GEOTECH PVT DIRECT PUSH PIEZOMETER Manual
2015-11-11
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Fig. 8 – Thread the cable through rods/pipes – do not forget the joints. Only use high-quality pipes
free from sharp edges and burr.
Make sure that there are no sharp edges that could damage the cable.
Do not use galvanized rods/pipes. A chemical reaction may occur with the stainless steel of the
piezometer body, resulting in generation of gas and unreliable measurements.
Using a release adapter
3.3
For installation in soft soils, at limited depths a release adapter could be used together with your normal
sounding rods. When a release adapter is used, the sounding rods can be pulled back up after installa-
tion, leaving only the piezometer and cable in the ground. This makes it possible to save material by us-
ing the same rods for several piezometers.
The release adapter is to be screwed on the pushing rod and slipped into the one-inch pipe end of the
piezometer. The cable comes out of the slit and should run freely on the outside of the pushing rods dur-
ing installation. Make sure that there are no sharp edges or dirt in the cable slit of the adapter. Also make
sure that the cable is not squeezed between the adapter and the piezometer pipe.
We recommend you to pull the cable inside the rod string if you should be using rods that are thicker than
32 mm, e.g. standard 36 mm CPT rods.
Fig. 9 – Release adapters are available for most common rod types.
Make sure that there are no sharp edges or dirt in the cable slit of the adapter. Also make sure
that the cable is not squeezed between the adapter and the piezometer pipe. Pull the cable inside
the rod string if rod diameter should be larger than 32 mm in order to avoid damages to the cable.
