5
6
Edition 1.1, May 2021 PN 128992
STEP 5 – TAKE MEASUREMENTS
Always begin with handle in SAFE position
. Ensure
that the handle is in the SAFE position by firmly
tapping down on the handle without engaging the
trigger.
We recommend 2 minutes for measurement time and
1 minute for background time. (Setup menu)
The gauge can be set to receive moisture values from
an outside device or by keypad entry. You can also
choose to perform the moisture measurement before
or after the density measurement. Press
Setup
,
choose
4.
Moisture Input
, then choose your method / order
desired.
Prepare the test site
as described in step 4. If using
the moisture probe, drive the drill rod to at least 15 cm
(6 in).
PERFORMING DENSITY MEASUREMENTS
1
1
.
.
Place the gauge on the test site with the
handle in the Safe position and press
〈
ENTER/START
〉
. Follow the prompts on
the screen to either lower the handle to the
desired measure depth or wait for the 15-
second initialization phase to complete (this
will occur approx. every 10 min. or as
programmed). Then lower handle to the
desired measurement depth, carefully
seating the handle in the proper notch and
press
〈
ENTER/START
〉
.
2
2
.
.
After count time, (when prompted) select
the active background count by answering
Yes
to the displayed question or take a new
one by answering
No
to the question. If
taking a new background count, move the
source rod to background position and
press
〈
ENTER/START
〉
. For accurate density
measurement of soils and aggregates, a
new background count should be taken at
the first test site of the day and on a new
material or a new jobsite during the day.
3
3
.
.
After the measurement, raise the handle.
The gauge displays the measurement
results or prompts for the moisture reading.
If a moisture reading is to be done, see the
next section. To store the reading, press
〈
STORE
〉
.
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.
PERFORMING MOISTURE MEASUREMENTS IN
SOIL MODE
1
1
.
.
When prompted by the 4540 gauge, insert
moisture probe into the hole until the base
plate contacts soil surface. The probe should
fit tightly in the hole, some resistance should
be felt when lowering it.
2
2
.
.
Power the probe on (green light illuminates).
The blue light will remain solid when Bluetooth
connectivity is established.
3
3
.
.
Press
Enter
on gauge keypad to perform
moisture reading, wait a few seconds then
press
Enter
on the keypad again to accept
the moisture reading. See the Guide for the
Model 6760 Moisture Probe for more
details on operation.
4
4
.
.
Carefully remove the probe and set aside.
USING THE OFFSET FUNCTION
The gauge readings 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 moisture
density
and
trench
offsets.
Press
〈
OFFSET
〉
to access the
Offset
menu.
MORE INFORMATION
The user manual provides more information about the
gauge’s functions and use.
i. Model 6760 Quick Reference Guide
ii. 6760 Technical Notes
Model 4540 Quick Reference Guide PN 128992, Edition, 1.1. May 2021
Model 4540
Soil & Asphalt Density Gauge
E
Gauge
™
Combo
QUICK
REFERENCE
GUIDE
Troxler Electronic Laboratories, Inc.
3008 E. 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