TROXLER 4640-B User Manual

OVERLAY THICKNESS SELECTION

Measurement layer thicknesses from 1 to 4 inches (2.5 to 10.2 cm) may be selected. Press THICK. The gauge displays:
Layer Thickness: x.xx in. Input and Press ENTER
Enter the desired layer thickness and press 〈START/ENTER.
Up to twelve readings may be averaged by the gauge. Press SHIFT and AVERAGE to display:
No. of readings to average: xx Do you want to change?
To change the number of readings to average, press YES. Enter the desired number and press START/ENTER.

STORAGE FUNCTION

Test measurement can be stored in the gauge memory under the active project number. To enter or select a project number, press SHIFT and PROJECT. The gauge displays:
Current Project: xxxxxxx Do you want a new Project #?
To accept the displayed project number, press NO. To enter a different project number, press YES and input a new project number (up to 12 digits).
To store a measurement, press STORE. Enter a station number when prompted. Enter the distance from the centerline when prompted, and enter whether the location is left or right of the centerline.
If desired, additional information may be entered under the station number (up to 12 characters). To store additional information, press YES.
5 6 1

OFFSET FUNCTION

To take measurements that are outside the calibration range of the gauge, an Offset must be entered. The gauge applies the offset to all measurements until the offset is disabled.
For site calibration, refer to Chapter 5 of the Manual for Operation and Instruction.
Press SHIFT and OFFSET. To enable or change the density offset, press 1. When the current offset value is displayed, press YES to change the value.
Press 1 to enter an offset value using the gauge keypad or 2 to select a value previously stored in the gauge memory. Follow the gauge prompts to enter or select the offset value.

TESTING AND MEASUREMENT

NOTE
The following brief description applies only to single readings. To take multiple readings and averages, refer to the Model 4640-B Manual of Operation and
Instruction.
Place the gauge over the test site. Release the gauge handle and push it down until the handle is resting on the stop pin.
Press START/ENTER. The gauge displays:
MA: xxxxx PCF Thick: xxx in. Avg: xx Time: xx secs.
After the count time has elapsed, the gauge displays:
Dens: x.x PCF %MA: x.xx% 100-%MA: xx.xx% %VOID: x.xx
To store this reading, press STORE (see Storage Function).
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.
Model 4640-B
Thin-Layer
Density Gauge
QUICK
REFERENCE
Troxler Electronic Laboratories, Inc.
P.O. Box 12057 3008 Cornwallis Road
Research Triangle Park, NC 27709
Phone: (919) 549-8661 Fax: (919) 549-0761
www.troxlerlabs.com
PN 105176 September 2002 Edition 3.0
CARD

GAUGE START UP

STATUS
YES
EXIT
STORE
MS
MA/
VOIDLESS
SHIFT
The operator should wear a dosimeter or radiation badge when working with the 4640-B Thin-Layer Density Gauge.
Press ON. The gauge performs an LCD test and a 300-second self-test. Following the self-test, the gauge enters the Ready mode. The display is:
NO/CE
C/CE
THICK
MR
TIME
STD
Model 4640-B Keypad
789
PROJECT
4
SP. CAL.
12
RECALL
0
NOTE
<READY> mm/dd/yy Avg: xx Time: xx mins. BATT LIFE xx Hrs
The first line of the display alternates between the current time and date. The second line indicates any gauge options that are enabled, such as Average Mode. The third line indicates the enabled count time. The last line indicates the remaining battery life.
AVERAGE SPECIAL
PRINT ERASE
OFFSET
5
6
CALC.
3
START/
.
ENTER

THE STANDARD COUNT

To compensate for the source decay and naturally occuring background radiation, and to check proper operation of the gauge, take a standard count daily. Use the magnesium (Mg) reference block and air gap spacer for this operation.
Place the reference block on a dry, flat surface of asphalt or compacted soil with a density of at least 100 pcf (1600 kg/m3). 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.
Place the air gap spacer on the reference block and then place the gauge on the spacer. Ensure that the source rod is in the SAFE position. The handle end of the gauge should rest over the two posts on the spacer.
Press STD. The gauge displays the last standard count. To take a new standard count, press YES. Check the gauge position, then press START/ENTER to begin the standard count.
After taking the standard count, the gauge displays the results and beeps. Record the count in the standard count log and press YES to accept the count. The gauge returns to the Ready mode.

SITE PREPARATION

The 4640-B gauge is designed for use on asphalt surfaces and does not require a great deal of surface preparation.
NOTE
Keep the gauge turned parallel to the direction of the paver and rollers.
Find a smooth, level location on the asphalt. Remove any loose material (sand, aggregate, and so on) from the site. Ensure that the gauge does not “rock.” It must remain level and steady. 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 away from the hole to level the gauge.

GAUGE SETUP

COUNT TIME

To view the current count time (length of measurement), press TIME.
- Count Time ­ xx min. Do you want to change ?
To change the count time, press YES. Use the numeric keys to select the desired count time. The gauge returns to the Ready mode.

DATE AND TIME

To access the current date and time settings, press SHIFT and SPECIAL. Press 1〉, 〈0, and START/ENTER. Enter the access code and press START/ENTER .The gauge displays:
Date: mm/dd/yy Do you want to change Date?
To change the date and/or time, press YES. Note that both the date and time must include leading zeroes. For example September 9, 2002 must be entered as “090902” and 9:05 must be entered as “0905.” Enter the new date and, when prompted, the new time.

MARSHALL/VOIDLESS DENSITY

To select a Marshall or voidless density value, press MA/VOIDLESS. The gauge displays:
MA: xxxxx PCF VD: xxxxx PCF Do you want to change?
To change a value, press YES. The values should be a result of laboratory samples or a predetermined specification. To correct any input errors or abort the change, press CE.
2 3 4
Loading...