Information on other equipment configurations, on special applications of the Light Weight
Deflectometer and on the so-called Medium Weight Tester M-FG can be found at our web-
site www.zorn-instruments.com.
1. Intended Use
03
The ZFG 3.0, ZFG 3.1 and ZFG 3000 Light Weight Deflectometers (LWD) are used to determine the
dynamic deformation modulus E
vd
[MN/m²] by means of dynamic plate load tests. This provides con-
clusions on the bearing capacity and compaction quality of soils.
The main field of application for LWD equipment is earthworks and road construction. Further applica-
tions are landscaping and soil exploration.
According to test specification TP BF-StB Part B8.3 (2012), the Light Weight Deflectometer is parti-
cularly suitable for the testing of:
• Coarse and mixed-grained soils with a maximum grain size of up to 63 mm
• Fine-grained soils or comparable building materials with a stiff to firm consistency
• Soils after soil improvement measures
The Light Weight Deflectometer may be used for self-monitoring and for acceptance test in accordan-
ce with this regulation.
For the ZFG 3.0, ZFG 3.1 and ZFG 3000 Light Weight Deflectometers, the standard version with 10
kg loading device and 300 mm load plate has an upper measuring limit of E = 70 MN/m² (MPa). This
corresponds to a settlement of about 0.3 mm.
Measurements on more highly compacted soils should be carried out with the 15 kg loading device
with 1.5 times the impact load. This extends the measuring range to 105 MN/m².
The Light Weight Deflectometer can be used as a supplement or alternative to the static plate load
tester according to DIN 18134 and has the following advantages:
• No loading support (truck) or tripod necessary
• Testing is possible under confined conditions (e.g. track construction, trench backfilling, back-
filling, boreholes, other places difficult to access)
• Low space requirement and low mass of the testing device
• Low time requirement for the test (approx. 2-3 min. per measuring point)
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