Troxler OFFSET FUNCTION

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Troxler OFFSET FUNCTION | Manualzz

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 offset 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 offset, 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 – (0.17

×

M), where: M = moisture in pcf

Depth (mm) = 280 - (0.27 or

×

M), where: M = moisture in kg/m

3

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 & 3440 Plus

Surface

Moisture-Density

Gauge

QUICK

REFERENCE

CARD

Troxler Electronic Laboratories, Inc.

3008 Cornwallis Rd.

• 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,

Gmb: ##.# pcf

1: ##.# 2: ##.#

3: ##.# 4: ##.#

5: New 6: Disable

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.

After taking a 240-sec standard count, the gauge displays 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). 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- g

04-08-2006 12:21 PM

Prj: TROXLER

Press <START>

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 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.

SITE PREPARATION

To ensure measurement accuracy, properly prepare the test site before taking gauge measurements.

SOIL SITE

CAUTION

NOTE

The symbol g 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. This option is available only on the Model

3440 Plus.

GAUGE SETUP

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

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.

COUNT TIME

vertical structure and 10 m (33 ft) from any other nuclear gauge or radioactive source.

As shown at left, put the drill rod through the extraction tool and the n through one of the

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

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.

DRILL ROD desired count time.

SET UNITS

Place the source rod on your left and the right side of the gauge against the metal butt plate on the block. guides on the scraper plate. Place the drill rod assembly on the test

The gauge can display measurement results in either U.S. units

(pcf) or metric (SI) units (kg/m

3

or g/cm

3

). 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.

NOTE

Ensure that the source rod is in the standard

(SAFE) position by

firmly tapping down on the handle of the source rod.

EXTRACTION TOOL

SCRAPER PLATE/

DRILL ROD GUIDE site. Step on the scrape r plate. Hammer the dri ll rod at least 50 mm (2 in.) deeper than the desired test depth. The drill rod increments include the additional depth.

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

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

ENTER/START⟩ to begin the standard count.

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.

Place the gauge on the smooth ed 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

Target Value menu for the Proctor value is shown on page 3. gauge toward the keypad so the source rod touches the side o f the hole.

2 3 4

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