PosiTector UTG Ultrasonic Thickness Gage INSTRUCTION MANUAL v. 2.2 for UTG ME models Simple. Durable. Accurate.
Introduction The PosiTector UTG ME is a hand-held Ultrasonic Thickness Gage that uses the non-destructive ultrasonic pulse-echo principle to measure the wall thickness of a wide variety of materials. The default and most common setting for the PosiTector UTG is multiple-echo (ME) mode. In ME mode the Gage measures the metal thickness of a painted structure, disregarding the paint thickness. The user can switch the gage to single-echo mode by selecting SE Mode from the Gage menu (see pg.15).
sound than that of metal. Thus the single-echo technique will produce a thickness result greater than the actual combined coating+metal thickness. t2 t3 Probe t1 t1 t2 t3 Coating Probe In multiple-echo mode the Gage determines thickness by measuring the time between at least three consecutive back wall echoes. steel Figure 2 In the figure above, multiple-echo mode measures only the time between echoes. Regardless of whether the steel is coated or not, all times between echoes are the same.
Typical Display Currently selected material Measurement Mode Currently set to ME Steel Battery Icon inch Current Measurement The Coupled Symbol appears when the probe is ultrasonically connected with a surface.
NOTE: Throughout this manual, the symbol indicates more information about the particular topic or feature is available on our website. Go to: www.defelsko.com/manuals Power-up / Power-down The PosiTector UTG powers-up when any button is pressed. To preserve battery life, the Gage powersdown after approximately 3 minutes of no activity. All settings are retained. How to Measure 1. Remove black rubber cap from probe if supplied.
Surface Conditions Ultrasonic measurements are affected by the condition, roughness and contour of the surface to be tested. Measurement results may vary on coarse surfaces. Where possible, it is recommended to seat the transducer on a smooth flat surface that is parallel to the opposite side of the material. On rough surfaces, the use of a generous amount of couplant minimizes the surface effects and serves to protect the transducer from wear, particularly when dragging the probe across a surface.
Important: DO NOT place probe on the Zero plate until Step 4. 1. Make sure the Gage is on and the probe is wiped clean. 2. Apply a single drop of couplant onto the zero plate located on the underside of the Gage. DO NOT apply couplant directly onto the probe face. 3. Select the Zero menu option (LCD will display image shown in Figure A). Hold the probe in the air and press the button to select OK to continue. 4. When the image shown in Figure B is displayed, press and hold the probe against the zero plate.
To navigate, press (-) to scroll DOWN, (+) to scroll UP and to SELECT. Press both (-)(+) buttons at any time to exit any menu or select Exit from the Menu. List boxes have a down arrow on the right-hand side. Use the (-) and (+) buttons until your desired choice appears, then press to select this choice and move focus onto the next item. “List“ box a “tick” indicates this square box has been selected “Radio” buttons. Only one can be selected at a time.
standards and verifying that the results are within the stated accuracy of the Gage. Calibrations are typically performed by the Gage manufacturer or by a certified calibration laboratory in a controlled environment using a documented process. Certification: All PosiTector UTG instruments ship with a Certificate of Calibration. For organizations with re-certification requirements, gages may be returned at regular intervals for calibration.
micrometer. If the Gage does not measure the sample within the combined tolerances of the Gage and the micrometer, the Gage can be adjusted (see below). For best accuracy this process should be repeated if the temperature of the part changes substantially. To guard against measuring with an improperly adjusted Gage, verify the Gage at the beginning and the end of each work shift. During the work shift, if the Gage is dropped or suspected of giving erroneous readings, its accuracy should be reverified.
premise of adjusting the sound Thickness velocity. The first three adjustment methods make 1Material point calibration adjustments to Velocity optimize the linearity of the 2 Pt Adjust Gage over small ranges. The fourth method makes a 2-point calibration adjustment to allow for greater accuracy over a large range. Thickness The most common method of adjustment is to measure a sample of known thickness. Select a reference standard of material as close as possible in composition to the intended application.
Velocity If the sound velocity for the test material is known, the Gage can be adjusted to that specific sound velocity by performing the following steps. 1.Select the Cal Adjust Velocity menu option. 2.Adjust the display down (-) or up (+) to the desired velocity. Holding the (-) or (+) buttons increases the rate of change. 3.When the desired velocity is reached, press to store the adjustment and exit.
Memory Management Memory The PosiTector UTG can record 10,000 measurements in up to 1000 groups (batches) for on-screen statistical purposes, printing to an optional IR printer, or for downloading to a personal computer (optional PosiSoft software and USB cable required). New Batch Closes current batch and creates a new batch name using the next higher number. For example, if only Batch 1 and Batch 3 exist, then Batch 4 would be created and made the current batch.
Close Stops the recording process, closes the current batch, and removes the statistics from the display. Delete Removes a batch completely from memory. The name is deleted and all measurements are erased. View Lists all readings on the display from the current or most recently used batch. It begins by showing the last 10 measurement values. Scroll using the (-) or (+) buttons. Hold for 1 second to scroll a page at a time.
Single Echo Mode SE Mode ✓ The default and most common setting for the PosiTector UTG is multiple-echo mode The user can switch the gage to single-echo mode by selecting SE Mode from the Gage menu - To detect pits and flaws - To increase the measurement range - To obtain thickness measurements in circumstances where multiple-echo can not Shortcut: Press (-) to quickly toggle between ME and SE measurement modes.
Setup Menu Setup Reset Reset restores factory settings and returns the Gage to a known, out-of-the-box condition. It is handy when you want to “start all over”. The following occurs: - all batches are closed and stored measurements are erased. - calibration adjustments are cleared and returned to the Gage’s factory calibration settings.
Application Notes Measuring on hot surfaces Measurements taken at higher temperatures (above 100° C / 212° F) require special consideration. Both material sound velocity and probe zero will change with temperature. For maximum accuracy at high temperatures, adjustment should be performed using a material of known thickness heated to the temperature where measurements are to be performed. The probe should remain on the surface only as long as it takes to get a measurement.
Gage displays -.-- (dashed lines) when measuring on an smooth uncoated surface in ME mode See ME Mode Note, pg. 6 Measurement jumps as probe is lifted from surface Occasionally, excess couplant will remain on the probe when the probe is lifted from the surface. This may cause the PosiTector UTG to display a final measurement value different from those observed when the probe was on the surface. Discard this value and repeat the measurement.
Returning for Service Before returning the Gage for service… 1.Install new Alkaline batteries in the proper alignment as shown within battery compartment. 2.Examine the probe tip for dirt or damage. 3.Perform a Reset (pg.16) and a Zero (pg.6) If you must return the Gage for service, describe the problem fully and include measurement results, if any. Be sure to also include the probe, your company name, company contact, telephone number and fax number or email address. Website: www.defelsko.
Available Options A variety of accessories are available to help you get the most from your PosiTector UTG ultrasonic thickness gage. Limited Warranty, Sole Remedy and Limited Liability DeFelsko's sole warranty, remedy, and liability are the express limited warranty, remedy, and limited liability that are set forth on its website: www.defelsko.com/terms www.defelsko.
