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M PA S eries

Masses

In the central part of each mass a cavity, has been realized,closed by a lid, in where different stainless steel spheres, with different diameters, can be inserted to adjust the mass value. In the BLUE LINE the masses are adjusted with spheres of 1 mm in diameter corresponding to about 10 Pa for the 120 MPa unit. There is the possibility to adapt the masses at nominal value and g
L values.

MPA Mass Set

MPA120 MPA60 MPA36 MPA12 (1,2 ÷120) MPa(12 ÷1200) bar (0,6 ÷60) MPa(6 ÷600) bar (0,36 ÷36) MPa(3,6 ÷360) bar (0,12 ÷12) MPa(1,2 ÷120) bar Qty Value / MPa (bar) Qty Value / MPa (bar) Qty Value / MPa (bar) Qty Value / MPa (bar) 10 10 (100) 10 5 (50) 10 3 (30) 10 1 (10) 2 5 (50) 2 2,5 (25) 2 1,5 (15) 2 0,5 (5) 1 3 (30) 1 1,5 (15) 1 0,9 (9) 1 0,3 (3) 1 2,5 (25) 1 1,25 (12,5) 1 0,75 (7,5) 1 0,25 (2,5) 1 1 (10) 1 0,5 (5) 1 0,3 (3) 1 0,1 (1) 2 0,5 (5) 2 0,25 (2,5) 2 0,15 (1,5) 2 0,05 (0,5) 1 0,25 (2,5) 1 0,125 (1,25) 1 0,075 (0,75) 1 0,025 (0,25)

Motor Drive system

The motor drive system is designed in such a way that the application of the rotation to the piston is given only when the piston is in its lowest position. When pressure is increased the piston moves-up to reach its floating position, where the piston is in its free rotation; a proximity sensor detects the piston floating position and automatically switches off the motor. The motor system and the piston-cylinder unit are totally independent and not in mechanical contact between each other during measurements. The rotation is transferred to the piston by friction of three rubber wheels with the masses carrier.

Rotation Speed

In free rotation, the behavior of the reduction of the rotation speed is also extremely regular as a function of time. For example for a 120 MPa unit tested, after 30 minutes the reduction of rotation speed starting from 33,3 rpm was only 25,0 rpm. This qualitatively represents a proof of the regularity of pressure distribution in the gap of the piston-cylinder.

Integrated sensors

A barometer for atmospheric pressure measurement, an ambient temperature probe, a relative humidity sensor, a thermo-resistance for the measurement of the piston-cylinder temperature and a proximity sensor that collects information about the floating level of the piston are installed.