ZORN ZFG Light Weight Deflectometer (LWD)

Proven for decades: Over 70,000 testing devices sold and more than 10,000 satisfied ZFG customers rely on our durable LWD. Robust, reliable and low-maintenance, they accompany construction projects for decades - a guarantee of quality and precision in construction and engineering practice.

ZFG D plus | LWD for wireless operation

ZFG 3.1 | LWD with small handheld device (printer, printer case optional)

ZFG 3000 | Light Weight Deflectometer with compact measuring electronics in a robust case including printer

ZORN Mini | LWD for narrow trenches (broadband, fibre optics, trenching)

Click here for the accessories.

... for rapid compaction testing of soils

The Light Weight Deflectometer is used to determine the compaction quality and load-bearing capacity of soils and unbound base layers in earthworks, foundation engineering and road construction, as well as for soil improvement. Within two minutes, you can perform high-quality measurements in accordance with different international standards (see below) and obtain, among other things, the dynamic deformation modulus E_vd [MN/m²] .

This dynamic plate load test can be carried out in confined spaces (e.g. bridge underpasses, pipe trenches) without load vehicles or other aids. With different electronic systems (ZFG 3000, ZFG 3.1 or ZFG D plus), our LWD scores points with its modular design and practical additions. GPS/GNSS and WiFi are of course included. The accompanying ZORN FG WebApp, which can be used free of charge, simplifies data logging. As a quality leader, it is important to us to continue to be the best in service and to work with you honestly and transparently without any hidden follow-up costs.

Get a no-obligation consultation and purchase your reliable drop weight device from the service winner.

Service leader________________________________________________________________

With our Light Weight Deflectometer, you benefit from an unbeatable service network all around the world. Our calibration centres guarantee fast and reliable maintenance carried out by trained specialists. We provide unbureaucratic and direct assistance – always fair and customer-oriented. Transparent costs with no hidden fees make our service global unbeatable.

Technical expert_________________________________________________________________

Our LWD combines precision, innovative technology and ease of use. Developed for engineers, construction companies and soil testers, it delivers accurate results in compaction tests and ground analysis. Thanks to state-of-the-art technology and practical functions, you are always one step ahead.

The reliable and consistent use of the measuring device also called a "drop plate" is regulated in Germany in particular by the Technical Testing Regulations for Soil and Rock in Road Construction (TP BF-StB) Part 8.3, in conjunction with the Zusätzlichen Technischen Vertragsbedingungen und Richtlinien für Erdarbeiten im Straßenbau (Supplementary Technical Conditions of Contract and Guidelines for Earthworks in Road Construction) (ZTV-E StB).

ZORN INSTRUMENTS also operates a calibration stand for the Lightweight Deflectometer. This stand was developed by us for the German Federal Highway Research Institute (BASt) and was the first of its type to be approved by the authorities.

You will find more detailed information on our technical service on the calibration and servicing page.

For decades, highly qualified employees from ZORN INSTRUMENTS have been actively involved in related research and standardisation forums, in Germany and worldwide. Numerous international standards such as ASTM E2835-11 or the Austria test specification RVS 08.03.04 in the meantime permit users to use the dynamic plate load test correctly in their countries and in the related conditions there.

Test specifications and contractual terms and conditions for the
dynamic plate load test.

Dynamic plate load test specifications: the Lightweight Deflecto-
meter from ZORN INSTRUMENTS meets all specifications for the
correct usage of the dynamic plate load test.

TP BF-StB Part B 8.3
Road construction, Part E1 (Statistics)

ZTVE-StB 09
Road construction, base courses, sewer construction

NGT 39 - Eisenbahnbau
Railway construction

RIL 836 Deutsche Bahn AG
Guidelines for the use of the lightweight deflectometer in railway
construction

RVS 08.03.04 March 2008
Compaction verification using dynamic plate load test (Austrian
test specification)

UNE 103 807-2
Spanish test specification

ASTM E2835-11

All certificates at a glance.

Efficient ground control

The “drop plate” enables fast and precise measurements of compaction quality. Its ease of use and quick readiness for use save valuable time on the construction site.

Flexibility in every situation

The compact design makes it particularly mobile and versatile - whether in road construction, bridge building or geotechnical engineering. Wherever fast and reliable results are required, the Light Weight Deflectometer is your first choice.

Sustainability as standard

Our equipment is designed to be durable and environmentally friendly, meeting the highest standards in the construction industry. Durability means less use of resources and less maintenance.

Your advantage: the best global service network

Our global service network ensures that you receive rapid support when needed. With our experienced dealers around the world, we are always on hand to provide maintenance, calibration and technical advice.