THE LIGHT WEIGHT DEFLECTOMETER
Service +49(0)391 2514666 02/2017 Instruction Manual HMP LFGpro – en
Function
The load plate is placed on the prepared area to be tested and the loading
mechanism is positioned on the load plate. Thereafter the connection is made
to the settlement measuring instrument. When the drop-weight is released and
drops freely onto the resilient element, the loading mechanism generates a
defined impulsive load. Thereby the total settlement of the soil under the load
plate is measured.
After the measuring routine is started (after the precompaction) three
measuring impacts are to be performed. After each impact, the measuring
instrument displays the settlement in millimetres and the settlement curve.
Upon completion of a series of measurement the individual settlement
amplitudes, the average settlement s
m
, the
path-speed-ratio s/v
and the
calculated deformation modulus E
vd
are displayed on the screen.
Results may be printed via a thermal printer or a printer at the PC, if required
(only instruments with thermal printer or PC-software).
Specifications
Mechanical loading mechanism
Total weight 15.0 kg
Weight of drop-weight 10.0 kg
Maximum impact force 7.07 kN
Duration of impact 17.0 ± 1.5 ms
Resilient element package comprising prestressed
disc springs
Load plate
Diameter 300 mm
Plate thickness 20.0 mm
Weight 15.0 kg
Electronic settlement measuring instrument
Power supply Rechargeable Lithium-ion polymer
battery pack
(Lithium polymer battery pack)
Dimensions 210 mm x 100 mm x 31 mm
Weight 0.45 kg
Settlement range measured 0.1 to 2.0 mm ± 0.02 mm
Range measured deformation modulus E
vd
< 225 MN/m²
Temperature range 0 bis 40 °C
Display 3.5“ TFT colour display
Interfaces Bluetooth, USB, thermal printer
GPS integrated
Memory capacity up to 1000 test series
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