Moisture Measurements
The Troxler Model 6760 Moisture Probe can be supplied with
the Model 4540 EGauge, it uses dielectric measurement
technology to indicate the moisture content of the soil being
measured. If a moisture value is known by the gauge the
moisture content, percent moisture and Dry Density value can
be reported and the % Proctor can also be calculated. The
EGauge also allows the moisture value (%M) to be entered
using the keypad if another moisture measurement method is
specified.
The probe is approx. 5.5 inches (14 cm) long and the moisture
measurement depth is at approx. 2.5 to 4 inches (8.75- 10 cm)
deep. The probe is inserted in the same predrilled hole that the
EGauge uses for the density measurements. It is important that
the probe be inserted in the predrilled hole carefully as it
requires a tight fit in order to achieve a reliable reading.
Removal of the probe damages the hole; therefore, it may be
best to perform the density measurement first.
The EGauge is preprogrammed with 3 generic soil profiles:
General, Clay and Cr. Aggregate. General is best used when
measuring granular and non-clay type materials, Clay is used
on materials classified as clay and the Crushed Aggregate
profile is for aggregate subbase material.
It is also recommended that the user adjust the probe readings
to the particular material being measured using the Moisture
Probe Offset. This will ensure the most accurate results.
The Moisture Probe Offset is the best procedure to use, using 3
or more known samples (oven dry for example) which
represent moisture levels found in the field in order to
determine an offset.
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