at low temperatures ( 30 ) Connectors The electronic unit is equipped with two coaxial LEMO connectors and special connector (the EXT) for connecting external devices (path sensor, keyboard, etc.) Display Indication of echo signals, information on operating modes, characteristic of probes, control parameters is performed on the liquid crystal display of the PDA. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 11

12 BASIC INFORMATION Indicators If you exceed the amplitude threshold orange defect indicator that corresponds to the number of gates is displayed, the amplitude of which is exceeded. When the power button is pressed it displays the charge level of the battery (see 5.1). Fig. 7. LED fault signal and battery 3.4. Working positions of the unit Duting the field work the electronic unit is attached to the belt or on the hand or placed in a pocket Connecting transducers ULTRASONIC FLAW DETECTOR - VELOGRAPH II 12

13 BASIC INFORMATION When working with the single cristal probe one of the cable connectors needs to be connected to the transducer, and the plug marked with the same (or also without notes) at the other end of the cable to connect to any of the ports of the electronic unit. When using double probe, both the connector at one end of the cable are connected to the transducer, connectors on the other end to the electronic unit, in any order. Fig. 8. Connect the PDA to the PC window 3.6. Connecting to a computer The inspection results are stored in the PDA. To transfer the results, connect the PDA and a computer with the USB cable. The PDA will be treated as a camera. The results can be copied from the folder that was set to store them (see 4.1.8) Warnings ULTRASONIC FLAW DETECTOR - VELOGRAPH II 13

14 BASIC INFORMATION The device is intended for use under the following environmental conditions: temperature from minus 20 to plus 45 C; relative humidity up to 95% at a maximum temperature of 35 C. The location of the flaw detector should be protected from direct exposure to dust, moisture and corrosive environments. RFI field strength in the location of the flaw detector placement must not exceed the value violates the operation, ie, created on input amplifier flaw voltage greater than half the maximum sensitivity. At high field strength of radio interference measures must be taken to screening accommodations flaw detector from external electromagnetic field. To eliminate condensation inside the electronics housing when moving it from a cold to a warm place, it is necessary to sustain it for at least 4 hours in the room before turning. It is forbidden to dive PDAs and electronic unit flaw in the liquid. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 14

15 DEVICE CONTROL 4. Device control 4.1. Basic principles of interface Changing modes and parameters Velograph II flaw detector interface consists of the following modes: Generator, Sweep, Transducer, Object of Control, Gates, TVG, DAC, Memory settings and request of a pop-up window Software version". Mode switching occurs by clicking on the name of the current mode in the lower left corner of the screen and selecting the appropriate mode from the pop-up list. Fig. 9 with the arrow indicated the following areas: Current mode 1 9 The x-value 2 Slider to change the numerical values of the parameters 10 3 "Accumulation of signals" button 11 Power on/off button Display electronic unit battery 4 Display of gates 12 5 The signal amplitude as a percentage of the screen height 13 6 The amplitude of the signal in decibels relative to gate level 14 7 The delay time of the signal/beam distance 15 Status display with an electronic unit Horizontal scale Vertical scale «Freeze» button 8 The vertical distance ULTRASONIC FLAW DETECTOR - VELOGRAPH II 15

16 DEVICE CONTROL Fig. 9. PDA window when interfacing with the electronic control unit Open "Settings" window by clicking on the upper right corner of the screen (or the area of the battery charge indicator connection with the electronic control unit). Two function keys are available for all modes: «freeze» and «memory». «Memory» button is displayed when you click on the «freeze» button (see ). Automatic signal indication in active strobes and current selected strobe can be done during all modes. While pressing the chosen strobe a menu will open where you can choose active strobes and bind their thresholds to amplification (see ). ULTRASONIC FLAW DETECTOR - VELOGRAPH II 16

17 DEVICE CONTROL The vertical scale is calibrated in percentage or in db relative to the active gate. The horizontal scale - in microseconds signal delay (ms), the vertical component (Y, mm) or horizontal component, taking into account the boom (X, mm). Selecting the calibration is carried out by pressing the appropriate scale and then selecting the pop-up menu the required units (horizontal scale option is also available in the popup list option "Scale" mode "Sweep" (see 4.1.3). The flaw detector Velograph II has an intuitive way to input parameters in all modes. Each mode is a set of parameters. The "Gain" is duplicated in all modes except DAC. There are several ways to change the parameters. If a digital setting is on a white background, its numerical value can be changed. To do this, first click once on the value or on the inscription on his left, then the parameter becomes active and highlighted in yellow border. Further options are possible: o Push and hold "slider" on the left side of the screen, or press on it periodically. The rate of change of the parameter is determined by how far away from the center by pressing and holding. o Re-click on the active option. The virtual keyboard will appear to enter a new value and click "Next" or "Finish". If the parameter value to the right of the triangle is a vertex directed downwards, to change it it is necessary to click on and select the appropriate value from the dropdown list. If the parameter is represented as a switch or a button (on a dark background), then press it to do the changes. Please also note that the flaw detector system is not equipped with electrical damping. Adjustable frequency only sets the pulse duration. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 17

18 DEVICE CONTROL Generator mode In the "generator" mode, the gain is set, select the ultrasonic channel, given the frequency of the probe pulse and the voltage on the transducer. Tab. 2. Parameters in generator mode Parameter Purpose Range and (or) units Changing gain 0 84 db Changing generator channel 1 or 2 Changing input channel 1 or 2 Selection of impulse frequency MHz Selecting the voltage applied to the transducer Low, Normal or High Scan mode "Scan" mode is used to set gain, select scan display, select ultrasonic channel, select the units of measurement and the horizontal scale as well as to set the sweep range. Tab. 3. Scan mode parameters Parameter Purpose Range and (or) units Setting the amplification factor 0 84 db Selecting the presentation of the detected or undetected radio impulse Selection of units horizontal scale A-scan. Setting the display coordinates of the beginning of the horizontal axis of the A-scan according to the selected unit of measurement Det or Rad mcs, Y mm or X mm mcs or mm Setting the display coordinates of the end of the horizontal axis of the A-scan according to the selected unit of measurement mcs or mm ULTRASONIC FLAW DETECTOR - VELOGRAPH II 18

19 DEVICE CONTROL Probe mode "Probe" mode is used to set amplification factor, the name of the probe, the passage of the ultrasound transducer in the wedge, the sound velocity in the test object, the angle of probe and x-value. For application of the new name of the transducer press More button on the keyboard, to cancel press the backspace button and change mode. Tab. 4. Parameters in the transducer mode Parameter Purpose Range and units Setting the gain factor 0 84 db Sets the wedge delay time of ultrasound transducer. mcs Installation of ultrasonic velocity in the testing object. m/s Installation angle of probe in the control object (degree) Installing the transducer x-value. mm Object of Control mode In the Object of Control mode the gain is set, speed of sound in object of control, display of stratification depth of reflector and thickness of the object of control. The depth of reflector is calculated from coordinate Y and fixed thickness. Tab. 5. Parameters in Object of Control mode Parameter Purpose Range and (or) units Setting the gain factor 0 84 db Setting of ultrasound speed in the object of control m/s Switch on or switch off display of reflection depth Setting of thickness of object of control On or Off mm ULTRASONIC FLAW DETECTOR - VELOGRAPH II 19

20 DEVICE CONTROL The use of depth computation at an input angle other than 0 degree is possible only at objects of constant thickness with plane-parallel surfaces or when checking along the generatrix of a cylindrical or conical surface, otherwise calculation of the depth from the Y coordinate should be perfomed manually Gates mode "Gates" mode is used to set the gain, the response mode, vibration mode, the level of the gate, the coordinate of the start and length of the gate. Selecting the active gate is carried out by a single touch on the appropriate number of the gate in the upper left corner of the screen, or by clicking on the appropriate gate on the A-scan. Similarly, a "clicking" on the gate, it is possible to move around the A-scan without changing the length. The duration of the gate can be adjusted by holding the gate "pressed" and spending another finger horizontally anywhere on the A-scan. To change the number of gates should press the number of the active gate, and the pop-up list, select the number of gates. Signatures "Level", "Home" and "Length" are illuminated background of the same color as the selected gate. To display the menu for setting the number of strobes and the mode of binding the thresholds of gates to the gain (fig. 10), click on the number of the currently selected strobe. Tab. 6. Parameters in the gate mode Parameter Purpose Range and units Setting the amplification factor 0 84 db Setting the alarm mode (vibration or release of relevant parameters in red) in the case of excess (up arrow) or of failure (arrow down) gate level Enable or disable the electronic module vibration alarm, Off or On Setting the vertical level of the active gate % Setting the start horizontal position of the active gate mcs, Y or X ULTRASONIC FLAW DETECTOR - VELOGRAPH II 20

21 DEVICE CONTROL Setting the length of the active gate mcs, Y or X TVG mode «TVG» mode is used to set amplification factor, the number and depth of the extension marks amplification. By activating «TVG» mode in the right part of the A-scan is displayed scale corresponding to the value of the additional gain. The vertical coordinate of the first label matches the value of the current amplification factor. If configured in the amount of additional reinforcement to the current exceeds a range of 84 db, it will be reduced to 84 db in the entire portion of the excess. For maximum dynamic range TVG should reduce the current gain to 0 db. TVG mode label may be selected and moved around the A-scan is similar gates. Tab. 7. Parameters in the TVG mode Parameter Purpose Range and units Changing the amplification factor 0 84 db Enable or disable the TVG (TVG curve) Off or On TVG range of label numbers to change its parameters (depth and additional gain) Installation arrangement depth (horizontal axis) of the selected mark TVG Installing additional amplification selected mark relative to the first mark Setting TVG marks quantity 1 8 Y, mm db Up to 8 marks ULTRASONIC FLAW DETECTOR - VELOGRAPH II 21

22 DEVICE CONTROL DAC mode In the distance amplitude correction curve mode (DAC) the number of markings on the curve is set (up to 255 markings), corresponding to them distance on the beam or depth (while mapping Y on horizontal scale) and damping value (in negative decibels relatively 100% of screen height), quantity of displaced curves and the size of their displacement according to major distance amplitude correction. To choose current displaced curve or distance amplitude correction curve the indicator is used, similar to the strobe indicator: PICTURE. To set common number of curves press the active curve and set the desired number in the menu. While choosing the distance amplitude correction curve parameters of its markings are set, while choosing one of the displaced curves its dicplacement is set. In the DAC mode and while choosing distance amplitude correction curve vertical scale will be shown in negative decibels according 100% height of the screen. In the DAC mode is it possible for markings to move on the A-scan similar to strobes. Tab. 8. Parameters in the DAC mode Parameter Purpose Range and units DAC on and off (DAC curve) On and Off Choosing DAC curve or displaced curve (number of curves in the menu) Choosing the number of a DAC marking to change its parameters Setting of a placement of chosen DAC marking Beam, mm or Y, mm Setting of a damping level in the chosen marking according to 100% screen height Negative db Setting of a DAC marking quantity Up to 255 markings Setting of a displacement of a chosen curve according to DAC db ULTRASONIC FLAW DETECTOR - VELOGRAPH II 22

23 DEVICE CONTROL Memory settings mode In the "Memory Settings" mode is set amplification factor, it shows the number and name of the current settings are displayed in the download function, and save the settings in the memory of the electronic unit. "Memory settings" mode is activated in order to maintain this configuration flaw or download settings. To save the settings, click the button "Save As". After pressing the displayed list, the bottom line is that the field name to save the settings, for example, setting1. To change the name, press the name. The keyboard appears, with which it is possible to change the name of the setting. Setting number is selected, "scroll through" the list of options available. To download from the memory setting, press the button from the list that appears, select the desired setting. "Download" and Fig. 10. Settings list window Freezing function and saving A-scan Freeze function is activated by pressing a button «to freeze». This A- scan "freezes" and the right of that button appears the button «save A- scan». ULTRASONIC FLAW DETECTOR - VELOGRAPH II 23

24 DEVICE CONTROL When you push the button «save A-scan» a window «Save control result» will appear, which is possible with the A-scan to save the description of the object of control, a surname of the flaw detector user, transducer, and choose where to save the testing report with A-scan. The saved protocol is an image in PNG format, which can be transferred from the PDA to the PC (see para. 3.6) and print or insert into the report. It shows the current settings of the device, set at the time of pressing the freeze button (except for the types of vertical and horizontal scales - used current), and a set of displayed values defined in the "Settings" window (see para ) While pressing the «freeze» button again A-scan will come alive and the work continues as normal. Fig. 11. Saved A-scan Settings window ULTRASONIC FLAW DETECTOR - VELOGRAPH II 24

25 DEVICE CONTROL When you activate a "Settings" window, the screen displays a set of userdefined parameters, the purpose of which is described in Tab. 10. Fig. 12. User settings window ULTRASONIC FLAW DETECTOR - VELOGRAPH II 25

26 DEVICE CONTROL Tab. 9. Parameters in the Settings window Parameter Purpose Range and units x Estimated number of divisions a horizontal axis A-scan y The number of divisions of the vertical axis A-scan Thickness of lines The thickness of the lines and curves sonogram TVG pixels Background Echogram Grid Text Gate 1 Choosing the color of A-scan Choosing the color of the echogram Choosing the color of the grid Choosing text color Choosing gate 1 color Gate 2 Choosing gate 2 color Gate 3 Choosing gate 3 color Gate 4 Choosing gate 4 color Filling TVG The choice of color fills in the signal accumulation mode Choosing TVG color curve Amplitude Turn on / off amplitude display Off or On The amplitude of the threshold of the gate The propagation time / distance ray Turn on / off the display of the amplitude with respect to the gate Enable / Disable display of the distance along the ray Off or On Off or On Coordinate Y Enabling / disabling the Y Off or On Coordinate X Enabling / disabling the X Off or On ULTRASONIC FLAW DETECTOR - VELOGRAPH II 26

27 DEVICE CONTROL Delay / coordinate between the signals 1 and 2 gates Cancel Enable / Disable display of the distance between the fronts of the two signals, located in the first and second gate. Exit from the "Settings" mode without saving changes Off or On Apply Exit from the "Settings" mode and save changes Color settings are applied only on the PDA screen, sonogram control protocols are displayed in the colors of the default. Set defined to display values stored in the control protocol. Changing these parameters will be in a mode including "freezing". To reduce the visual grid thickness to install it color close to set the background color. Displaying variables with a temporary and coordinate representation is determined by the selected horizontal scale. A distance along the ray is displayed in mm in the case of «scale Y mm", and in the case of "scale X mm" Software version window In Software version window you can see current software version that is used on thid PDA and number and version of thr firmware of electronic unit. You can see it only after connecting to electronic unit. Fig. 13 Software version window Other functions If you select "Other" mode, the "Other Functions" window opens, where you can select the step-by-step scenario for automatic or semiautomatic adjustment of the inverter parameters on calibration samples. Semi-automatic tuning differs ULTRASONIC FLAW DETECTOR - VELOGRAPH II 27

28 DEVICE CONTROL from the automatic one in that it is necessary to manually set the gates for echoes and / or adjust the gain. Before starting the scripts, you need to make sure that the installed channels of the generator and amplifier correspond to the connection channels of the converter (see 4.1.2, 5.3). If necessary, the delay in the prism of the converter is calculated as: T "#$%& = d )T * d * T ) 2(d ) d * ) where T "#$%& delay in prism, d ) и d * known distances to the reflectors of a calibration or tuning sample, T ) и T * defined pulse delay times from these reflectors. Speed of sound is calculated as: c = 2(d ) d * ) T ) T * where c speed of sound in a calibration sample. For inclined transducers, the input angle is calculated as: z α = arccos 5 c 7 T 2 T "#$%&8 + D ; 2 where α input angle, z depth of the cylindrical reflector, T the definite pulse delay from the reflector, D the diameter of the cylindrical reflector. In semiautomatic tuning TVG to adjust the signal amplitude a modifier to the current point is calculated as: V = 20 log A C&D A where V gain increase in decibels, A C&D specified amplitude of the signal, A current signal amplitude in the gate. With semi-automatic adjustment of the DAC, a curve is constructed in accordance with the formula for the amplitudes of the echoes reflected from a disk or a flat-bottomed hole in the far zone of the converter: ULTRASONIC FLAW DETECTOR - VELOGRAPH II 28

29 DEVICE CONTROL A = A ) s d ) * d * s ) e G*H(IGI J) where the amplitude of the echo of the reflector corresponding to the mark of the DAC curve, the ultrasound path from the converter plate to the reflector corresponding to the curve label, the amplitude of the signal from the tuning reflector, the area of the reflector for which the curve is constructed, the equivalent area of the tuning reflector, path from the converter plate to the tuning reflector, is the amount of attenuation of ultrasound in the material of the monitoring object. For a lateral cylindrical reflector, the amplitude is recalculated in accordance with the equivalent area, the distance to the reflector and the wavelength of ultrasound. The constructed curve will be valid only for the level of gain at which it was built (considering the increase in gain before plotting the curve). ULTRASONIC FLAW DETECTOR - VELOGRAPH II 29

30 MAINTENANCE 5. Maintenance Flaw detector maintenance lies mainly in the electronic device cleaning unit from dust and dirt and periodic battery charging. In case of contamination of the coaxial cable connectors rinse them with alcohol (0.8 g. per one slot), but not more than ½ liter per month Battery charge The electronic unit and PDAs must be charged after 8-10 hours of work. The battery charge is carried out with the charger that comes with the device. The battery is charged via special connector in the electronics housing and PDAs with the charger. Depending on the battery discharge level battery charge can last up to 3 hours. In the process of charging may conduct control without any restrictions. Battery level is displayed on an orange LED display device with a short press on the power button (Fig. 14), each lit LED corresponds to about 25% charge. Implementation of the charging indicator is displayed in red on the back next to the USB-in (Fig. 4). Fig. 14. Indicators of the device state ULTRASONIC FLAW DETECTOR - VELOGRAPH II 30

31 MAINTENANCE 5.2. Periodic maintenance Do not disassemble the device, as this may cause accidental damage to its internal devices. In the event of malfunctions or any questions about the use to contact the company's representatives at the numbers listed in the documentation. During operation, it is recommended to clean the body from dirt and dust with cleaning solution for plastic products Possible malfunctions Ultrasonic flaw detector Velograph II is a complex high-tech product, which is used to create modern solutions that maximize the reliability of the instrument. However, as practice shows, each complex product there is a possibility of failure. Based on the experience of operation of similar products in the table describes the possible situations, the elimination of which may force the device users or their preliminary analysis will accelerate the repair process. Tab. 10. Possible malfunctions Signs of malfunctions Possible reasons Correction methods The indicator does not turn on when you click on the power button of the electronic unit, or does not display any orange division When you try to interface electronic module and the PDA connection status red for more than 6 seconds No signal from the generator, double proube connected No echo-signals from transducer Low battery Loss of the connections with the electronic control unit An incorrect channel generator and / or reamers Low voltage of the generator Charge electronic control unit Turn off and turn on the electronic unit, repeat the pairing Set in sweep generator and the channel that is connected to the transducer Set «High» voltage ULTRASONIC FLAW DETECTOR - VELOGRAPH II 31

32 MAINTENANCE Converter and/or cable malfunction Switch the unfolding in "Radio" mode, make sure that there are no ревибрационный и high-frequency signal by increasing the gain to replace the transducer or cable Echo-signal is weak Inconsistency pulse duration Polluted connectors Switch the unfolding in "Radio" mode, choose the duration of the pulse generator to obtain the maximum amplitude of the ревибрационного signal Rinse connectors with alcohol If you exceed the amplitude of the gate delay time is shown as a dash " " Gate is set in the wedge delay area Adjust the wedge delay time, set the gate delay time in positive / positive coordinate If this does not work, then you need to contact the manufacturer company. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 32

33 TECHNICAL SPECIFICATIONS 6. Technical specifications 6.1. General Operating frequency, MHz 1,5 10 Maximum thicknesses range using echo method (steel), mm 2200 Measuring thicknesses range using echo method (steel), mm 2200 Maximum permissible error of measurement of the thickness of X, (for steel), mm ±(0,01X+0,2) Absolute sensitivity, not less than, db 84 Measuring range of time intervals, mcs 0,1 809,9 Maximum permissible error of measurement of the time interval t, does not exceed, ms ±(0,01t+0,2) Measuring range of defects coordinates (range L and depth H), mm Output accuracy measurements of coordinates of defects (range L and depth H), does not exceed, mm ±(0,03L+1) ±(0,03H+1) The measuring range of the signal amplitudes ratio, db 0 20 Maximum permissible error of measurement of the signal amplitudes ratio N, does not exceed, db ±(0,02N+0,2) Duration of scans settings, mcs Detected signal 25,6 652,8 with 12,8 step Radio signal 6,4 Wedge delay adjustment range, mcs 0,0 80,0 Control area start adjustment range, mcs 0 784,4 The threshold setting alarm limits defects, the percentage of vertical scale screen Adjustment range in the ultrasonic velocity in the material, m/s ULTRASONIC FLAW DETECTOR - VELOGRAPH II 33

34 TECHNICAL SPECIFICATIONS 6.2. Pulser Pulser mode Square-wave pulser Pulse parameters (under 1000 pf, 100 ohm) Pulse width adjustment range, ns 55±10 190±20 Amplitude setting, V 65±5, 115±10 Edge width, does not exceed, ns 23 Pulse repetition frequency, Hz 360± Receiver Receiver bandwidth, MHz 1,5 10 Effective value self-noise, reduced to the input, uv 160±20 Global gain adjustment range, db 0 84 with 1 db step Gain levels absolute accuracy, db ±1 The beginning and the end of time-varied gain (TVG) match the beginning and the end of control area. TVG dynamic range under 0 db global gain, does not exceed, db 84 Input signal amplitude (displayed on device screen with 50% vertical scale amplitude) under 0 db global gain, V 2, Reliability Mean time between failures, does not exceed, h Legal lifetime, years Material capacity indicators Size, mm Weight with battery, g 150 ULTRASONIC FLAW DETECTOR - VELOGRAPH II 34

35 TECHNICAL SPECIFICATIONS 6.6. Environment Operating temperature, 0 С The device must remain operational after exposure to temperatures in the range of, 0 С C C The device must continue to operate in conditions of relative humidity of 98% at a temperature of С. The device must continue to operate at atmospheric pressure changes in a range, kpa 84,0 106,7 The device in the transport packaging must continue to operate after exposure to transport shaking with acceleration of 3g at a frequency of 80 beats per minute to 120 for 1 hour. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 35

36 WARRANTY 7. Warranty The manufacturer carries out free repair for Velograph II device during the warranty period. Warranty period of operation of the device - 2 years from purchase date. The warranty applies to electronic unit. Warranty claims are forfeited if the user is trying to repair their own electronic device components or if the instrument was subjected to violent shocks, as a result of which was the non-repairable. Warranty terms and obligations with the transducers supplied together with the unit, installed separately and are described in their passports to the converters. Ultrasonic flaw detector Velograph II meets the requirements of GOST "Non-destructive testing. Ultrasonic flaw detectors. Basic parameters and general technical requirements. " Unit verification is carried out by organizations that have a legal right to the relevant activities. Calibration interval - 1 year. ULTRASONIC FLAW DETECTOR - VELOGRAPH II 36

37 APPENDIX 1 8. Appendix Software and thickness gauge electronic device Improved equipment kits can include additional software (thickness gauge software), which simplifies the thickness measurement using a Velograph II flaw detector and a direct converter (separately combined or combined). It provides an additional possibility of specifying the allowed thickness values, as well as the sweep of the measured thickness in time. For simplicity of use, most of the adjustment functions are excluded. However, technical specifications (including the accuracy of measurements) are kept equal to the ones in the base kit. Furthermore, the improved kits can include the tiny electronic device with the thickness measuring software installed for even more convenience Electronic device The appearance of the electronic device is shown in Fig. 16. Device is switched on by a long press of the "power" button. Device is charged using the supplied USB cable and the electronic unit charger. To start the program, click on the splash screen and find the corresponding icon in the menu (you can scroll through the menu with your finger up or down outside the icons). Closing programs and exiting the menu is carried out by swiping from the left edge of the screen to the right. 1 1 Power button Рис. 16. Electronic device ULTRASONIC FLAW DETECTOR - VELOGRAPH II 37

38 APPENDIX Управление ПО толщиномера A general view of the software interface is shown in Figure 17. There are 4 modes: thickness display, thickness setting, A-scan, thickness sweep. Switch modes by clicking on their icons in the upper left corner. The functionality of the "On" / "Off" button, the indication of communication with the device and the indication of charging of the device is identical to the basic software (see 3.1, 4.1.1). In all modes, in addition to "setting the allowable thickness", the last measured thickness value is displayed. To perform a thickness measurement, it is necessary to adjust the parameters of the converter, the channels of the generator and the amplifier, the sound speed in the monitoring object in the base software, then exit the basic program and launch the program "Velograph_II_t". Conduct the interface with the device (similar to 3.1), then produce a thickness gauge. Or use the automatic setting function (see 9.3.2). Simultaneous connection of the electronic unit of the flaw detector with two different devices is impossible. Disconnect the program in advance or connect to the device in the running program if you are switching to using another device (PDA) Рис. 17. Display after pairing with main block ULTRASONIC FLAW DETECTOR - VELOGRAPH II 38

39 APPENDIX Thickness display mode The measured thickness and thickness diagram are displayed (Figure 18). If the measured thickness is less than the specified minimum allowable value, the bar chart is displayed in red. If the thickness exceeds the set maximum allowable value, the bar chart is displayed in blue. In other cases, the strip of green color. Рис. 18. Thickness display mode Thickness setting mode Adjustable in this mode, the smallest and largest thicknesses can have one of two functions: The border of the displayed thickness Allowable thickness value The functions are switched by clicking on the check mark to the left of the thickness value (the checkmark corresponds to the function of the allowable value) (Figure 19). If a thickness boundary is specified, the diagram in the thickness display mode and the thickness sweep will start (end) with this value and will not be painted at all (it will be completely covered with green instead of blue) if the thickness is less (larger). Also, the value of the range expansion is set lower (higher) than the permissible thickness in percent from the difference between the maximum and minimum thicknesses. Expansion is possible from 0% to 200%. To set values, click on them, enter the changed value, and click "Next" or "Finish". ULTRASONIC FLAW DETECTOR - VELOGRAPH II 39

40 APPENDIX 1 These values do not affect the thickness measurement and its displayed value. They are only used for plotting the scale of the chart and the scale of the thickness sweep. The button "Settings" starts a step-by-step scenario of automatic adjustment of the parameters of the direct converter and the speed of sound on the tuning sample. When using a direct combined converter, you must first connect it to the first socket. While the script is running, the mode will be switched to "Ascan". In the query "The type of PEP used" it should be ticked "separatelycombined" for the appropriate type of converter, and not set for a combined converter. Рис. 19. Thickness setting mode A-scan mode An A-scan is displayed with a scale of whole millimeters (tens of millimeters) without signatures (Figure 20). The lines corresponding to every tenth (one hundredth) millimeter are wider. A gate is also displayed, the intersections of which determine the signal times, the GVH curve (if it was built), and the tuned speed of sound. The speed of sound can be adjusted manually, by clicking on its value and entering a new value. Control of sweep and strobe is not provided, for this use the basic software on the PDA. Рис. 20. A-scan mode ULTRASONIC FLAW DETECTOR - VELOGRAPH II 40

41 APPENDIX Thickness sweep mode The sweep of the measured thickness is displayed, with a scale in whole millimeters (Figure 21). The colors of the regions are similar to the colors of the thickness diagram. Valid thicknesses values (if set) are displayed in dashed lines of the corresponding color. Updating of a sweep with new measurements is carried out only when this mode is enabled. Рис. 21. Thickness sweep mode ULTRASONIC FLAW DETECTOR - VELOGRAPH II 41