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.
580L PISTON UNIT
The 580L piston unit is a simple rugged single range piston unit which covers pressures up to 120 bar (1600 Ib/in2 ). The cylinder for the piston unit is screwed into a connection which screws on to the base unit pressure connection blocks threaded boss. The piston head carries the calibration weights and is fitted to 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. A sighting hole is provided in the cylinder wall so that the base of the piston head can be seen and monitored to ensure that the piston head is floating when in use. The pressure datum level of the piston unit is marked on connection used to screw the piston unit cylinder on to the base unit pressure connection block’s threaded boss.
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