Falling Weight Deflectometer (FWD)
FWD(Falling Weight Deflectometer) is one of the most advanced non-destructive structure testing equipment of road surface strength in the world. It has become a hot topic in the field of road in the world to measure dynamic deflection of road surface and calculate the rebound modulus of road surface, ideal equipment for comprehensive testing. Use our FWD, to ensure road safety and ensure people's lives. We provide portable, light, HWD Heavy Falling Weight Deflectometer, Please check our product list if you need it.
| Hammer weight: | 450kg |
| Moving speed: | 0~120km/hour |
| Testing speed per point: | 25~30s |
| Deflection type: | magnetoelectric speed sensor |
| Deflection sensor q’ty: | 1~9pcs selectable (standard config is 9pcs) |
| Deflection range: | ±2500um |
| Deflection accuracy: | 2% |
| Deflection repeatability: | 1% |
| Loading force: | 12~150kN (can be extended to 250kN) |
| Loading pulse shape: | essentially half-sine |
| Loading repeatability: | 2% |
| Loading resolution: | 0.1kN, 1kpa |
| Temp. Measuring range: | -50°C~100°C |
| Temp. Resolution: | 0.1°C |
| Temp. Accuracy: | 0.50% |
| DMI sensor type: | pulse coder |
| DMI sensor q’ty: | 1pc |
| GPS locating: | horizontal within ±2meter |
- Our TBTFWD-NJ-MV falling weight deflectometer is vehicle mounted, which means the instrument is installed inside the vehicle. In this way, the road deflection equipment is more easy and convenient for future maintenance and operating, avoids of wet from raining or dust, extend the instrument usage life.
- The technical specification is the same as per model TBTFWD-NJ-M falling weight deflectometer.
- To use vehicle mounted FWD, it has some requirement on the vehicle, also require customers to have technical team to do the modification, we will supply guidance at site or remotely.
| Hammer weight | 450KG |
| Moving speed | 0~120km/hour |
| Testing speed per point | Around 20~30s |
| Deflection type | Magnet electric speed sensor |
| Deflection sensor quantity | 7pcs (can be extended up to 15pcs) |
| Deflection range | ±2500um |
| Deflection accuracy | 2% |
| Deflection repeatability | 1% |
| Loading force | 12~150KN (optional 250KN of HWD for airport available ) |
| Loading repeatability | 2% |
| Loading resolution | 0.1KN , 1Kpa |
| Loading plate | D300mm / 4-segment plate |
| Temp. measuring range | -50℃ ~ 100℃ / platinum resistance & infrared |
| Temp. resolution | 0.1℃ |
| Temp. accuracy: | 0.50% |
| GPS accuracy | /-2meters |
Heavy weight deflectometer (HWD) is a non-destructive testing instrument for pavement and airport, upgraded from original falling weight deflectometer (FWD). It can be used for pavement bearing capacity measurement and non-destructive testing of stiff bound material as found on airport runways and truck car parks.
| No. | Description | Content |
| 1 | Usage | Structure strength test for airport road pavement |
| 2 | Main unit | Trailer, deflectormeter, laptop, software |
| 3 | Specification | |
| 3.1 | trailer | Trailer type: 1. brake system 2. traction device 3. signal device 4. safety sign 5. alarm 6. speed: 0~120km/h 7. trailer length: ＞4m 8. front angle: 34° 9. axle: two axle |
| 3.2 | Main function | 1. auto deflection testing and loading 2. auto ambient, surface temp. testing 3. auto locking function 4. can record more than 60ms data 5. auto record deflection, load, temp. GPS and other data 6. can do DMI distance calibration and verification 7. hammer system up/down auto balance |
| 3.3 | Parameter | 1. working type: trailer type 2. hammer lifting: hydraulic type 3. power supply: traction device power, DC 12V 4. deflection sensor: 9pcs 5. min. distance to earth: >20cm 6. deflection range: -2500μm~ 2500μm 7. deflection measuring accuracy: better than 2% 8. deflection resolution: 0.1μm 9. capacity: 0～250kN 10. loading accuracy: better than 2% 11. loading plate: D300mm or D450mm (4-side profile) 12. temp. Range: -50℃~100 ℃ 13. temp. Measuring accuracy: 0.5% 14. temp. Measuring resolution: 0.1℃ 15. distance sensor accuracy: 0.1% 16. testing time for each point: 35s (3 hammer action) |
- The light weight deflectometer meets the needs of a wide range of applications:
- Highway, railway and earthwork construction projects
- Ditch soil quality inspection
- Construction cushion quality inspection
- Pile hole, pit quality inspection
- Deformation modulus detection of building foundation frame
| 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 10kg hammer) |
| Height: | 1100mm |
| Loading board | |
| Diameter: | 300mm (optional 200mm, 450mm) |
| Thickness: | 20mm |
| Material: | galvanized alloy steel |
| Weight: | 15kg |
| Electronic Settlement (wireless control) | |
| Loading force measurement range: | 25kN |
| Loading force measurement accuracy: | <2% |
| Displacement measurement range: | 2mm |
| Displacement measurement accuracy: | <1% |
| Measurement time per point: | <1min |
| 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°C~40°C |
| Working environment humidity range: | not more than 85% RH (no condensation) |
TBTLWD series light weight deflectometer, is a non-destructive (NDT) instruments, also called as dynamic deformation modulus tester (hand-held drop hammer deflection meter), it is used to determine the deflection capacity of the subgrade under the dynamic load, thereby evaluating the bearing capacity and deformation of the subgrade.
The deflectometer can be used to monitor and inspect the quality of foundation construction on railways, highways, airports, urban traffic, ports, terminals, and industrial and civil structures that are subjected to dynamic loads.
Our light weight deflectometer is especially suitable for the detection of narrow sections of the site, such as the transition of roads and bridges (culverts) and the detection of road shoulders and so on. It can quickly measure the dynamic deformation modulus (Evd value).
| Usage range | Soil type | Various types of soil and earth and rock mixed fillers with a particle size not larger than 1/4 of the diameter of the load plate | |
| Range | 10Mpa≤Evd≤225Mpa | ||
| Depth | 0～500mm | ||
| Working environment | Temp.: -10℃～40℃ Humidity ＜90%HR | ||
| Data acquisition device | Adding load method | With 1pc geophone sensor Weight: 15kg, including hammer of 10kg drop weight drop value: 700±20mm Maximum impact: 7.07kN Impact duration: 18±1ms | |
| Loading plate | Weight: 15kg Diameter:300mm Thickness：20mm | ||
| Handheld main unit | Deflection range | 0.10mm~2.00mm | |
| Capacity | 2000 groups of data (TBTLWD-1G) Refer to cell phone config, normally with 10G storage(TBTLWD-1GW) | ||
| Size | Screen size: 3inches(TBTLWD-1G) / 5 inch(TBTLWD-1GW) | ||
| Power supply | Li-battery of more than 18hours(TBTLWD-1G) According to cell phone battery(TBTLWD-1GW) | ||
| Display | Screen display(Chinese/English switch)--TBTLWD-1G Cell phone app--TBTLWD-1GW | ||
| Data transfer | Cable transfer (TBTLWD-1G) Wifi transfer data(TBTLWD-1GW) | ||
| Printer | Connection | Bluetooth | |
| Package | Carrying case | Inside case material: engineering plastic Measurement: around 420 × 140 × 335mm Weight: around 4.5KG | |
| Outside case material: aluminum alloy case Measurement: around 1230 × 400 × 400mm Weight: around 56KG | |||
TBTLWD-1G (wire type) TBTLWD-1GW (wireless type) 
