About
Offsets
The Troxler Model 4540 is factory-calibrated for typical soil
materials. Gauge readings can be adjusted based on
alternative density tests, such as sand cone or drive cylinder
tests. This adjustment, or shift, is known as an offset.
NOTE
When an offset has been enabled, all future readings
will automatically be adjusted until the offset is
disabled or the gauge is turned off. Be sure to disable
offsets and prior to taking readings on materials that
do not require an offset. Offsets will be disabled if
the gauge is turned off for more than 10 seconds.
The gauge provides density, trench and moisture probe offset
options.
The density offset is often needed if the material has a density
that is outside the range of 70 to 170 pcf (1100 to 2700 kg/m
3
).
Also, if material has a high concentration of elements with
atomic numbers greater than 20 (such as concrete, some coals,
or ferrous soils).
A trench offset should be used if measurements are to be taken
inside a trench or close to a solid structure such as a wall,
barrier, or construction equipment. The Trench offset is not
needed if all density measurements are to be performed at 6”
(150 mm) or deeper in the trench situation.
A moisture probe offset should be used then the moisture
content of a laboratory sample differs from the reading
provided by the Troxler Moisture Probe Model 6760 (included).
The Moisture Offset Function is a simple procedure to adjust
the moisture readings up or down. To perform a true moisture
calibration for a particular soil, the Moisture Probe Calibration
is recommended as described in the Setup Menu section of this
manual (see page 5–2).
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