The MOD-2A system is used to measure the pore water pressure at the rock/concrete interface in tunnels, underground openings and basements.
The MOD-2A is suitable for short term monitoring of pressure during construction or rehabilitation of underground structures.
The MOD-2A system consists of a small mechanical (filter-end) packer, to be inserted in a 25 mm borehole, combined with an external vibrating wire pressure transducer (or manometer).
The main advantage with this type of instrumented packer is its ease of installation with simple hand tools; a standard concrete drill (borehole) and an adjustable open-end wrench for fixation. After monitoring is complete, the external pressure transducer can be removed at anytime and the MOD-2A system may be completely removed and reinstalled to other locations.
|Borehole size||> 760 mm deep X 25 mm diameter|
|Packer||Filter-end mechanical packer|
|Piezometer||PWC (or optional manometer)|
|Piezometer Range||0.2, 0.5, 1 MPa (other range available)|