Electrical Density Gauge

The Electrical Density Gauge (EDG) is a non-nuclear alternative for determining the Density and Moisture of compacted soils. The EDG uses the reliable “direct transmission” technique to measure the dielectric properties and moisture levels of compacted soil using high, radio frequency traveling between darts driven into the soil being tested.

The Electrical Density Gauge (EDG) is a nuclear-free alternative for determining the moisture and density of compacted soils used in road beds and foundations. The EDG is a portable, battery-powered instrument capable of being used anywhere without the concerns and regulations associated with nuclear safety. Its user-friendly, step-by-step menu guides the user through each step of the testing procedure and cautions the user when values do not correspond to established curves for the material being tested.

Easy-to-use, the EDG can be used as a construction aid to monitor day-to-day compaction operations by providing performance and measurement results highly comparable to those achieved with traditional methods, including the nuclear gauge and/or a sand-cone and oven moisture test combination. When conducting a test, the EDG measures and displays the results for wet and dry density, gravimetric moisture content and percent compaction.

For contractors the advantages of using the EDG are:

it does not require a highly-trained or licensed technician

it does not require special handling for shipping or regulatory compliance for hazardous materials

it is easy to learn and easy to use with its step-by-step menu

lightweight and easily transportable

it is accurate and repeatable with results that mirror known testing methods

Information / Specs

The EDG measures the electrical dielectric properties and moisture levels of compacted soil using high, radio frequency traveling between darts driven into the soil being tested. The dart's depth of penetration positively determines the depth of measurement. Darts are available in 4", 6", 8", 10" and 12" lengths. In addition, the darts have been designed with a taper, which ensures a continual positive contact with the soil for accurate measurements.

During the testing procedure, four tapered electrodes (darts) are driven into the ground in a cross pattern using the supplied template. Between the two sets of two tapered darts, four point-to-point electrical measurements are made and the electrical characteristics averaged. The dielectric properties that are measured by the unit are compared to a "soil model", which has been developed and programed into the unit prior to testing. These soil models are required only once for each soil type. The soil model is used as a calibration reference during the testing procedure. It is developed by establishing a curve of measured dielectric properties for different densities and moisture combinations of the actual soil to be tested or a similar material. This soil model is used by the unit through a proprietary correction algorithm to automatically determine the wet and dry density, gravimetric moisture content and percent compaction values for the material being tested. Soil models can be named using the unified soil classifications listed in the drop-down menu or unique names can be entered using the alpha-numeric keypad. In addition, the temperature probe, which is inserted into the material being tested ensures accurate results by compensating for changes in recorded temperatures. Similar to nuclear gauges, proctor numbers for optimum compaction may be input into the gauge, which would allow for percent compaction to be automatically calculated and displayed at the end of each test. The Proctor numbers would be input into the gauge during the development of the soil model. When determined, this value is entered into the EDG to enable the computation of percent compaction.


Humboldt Mfg. Co., USA

Humboldt Mfg. Co., USA

Humboldt Mfg. Co., are the leading manufacturers and suppliers of Field and Laboratory Testing Equipments. They offer a wide range of products for field and laboratory testing of Soil, Asphalt, Aggregates and Concrete. Apart from highly advanced testing systems, Humboldt also offers wide range of General Laboratory Equipments.


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