The cell is mounted onto one end of a double acting hydraulic ram via a swivel joint and at the other end is a reaction plate the same diameter as the cell.
The ram and cell assembly is installed into the reinforcement cage with the cell and reaction plate positioned either side of the cage with the ram passing through the reinforcement. It is loosely supported in the cage by tie wires or a prefabricated cradle.
After the reinforcement cage is lowered into the trench the hydraulic jack is hydraulically pressurised forcing the earth pressure cell and reaction plate against the sides of the trench. The hydraulic pressure is increased to ensure good embedment into the trench wall. The ram pressure is maintained throughout the pouring and curing of the concrete.
A vibrating wire piezometer can also be incorporated to measure pore water pressure.