ZORN Mini | Light Weight Deflectometer for narrow trenches
Too narrow for a Light Weight Deflectometer? Not for the ZORN Mini!
A narrow solution with proven quality. ZORN Light Weight Deflectometers are trusted by leading construction companies and supervisory authorities alike. For many years, they have also been used in broadband expansion projects.
The reason is simple: the measurement is completed in just two minutes, no additional tools are required, and the results are reliable and safe.
The ZORN MINI allows you to cost-effectively test the compaction of backfill material even in confined and narrow trenches. This helps you prevent damage caused by later settlement - damage for which you, as the contractor, may be held liable by the client. Avoid these risks. Test quickly and safely. Even beginners can start immediately. The ZORN Mini works on the same principle as its “big brother LWD”. See how easy it is in our user videos.
Unique: Thanks to its specially developed oval load plate, the ZORN Mini reliably performs measurements directly inside fiber optic trenches.
And with the unique bayonet locking system, you can effortlessly lift out the entire device including the load plate - an advantage that makes a decisive difference in everyday construction work.
Fast. Precise. Efficient.
A small device for a large task. Cable trenches for broadband fibre optic cable are often narrower and shallower than those for conventional supply cables. Nevertheless, the quality of the compaction must be correct during the filling of the trenches. Conventional falling weight deflectometers are too large for a test and therefore unsuitable.
With the ZORN MINI a Lightweight Deflectometer specially developed for this application is now available to construction companies and their contractors. Based on the proven test specification TP BF-StB, Part B 8.3, users can reliably test the compaction from a trench width of 120 mm using this device.
New challenges demand appropriate skills. The loading plate for the ZORN MINI has an oval shape and with a minimum width of 100 mm matches the geometry of a narrow fibre optic cable trench. The area of the plate is the same as that of a conventional Light Weight Deflectometer with a round loading plate of 150 mm diameter. The maximum normal stress under the loading plate of the ZORN MINI is 0.2 MN/m2.
Also while backfilling narrow fibre optic cable trenches, courses of material are generally applied in layers and compacted. The course thicknesses of 150–200 mm are less than during conventional road openings. The ZORN MINI is equipped with a 5 kg falling weight matched to these conditions. The impact force generated with this falling weight of 3.535 kN is optimal for testing these courses.
The most important information about the ZORN Mini is summarised in the flyer.