Falling Weight Deflectometer
Product Code : EL-BTLE-10454
Falling Weight Deflectometer (code EL-BTLE-10454) is a pavement testing system that applies an impulse load to the surface and records its vertical deflection response with load and deflection sensors, from which bearing capacity, layer thickness, E moduli and expected surface life are calculated. A test point of 3 drops takes ≤ 20 seconds, or ≤ 10 s with fast measurement software, the deflection range is ± 3.5 mm (± 5 mm optional), and GPS locates each test position.
Get a quote: use the Add To Cart enquiry button below, or send your quantity and delivery location through the contact page.
Specifications
| Parameter | Detail |
|---|---|
| Use | Measuring the vertical deflection response of a pavement surface to an impulse load |
| Sensors | Load measurement and deflection sensors recording the pavement surface characteristic |
| Calculated properties | Bearing capacity, layer thickness, E moduli, expected surface life |
| Other uses | Determining the material used and in what combination the pavement was built; identifying voids underneath the surface and how two surfaces, typically concrete slabs, are in contact |
| Testing speed | ≤ 20 seconds per point (3 drops); ≤ 10 s per point with fast measurement software |
| Load control | Multi load control: allowable load, allowable deflection height, target deflection length (for void testing) |
| Positioning | Operating software with GPS function to locate the testing position |
| Driver guidance | Software reminder function guiding the driver to park the vehicle at the testing location |
| Deflection range | ± 3.5 mm (± 5 mm optional) |
| Temperature monitoring | Infrared + PT100 monitor for air and pavement temperature |
| Operation | Fully automatic one-key operation at the testing location; locks automatically after testing |
| Deflection calibration | Laser absolute calibration |
| Lift platforms | Bisync lift platforms |
| Redundancy | Backup plan for each main function |
| Result check | Automatic self-check of results |
| Data transfer | To PC by USB memory key or direct connection |
| Product code | EL-BTLE-10454 |
| Manufacturer | Engineering Lab Equipment, Ambala, Haryana, India |
What Is the Falling Weight Deflectometer Used For?
Deflection testing tells highway engineers how stiff each layer of a pavement is without digging it up, and the results are used to judge remaining life and to design strengthening. At each test point the operator parks the vehicle where the software directs and starts the one-key sequence; the system drops the weight three times, records the deflection response along with air and pavement temperature, and then locks for travel. Back-calculation from the load and deflections gives the layer moduli and bearing capacity, while the multi load control settings allow targeted testing for voids under concrete slabs.
What to Specify When Ordering
- Quantity — the number of deflectometer systems required.
- Deflection range — the standard ± 3.5 mm range or the optional ± 5 mm range.
- Software — whether the fast measurement software, giving ≤ 10 s per test point, is wanted.
Frequently Asked Questions
What does a Falling Weight Deflectometer measure?
It records how far the pavement surface deflects vertically under an impulse load, and those readings are used to calculate bearing capacity, layer thickness, E moduli and expected surface life.
How long does each test point take?
A test point of 3 drops takes ≤ 20 seconds, and this can be reduced to ≤ 10 s per point when the fast measurement software is applied.
Can it find voids under concrete slabs?
Yes. It identifies voids underneath the surface and shows how adjoining concrete slabs are in contact with each other, using the target deflection length setting meant for void testing.
How are test positions located?
The operating software has a GPS function to locate each testing position, and a reminder function guides the driver to park the vehicle at the right location.
Is pavement temperature recorded?
An infrared sensor together with a PT100 sensor monitors both the air and the pavement temperature during testing, since deflection of asphalt layers varies with temperature.
How is data taken off the system?
Results pass an automatic self-check and are then transferred to a PC either on a USB memory key or through a direct connection.
OEM Manufacturer
Buyers of the Falling Weight Deflectometer deal directly with its maker, Engineering Lab Equipment (Engineering Labs Equipment Pvt Ltd), whose works are at Plot No. 43, Industrial Park, Sector 2, Growth Center, Saha, District Ambala, Haryana, India. The company designs, makes and tests bitumen and asphalt testing equipment for binder tests, mix preparation and specimen testing, supplies engineering colleges, polytechnics, technical training institutes and research laboratories in India and overseas, and builds to institution-specific requirements on request. Tender details are on the Tenders/OEM page.
Related Bitumen and Asphalt Testing Equipment
- Benkelman Beam — telescopic aluminium lever-arm beam for measuring flexible pavement deflection under wheel loads, with carrying case.
- Travelling Beam Device — 3 m wheeled beam with recorder for graphing road surface deviations up to ± 25 mm.
- Straight Edge — 3 meter mild steel or aluminium beam with end supports for checking lateral road regularity.
- Core Drilling Machine (Petrol) — wheel-mounted petrol core drill for cores up to 200 mm diameter from asphalt and concrete.
See the full Bitumen/Asphalt Testing Lab Equipment range or all Civil Engineering Lab Equipment.
Request a Quote
For this and other bitumen and asphalt testing lab equipment, schools and colleges can contact Engineering Lab Equipment, a manufacturer, supplier and exporter based in Ambala, India. Quotations are given on request: send the number of systems, the deflection range and whether the fast measurement software is required and your delivery location through the contact page, or add the Falling Weight Deflectometer to the enquiry cart from this page.
Last updated: October 2026
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