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Elcometer BG80DL, Руководство по эксплуатации

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9

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7.4 RF A-SCAN MEASUREMENT SCREEN

The RF view shows the full sound wave as received by the gauge. The vertical
axis indicates the amplitude of the received wave and the horizontal position
indicates the time it is received, which is converted into thickness units using the
material velocity. The point on the scan that is being used to calculate  the bolt
length  is displayed as the vertical dashed line (see section 9 on gates). The RF
screen is used for gauge setup prior to inspection

7.5 RECT A-SCAN MEASUREMENT SCREEN

The RECT display is similar to the RF display but shows only half of the
waveform.
Either the positive or negative peaks are shown, depending on the polarity
selected. The correct polarity is typically determined by first using the RF display
to select the optimal phase.
The detection point is indicated by the same vertical dashed line as shown in the
RF display.
The gate is indicated by the same solid horizontal line as shown in the RF display.
The waveform can be filled or unfilled - see “RECT WAVEFORM” on page 41.

7.6 DIGITS MEASUREMENT SCREEN

The digits display shows the measurement quantity and
its value in a large font size. The current temperature of
the bolt is also displayed.
If ALARM STATUS is enabled and you are in a
measurement location other than column A of a group
data file (column A always contains the bolt reference
length), the digits view also shows a limits bar. The limits
bar, in conjunction with the alarm lights, allows you to see
quickly and easily whether the fastener is within
tolerance without having to constantly watch the digital
readout for a target value to appear.
This view is used typically once the initial setup of the
gauge is complete.

7.7 CHANGING THE VIEWABLE RANGE

In RF view and RECT view, if the waveform around the
detection point is not visible on the display, use one of the following methods to adjust the viewable range
of the display:
•

Use the Auto Set function - see “Auto Set” on page 29. This is the preferred option and provides a
quick and easy method of adjusting the viewable range.

•

Change the values of the DELAY and WIDTH functions until the measurement falls inside the viewable
range of the display - see instructions below.

G

Hot Menu

The hot menu contains a selection of the most commonly used 
options, allowing you to conveniently adjust these to your needs while 
the graphical display is active

With

ALARM STATUS

disabled

With

ALARM STATUS

enabled

Содержание BG80DL

Страница 1: ...en Models BG80DL BG80TDL Tension Monitor Operating Instructions ...

Страница 2: ...rroneous readings may be given If this occurs tests should be repeated at another location All other trademarks acknowledged Material Safety Data Sheets for the ultrasonic couplant supplied with the BG80DL BG80TDL and available as an accessory are available to download via our website Elcometer NDT Ultrasonic Couplant Material Safety Data Sheet www elcometerndt com images MSDS elcometer_ultrasonic...

Страница 3: ... Bolt Material Calibration 19 11 Load Measurement 23 12 Measurement Taking Readings 27 13 Using the Gate 28 14 Interpreting the Waveform 29 15 Measurement Options 30 16 Measurement Recording your Readings 32 17 Gauge Setups 34 18 Data Transfer Software 36 19 Storage 37 20 Maintenance 37 21 Technical Specification 37 22 Warranty 38 23 Spares Accessories 38 24 Transducers 39 25 Sound Velocities of C...

Страница 4: ...gauge can be used in accordance with the following Standards and test methods ASTM E 797 EN 14127 and EN 15317 1 2 WHAT THIS BOX CONTAINS Model BG80TD or BG80TDL Bottle of couplant Battery 3 x Carrying case Test certificate Operating instructions CD with software to enable you to transfer your readings and settings to and from a PC RS232 cable and USB to serial converter Note The box does not incl...

Страница 5: ...play options RF RECT or DIGITS Scrolls backward through the Hot Menu functions Navigation Keys In menus this key activates list and edit boxes displays and saves measurements to bolt group locations While making measurements displays the group log file This key has two completely different functions Reference Lengths When measuring reference lengths press to locate automatically the detection poin...

Страница 6: ... its simplest form to measure elongation This quick start example uses a preset material type and does not include zeroing the transducer because the transducer is not zeroed you will not be able to re measure the fasteners at a later date typically to monitor relaxation of a joint over time Note When positioning the transducer to measure an elongation ensure that you place the transducer in exact...

Страница 7: ...er system can send the maximum amount of energy to the ultrasonic transducer allowing the broadest possible range of transducers for a given application The low noise and gain features of the receiver system allow signal detection and measurement in the most difficult applications The digital signal processor optimises the measurement process 4 2 ULTRASONIC WAVES Ultrasonic measurement requires th...

Страница 8: ...nd the bolt end This is accomplished more easily with a liquid that is viscous enough to stay in place Very viscous substances however can create such a thick layer between the transducer and bolt that measurement errors occur Also viscous substances can trap air bubbles which prevent adequate energy transmission The ultrasonic couplant provided with your gauge works best Apply only the smallest q...

Страница 9: ...e reflecting end of the bolt are listed below Note Misalignment exceeding 2 degrees can cause significant errors Rough or curved bolt end Most of the reflected energy will be dispersed and a weak or distorted echo will be received Bolt end not perpendicular to bolt axis Sonic energy will be reflected towards the sidewall of the bolt Bent bolt A curved bolt axis results in sonic energy being reflec...

Страница 10: ...el fasteners Therefore the worst case error is 5 When measuring in terms of Load Stress or Strain however the error can be enormous if errors in effective length load factor or cross sectional area are made These factors will result in proportional errors overall Therefore if the load factor is in error by 10 the load measurement will also be in error by the same 10 Press MEAS once to access the m...

Страница 11: ... digital thickness values displayed When all the vertical bars are fully illuminated and the last digit on the digital thickness value is stable your gauge is reliably measuring the value C Measurement Quantity Time Elongation Load Stress or Strain D Units The units of the current measurement quantity E Measurement View Area RF RECT or DIGITS view area type depends upon measurement view F Measurem...

Страница 12: ...uantity and its value in a large font size The current temperature of the bolt is also displayed If ALARM STATUS is enabled and you are in a measurement location other than column A of a group data file column A always contains the bolt reference length the digits view also shows a limits bar The limits bar in conjunction with the alarm lights allows you to see quickly and easily whether the faste...

Страница 13: ...isplay as possible B START and B DEPTH are analogous to DELAY and WIDTH or a B SCAN display respectively DELAY and WIDTH or B START and B DEPTH may be adjusted in the hot menu or in the DISP section of the main menu 7 8 GAIN The GAIN the amplitude of the received echo can be adjusted to suit a variety of applications To obtain valid readings the gain must be set to the correct level to give reliab...

Страница 14: ...The green light illuminates when the alarm mode is active and the measured thickness is within limits The red light illuminates when the alarm mode is active and the measured thickness is less than the alarm low value or the measured thickness is greater than the alarm high value To set and adjust the alarm see Alarm Mode on page 30 8 MEASURING SYSTEM ZERO CALIBRATION 8 1 INTRODUCTION System zeroi...

Страница 15: ...lished can be used as a simple and effective calibration standard Although this sounds like an economic method you should bear in mind that certified calibration standards are usually inclusive of an ultrasonic length velocity and temperature coefficient and are certified according to a specific set of standards The following procedure outlines how to use a standard bolt Create a group in which to...

Страница 16: ... not use this function If the hardware has not changed only the temperature value should be adjusted to match the existing zero values Performing a Probe Zero Calibration 1 Select MENU CAL ZERO OPTION 2 Use LEFT and RIGHT to adjust ZERO MODE value to ONE POINT 3 Select MEASURE ZERO and press ENTER The ONE POINT ZERO Edit Box is displayed 4 Highlight PHYSICAL LEN press ENTER and adjust to match the...

Страница 17: ...terchanged between units and calibration bars blocks While the 3 and 6 bars provide two specific points to demonstrate linearity the triple sided glass block has a third reference point The glass block has a 1 2 and 3 reference Generally you will set up the two point calibration on the 1 and 3 sides first and use the 2 side for additional verification purposes This section explains the procedure f...

Страница 18: ...ox In order for the gauge to display the correct measurement value during calibration the material velocity and temperature coefficient must be set to the same values as in the calibration section 1 Select MENU MATL VELOCITY 2 Adjust the VELOCITY and TEMP COEFF to match those used in calibration 3 Set the STRESS FACTOR to 1 000 Before the probe zero is calculated the calibration bars glass block n...

Страница 19: ...he cursor to the desired storage location Note Since these are the first calibration bar measurements taken the measurements have to be stored in column A In fact the most logical approach would be to store the 3 bar in A1 and the 6 bar in A2 However if the glass block is the standard store the 1 side in A1 2 side in A2 and the 3 side in A3 17 Place the transducer on the 3 calibration bar in exact...

Страница 20: ...eater than 0 0001 and therefore out of specification proceed to step 9 8 Repeat steps 2 to 7 for the other probe zero calibration standards If all the elongations are within specification the probe zero verification procedure is complete 9 If an elongation is out of specification press MEAS to return to the measurement screen and then complete steps 10 to 12 below for all elongations out of specif...

Страница 21: ...ress ENTER to open the Digits Edit Box 4 Press OK to confirm or ESC to cancel 9 3 TEMPERATURE COMPENSATION SEMI AUTOMATIC MODE 1 Select MENU UTIL TEMP MODE and use LEFT and RIGHT to scroll the TEMP MODE to SEMI 2 Press MEAS to return to the measurement screen 3 In the hot menu highlight the temperature field press ENTER and the Digits Edit Box will display the live temperature Press OK to accept t...

Страница 22: ...th in the gauge The Sonic Stress Factor is calculated using the following equation where The procedure in this section describes how to determine the Sonic Stress Factor for bolts of a specific bolt material and specific geometry by measurement of the change in bolt length To complete this procedure you will need the following equipment A laboratory or room in which the temperature can be maintain...

Страница 23: ...n the loading apparatus Apply approximately 1 3 of the maximum load which is to be placed on the bolt under actual working conditions Using the mechanical measuring device measure and record the Mechanical Length at Load 1 for the current sample bolt 5 Apply the transducer and couplant to the bolt and measure and record the Ultrasonic Length at Load 1 6 Increase the applied load to approximately 2...

Страница 24: ...and ideally suited for this function However a simple and inexpensive method can be achieved by immersion of the sample bolts in a water bath which can be heated to boiling or cooled by adding ice At sea level this will reliably vary the bolt temperature between approximately 9 C to 42 C 48 F to 108 F depending on water purity and atmospheric pressure By measuring the temperature of the stirred wa...

Страница 25: ...oints per bolt 11 LOAD MEASUREMENT 11 1 CALCULATING A LOAD FACTOR The load factor is an empirically determined value for the geometry of the bolt It is the amount of load required to elongate the bolt 0 01 mm in metric units 0 001 in English units The accurate load factor for the bolts being measured is determined by the Calibrate Bolt function An approximate value of this geometry dependent facto...

Страница 26: ...ach individual area and length In the case of a hollow fastener the area of the hole must be subtracted from the overall area The area of a fastener with complex geometry can be estimated as follows where Area of a region Length of a region The value for the Modulus of Elasticity E should be provided directly from the manufacturer of the bolts The effective length is the average length of the fast...

Страница 27: ...IBRATING A LOAD FACTOR FIELD CALIBRATION Clearly the most effective way of calibrating the load factor is by performing a field calibration Material constants are often unknown or cannot be calibrated in a laboratory environment In cases such as these a field calibration is the most accurate means of calibration A field calibration is accomplished using a tensile tester load cell or other calibrat...

Страница 28: ...ettings to a cell location in the group for easy recall at a later time This will allow you to easily verify the field calibration data To create a group read the notes below and then follow the instructions given in Creating a New Data logger Group File on page 32 When you create the group give it a NAME and NOTE which describe and make reference to the Field Calibration data and bolt A group can...

Страница 29: ...n group cells A2 to D2 12 Repeat steps 1 to 10 for sample bolt 3 Store the values in group cells A3 to D3 11 3 5 Calculate the load factor 1 Select MENU CAL LOAD CAL CALC 2 Press ENTER The vector or regression calculation is performed and the coefficient is displayed Note The closer this number is to 1 the better the fit or least amount of error 3 Press OK to accept the calculation or ESC to cance...

Страница 30: ...is happens take the reading again using less couplant 13 USING THE GATE Your gauge is equipped with a gate typically used to eliminate noise that may be present prior to the reflection off the end of the bolt and also to force a detection at or on a specific location or waveform Often the first reflection off the end of the bolt will produce a poor signal However if you look further out in time le...

Страница 31: ...e the gauge to use the mode conversion reflection C instead of B Once again the same gain and threshold tools can be use for fine adjustment and signal optimisation 13 1 ADJUSTING THE GATE The quickest way to adjust GATE is directly from the hot menu Alternatively adjust the value using the menus 1 Select MENU AUTO GATE 2 Use LEFT and RIGHT to scroll the value 3 Alternatively press ENTER to displa...

Страница 32: ...eight of W1 it has a much lower amplitude than W2 Therefore when stress was applied to the bolt the amplitude of W1 was decreased beyond the threshold A and the gauge jumped to the next available signal with sufficient amplitude However this could never happen in Fig 1 This is because W1 has more amplitude than W2 and a peak jump could never occur without losing the signal entirely Note Always loo...

Страница 33: ...tating it each time to obtain the minimum value measured Be sure to always place the transducer in the same location This will help to eliminate any potential measurement errors caused by changing the sound path 2 Press AUTO SET The display settings are adjusted automatically and the waveform is brought into view on the measurement screen Method B 1 Press MENU scroll to the UTIL menu and then high...

Страница 34: ...to achieve optimal results Low frequency applications where more penetration is a requirement may require the Thin or Wide settings offering increased penetration The variety of transducer frequencies and diameters used in conjunction with the pulse width setting enable you to fine tune the gauge to your application needs To adjust the Pulse setting 1 Press MENU TUNE PULSE 2 Use LEFT and RIGHT to ...

Страница 35: ...djust the number of bolts 5 Repeat the method for the NUM READS number of readings per bolt 6 Choose the INCR DIR using LEFT and RIGHT Note Determines the direction the cursor moves when a reading is stored 7 When complete highlight CREATE NEW GROUP and press ENTER 8 Press MEAS to return to the measurement screen 9 The measurement screen is displayed The name of the group log file is displayed in ...

Страница 36: ...o the EDIT function and press ENTER The Edit List Box is displayed The two fields which can be edited are highlighted the others are greyed out 3 To adjust the INCR DIR field scroll to the field and then use LEFT and RIGHT to adjust the value 4 To adjust the NAME field scroll to the field press ENTER and then adjust the contents of the field using the techniques previously described to create a da...

Страница 37: ...ion you can save these setting to a specific setup location for future use It is sometimes necessary to rename a previously saved setup or add additional comments about a particular setup The setup name may have been entered incorrectly or you may need to use the setup for a completely different project An inspector s name or other comments about the project may also be required for additional doc...

Страница 38: ...nect directly from the gauge to a standard AT serial port on a PC A Lemo to 9 pin serial cable is supplied with the gauge Note This connector is also used to upgrade the gauge with the latest version of firmware 18 1 2 USB to Serial Converter Some newer laptop computers do not have standard serial ports In this case use the USB to Serial converter supplied with the gauge 18 1 3 Computer System Req...

Страница 39: ...the transducer down so that it is perpendicular to the panel surface Dragging the transducer along the surface will reduce the life of the transducer Replacement transducers are available from your local Elcometer NDT supplier or directly from Elcometer NDT 21 TECHNICAL SPECIFICATION Note Alkaline cells must be disposed of carefully to avoid environmental contamination Please consult your local en...

Страница 40: ...r province to province 22 2 OBTAINING SERVICE DURING WARRANTY PERIOD If your hardware should fail during the warranty period contact Elcometer NDT and arrange for servicing of the product Retain proof of purchase in order to obtain warranty service For products that require servicing Elcometer NDT may use one of the following methods Repair the product Replace the product with a re manufactured un...

Страница 41: ... Couplant 360 ml 12 oz TC 24034 2 Note A wide range of other transducers and accessories is available see www elcometerndt com for details 23 4 MISCELLANEOUS Description Sales Part No RS232 Cable USB to Serial Converter TL 24031 24 TRANSDUCERS Transducer selection is a very important part of getting the best results from your gauge The frequency and diameter of transducer should be carefully selec...

Страница 42: ...39 en For full details of the Elcometer NDT range of transducers contact your local Elcometer NDT supplier or visit the Elcometer NDT website www elcometerndt com ...

Страница 43: ...an 5232 0 206 PVC 2388 0 094 Copper 4674 0 184 Quartz Glass 5639 0 222 Epoxy Resin 2540 0 100 Approx Rubber Vulcanised 2311 0 091 German Silver 4750 0 187 Silver 3607 0 142 Glass Crown 5664 0 223 Steel 5918 0 233 Glass Flint 4267 0 168 Steel Stainless 5664 0 223 Gold 3251 0 128 Stellite 6985 0 275 Approx Ice 3988 0 157 Teflon 1422 0 056 Iron 5893 0 232 Tin 3327 0 131 Lead 2159 0 085 Titanium 6096 ...

Страница 44: ...ession or vector curve once the LOAD CAL MODE is enabled and known and ultrasonic loads have been entered and ultrasonically measured If the REGRESSION option is selected in LOAD CAL MODE a correction load offset and load factor is calculated If the VECTOR option is selected a load factor is calculated and the off set is set to zero MATL material UNITS Toggle between Metric and English units and m...

Страница 45: ...according to time which is converted to length in millimetres or inches WIDTH Set the overall depth of the viewable measurement area It functions a lot like a zoom on a camera TUNE GAIN Increases or decreases the overall amplitude of the signal Gain is similar to the volume control on a stereo receiver THRESHOLD Sets the sensitivity level of the gauge The amplitude of the signal must reach or exce...

Страница 46: ...all groups currently stored in memory UTIL utilities TEMP MODE Selects the automatic temperature compensation mode MANUAL SEMI AUTO AUTO ALARM STATUS Toggles alarm mode ON or OFF ALARM LO LIMIT Sets the LOW limit parameter If the measurement falls below this value a red light will illuminate and the alarm will sound ALARM HI LIMIT Sets the HI limit parameter If the measurement exceeds this value a...

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