OFFSET FUNCTION - Troxler Electronic Laboratories
Contents
1. Mark the test area Remove the drill rod by pulling straight up on the drill rod extraction tool Do not loosen the drill rod by moving it from side to side 4 DRILL ROD tC CC Ce lt Place the gauge on the smoothed surface Insert the source rod into the hole Release the trigger in the gauge handle and lower the source rod to the correct depth A click should be heard when the source rod is locked into position Gently slide the gauge toward the keypad so the source rod touches the side of the hole 42. 17 xM where M moisture in pcf or Depth mm 280 0 27 xM where M moisture in kg m STORAGE FUNCTION Assign a project number before storing readings by pressing PROJ Select the desired option from the displayed menu To store readings press STORE Follow the gauge prompts to enter any additional project information 6 Model 3430 Plus amp 3440 Plus Surface Moisture Density Gauge QUICK REFERENCE CARD A TROXLER e Leader in Construction Testing Equipment Troxler Electronic Laboratories Inc 3008 Cornwallis Rd e P O Box 12057 Research Triangle Park NC 27709 Phone 1 877 TROXLER Outside the USA 1 919 549 8661 Fax 1 919 549 0761 www troxlerlabs com PN 110888 March 2006 Edition 1 0 GAUGE START UP NOTE The operator should wear a dosimeter or radiation badge when working with the Model 3430 Plus or 3440 Plus Surface Moisture Density Gauge To turn on the gauge press the power switch Upon power up the gauge briefly displays the model number software version and serial number It then performs a brief self test followed by a display test Following the two tests the gauge enters a 300 second warmup period then displays the Ready screen READY 04 08 2006 12 21 PM Prj TROXLER Press lt START gt NOTE The symbol o in the upper right of the display indicates that the GPS option is installed the option is enabled and the gauge is receiving GPS satellite signals Thi
3. ASPHALT OR HARDENED CONCRETE SITE NOTE These directions also apply to taking a backscatter measurement on soil Locate a smooth site on the asphalt Fill the voids on open mixes with sand or cement ensuring that the total area filled does not exceed approximately 10 percent of the bottom area of the gauge The gauge base must rest on the asphalt not the fill material Ensure that the gauge does not rock To ensure accurate readings the gauge base must be completely in contact with the test material If the gauge rocks find a more suitable test site If taking a measurement around a core the gauge may be moved a few inches from the core to level it OFFSET FUNCTION The gauge can be adjusted using an offset The gauge applies the offset to measurements until the offset is disabled or the gauge is turned off The gauge provides three offsets density moisture and trench Press OFFSET to access the Offset menu DENSITY OFFSET To use a density offset press 1 from the Offset menu The Density Offset menu shows the current density offset on the second line Press 1 to enable the displayed density offset or 2 to disable it To enter a new density offset press 3 The gauge prompts for the density offset Select the offset sign positive or negative enter the density offset and press ENTER MOISTURE OFFSET To use a moisture offset press 2 from the Offset menu The Moisture Offset menu shows the four stored offs
4. et values if any and the New and Disable options To select a stored offset value press the number key that matches the displayed value To enter a new offset value press 5 At the Select Offset Source prompt press 1 to enter a moisture offset manually or 2 to allow the gauge to derive the offset value Follow the gauge prompts to enter or derive the offset value Upon completion the gauge displays the prompt Save This Value for Later Use Press NO to enable and use the offset without storing it or YES to enable the value and store it in memory The gauge can store the value in one of four memory cells Storing a new value in a cell will erase the old value At the Select memory cell prompt use the number keys to store the value To disable the moisture offset press 6 from the Offset menu 5 TRENCH OFFSET To use a trench offset press 3 from the Offset menu The Trench Offset menu shows the current offset values on the second line To enable the displayed trench offset press 1 To disable the trench offset press 2 To enter a new trench offset press 3 As prompted by the gauge select a position inside the trench and the same distance from the wall as the test measurements Place the gauge on the standard block in this position set the source rod to the SAFE position and press ENTER START The gauge performs a trench count calculates the trench moisture and density offset values enables the trench off
5. mory cells Storing a new value in a cell will erase the old value At the Select memory cell prompt use the number keys to store the value To disable the target value press 6 THE STANDARD COUNT To compensate for the source decay and to check proper operation of the gauge take a standard count each day that the gauge is used Place the reference standard block on a dry flat surface of asphalt concrete or compacted soil at least 10 cm 4 in thick The location should be at least 3 m 10 ft from any building or vertical structure and 10 m 33 ft from any other nuclear gauge or radioactive source Ensure that the top surface of the reference standard block and bottom of the gauge are clean of debris As shown at left place the gauge between the grooves on the reference standard block Place the source rod on your left and the right side of the gauge against the metal butt plate on the block n n NOTE h Ensure that the source fl rod is in the standard SAFE position by firmly tapping down on the handle of the source rod Press STD The gauge displays the last standard count To take a new standard count press YES With the gauge in the standard count position press ATEA ENTER START to l Pa A REFERENCE begin the standard count STANDARD lt BLOCK 3 After taking a 240 sec standard count the gauge display
6. s option is available only on the Model 3440 Plus GAUGE SETUP COUNT TIME To change the current count time length of measurement press SETUP to display the Setup menu Press 1 to access the Count Time function Use the numeric keys to select the desired count time SET UNITS The gauge can display measurement results in either U S units pcf or metric SI units kg m or g cm To select the units press SETUP to display the Setup menu Press 2 to display the Units menu Select the new units using the corresponding number key TARGET VALUES To select or change a Marshall Proctor or voidless density value or Marshall and voidless density pairs press TARGET The gauge displays the Target menu To edit a target value press the number key that corresponds to that value For example to edit the Gmb Marshall value press 1 The gauge displays the selected Target Value menu The Target Value menu for the Proctor value is shown on page 3 2 The menu shows the four stored target values if any and the New and Disable options To select a stored target value press the number key that matches the displayed target value To store a new target value press 5 At the prompt use the number keys to enter the target value Press ENTER START The gauge displays the value entered and asks if the operator wants to store the value To store the value press YES The gauge can store the value in one of four me
7. s the density and moisture standards DS and MS The gauge also displays P or F to show if the results fall within acceptable limits The DS should be within 1 and the MS should be within 2 of the previous four standard counts Troxler recommends that the operator keep a daily log of the standard count results using Appendix D of the Model 3430 and 3440 Plus Manual of Operation and Instruction user manual SITE PREPARATION To ensure measurement accuracy properly prepare the test site before taking gauge measurements SOIL SITE CAUTION Safety glasses and a radiation dosimeter must be worn during this procedure Locate a smooth site on the soil free from any large holes cracks or debris If necessary smooth the surface by moving the scraper plate in a back and forth motion Fill any voids or depressions with fine sand ensuring that the total area filled does not exceed approximately 10 percent of the bottom area of the gauge Strike off any excess fill Place the scraper plate back on the surface and press down slightly to level the surface As shown at left put the drill rod through the extraction tool and then through one of the guides on the scraper plate Place the drill rod assembly on the test site Step on the scraper plate Hammer the drill rod at least 50 mm 2 EXTRACTION TOOL in deeper than the desired test depth The l drill rod increments SCRAPER PLATE include the additional DRILL ROD GUIDE depth
8. set and returns to the Ready screen The trench offset is active for moisture measurements at all source rod positions and for density measurements in backscatter position and direct transmission positions of less than 4 inches TESTING AND MEASUREMENT Before taking any measurement set the measurement mode by pressing MODE then press the number key that matches the desired mode Check the count time Enter a target value if desired Prepare the test site To begin a reading lower the source rod and press ENTER START In the Automatic depth mode Model 3440 Plus only the gauge determines the source rod depth automatically In the Manual mode the operator must enter the source rod depth manually After taking readings lift the gauge from the test site by the source rod handle This returns the source rod to the SAFE position When not taking readings always keep the source rod in the SAFE position After the measurement the gauge displays the measurement results To store the reading press STORE see below For soil direct transmission measurements the density depth of measurement is the depth at which the source rod is placed except for backscatter mode which is approximately 4 in The moisture depth of measurement is determined by the moisture or hydrogen content of the material being tested The following equations can be used to determine the approximate depth of measurement Depth inches 11 0
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