TBTLWD-1 Light Weight Deflectometer (LWD)

TBT Light Weight Deflectometer LWD is a portable version of FWD, with loading cell & geophones, it can be used to test asphalt pavement & railway subbase, the data get from LWD can be used to calculate the strength of multiple pavement layers.

Technical Parameters


Loading device
Hammer：10.0kg (optional 15kg, 20kg)
Maximum drop height： 700mm
Maximum impact loading：20kN
Pulse loading shape: Half sine
Wave pulse loading duration：15~30ms
Material: galvanized alloy steel
Weight：15kg (including 10 kg hammer)
Height：1100mm



Loading board
Diameter：300mm (optional 200, 450mm)
Thickness：20mm
Material：galvanized alloy steel
Weight：15kg



Electronic Settlement (wireless control)
Loading force measurement range：25 kN
Loading force measurement accuracy：
Displacement measurement range：2mm
Displacement measurement accuracy：
Measurement time per point：
Sensors for displacement measuring：3pcs (expandable)
Data storage capacity：2000 group test data
Power supply：Lithium battery
Continuous working time：12 hours
Working environment temperature range：-10 ~ 40°C
Working environment humidity range：not more than 85% RH (no condensation)