The 580 series dead-weight tester can be supplied in several different configurations. The series is based around the 580 series base unit which is common to all the different configurations. The base unit provides a pressure source, liquid reservoir, control valves and gauge or piston connections. When the base unit is used with one of the 580L, 580M, 580DX, 580HX or 580VHX piston units the configuration provides an high accuracy dead-weight tester.
580M PISTON UNIT
The 580M piston unit is a single range piston unit which covers pressures up to 300 bar (4000 Ib/in2 ). The cylinder for the piston unit is mounted on a connection which screws on to the base unit pressure connection block threaded boss. The cylinder is fastened to the connection by a special nut into which is fitted an indicator to show when the piston head is floating and also indicate the datum level for the tester. The piston head carries the calibration weights and is carried on a ball at the end of the piston. A stop on the opposite end of the piston abuts the internal end of the cylinder when the maximum piston extension is reached. The piston head is fitted over the outside of the cylinder to prevent accidental damage to the piston and cylinder
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