OPERATORS MANUAL DELTA SIGMA Ultrasonic instrument
34Pages

Document No: DELTA SIGMA-USM Version 4 Revision 0.3.101

Document No: DELTA SIGMA-USM Version 4 Revision 0.3.101

When a fastener is loaded (tightened) or unloaded (operational loss or disassembly) the ultrasonic TOF will change due to the change in load (tension stress) in the fastener. It is this change in TOF that we use to calculate load, by storing a “Reference” length or time and calculate the difference between that “Reference” time and the “as found” time. This delta time is directly proportional to the load or stretch in the fastener. <—i —I " \ During tightening the fastener elongates with load - h — - h- Pulse K- Echo Loading the bolt creates stretch and lowers the velocity, increasing the...

The Δσ pulse-echo ultrasonic time-of-flight measurement device; measures, displays, stores and transfers bolt load data. The Delta Sigma uses a sealed colour touch screen for all operator I/O. All data is entered and presented on a 4.3” colour, resistive touch screen. Data and digital signal traces are stored for later display and transfer. The unit has automatic temperature compensation from an included magnetic temp probe. For data integrity, the DS memory is divided into a secure sector (A) for all bolt data and a public sector (B) for transfer via USB to a computer. The unit...

Document No: DELTA SIGMA-USM Version 4 Revision 3.94.2

A joint is a structure that contains a collection of bolts whose purpose is to hold the structure together through the combined clamping force of the bolts on the joint. These bolts can all be the same size or may be of different diameters and lengths (types). The data structure used in the DS is setup to accommodate this logical bolted joint structure. The Project file includes the basic joint information and stores the Length, Stretch and Load data. The DS requires geometric, ultrasonic and material information specific to a type of bolt to determine the load ultrasonically. This...

On receipt of your DS the batteries should be charged, plug in the included charger. A flash symbol will replace the battery status bar showing that the unit is charging. Turn unit on and leave charging for 12hrs. After 5 minutes of inactivity the display will shut off but the charger will stay on, it will shut down when fully charged. The blinking red LED designates charging mode. Above is the DS start up screen. The time can easily be set by pressing the active Time & Date button. Here you can easily adjust the time and date if you are in another time zone The instrument is now ready to...

On your first screen you have an option to press SETUP in order to configure the Delta Sigma. FILE BACKUP: You can backup your files. By entering this option you can select what projects you need to backup to drive B ERASE FILES: If you need to delete all stored data, Choose the the data you want to delete. If you then press YES, the data will be deleted. This operation cannot be reversed. MAINTENANCE: Factory settings only: password required. CALIBRATION: Enter this option if you want to calibrate your DS SECURITY: Lock-Out function for bolt-data settings. Password is: 1 2 3 4. • OPTIONS:...

The DS will automatically continue the previously run project. If there are no projects stored in the DS, the screen will show "No projects" before going to the Project List screen as shown on page 8. Selected Project: Select New Project' View or change " project info Selected Bolt: . Select New Bolt __View or change Displayed Bolt Data info Selected Bolt Type: Select New Bolt' Bolt has not been measured View or change ' Project Data Measure Selcted Bolt If this is your current project, press the MEASURE button. To select a different project or start a new project, press the Selected...

Enter Project Name and confirm by pressing ENTER. You then get a question if you really want to create a new project or not. If you do, press YES. If you do not, press NO and you will return. Enter Operators name and confirm by pressing ENTER. □pifrratGr: Bill Choose Units and press NEXT. Enter comments, if any. Once you press SAVE button the project is saved. If you want a short report: Press short If you want a long report: Press long All data is stored in the DS so this is changeable. This can be changed at a later stage. If Expert mode is enabled, the “Master Bolt Option” that can be...

Bolt Type: lest Bolt Choose bolt type or enter a new type by pressing the empty Bolt Type: button, and then NEW. If you assign or create a new bolt type: Name the new type and press ENTER to continue. You will then get a question if you want to create a new bolt type. Press YES, if you want to stop press NO. Set bolt and measuring properties. 5MHz is standard for most magnetic transducers. 7,5MHz is standard for most glue-on transducers. If the bolt material is listed, select it and you can press SAVE or you can press the NEXT button for options shown below. Stress and Temperature Factor...

Enter limits to turn on internal buzzer and digital SSR in I-O port. The velocity factor of the selected material in screen 1 will appear. The material velocity for different bolt materials is in Appendix A. Press NEXT. Enter the number of pulses and mode and save the bolt type by pressing the SAVE button. You will return to the Bolt Information Screen. The number of pulse cycles used to excite the transducer is a function of transducer frequency and size. For most applications 2 cycles is sufficient. For very long fasteners, large diameter, low frequency transducers and difficult...

2.5 MEASURE BOLTS You are now ready to do measurements. Attach the transducer to the bolt. Make sure to apply a thin layer of ultrasonic couplant between the bolt and transducer and carefully rock the transducer onto the center of the bolt head or end. Then press MEASURE. Please note: There can be no air gap between the transducer and the bolt. Ultrasound do not travel in air. If the bolt surface has protruding marking, this must be grinded down or otherwise removed. Please see YouTube video on bolt ends and surface roughness. If no temperature probe is attached, press the temperature...