The most accurate method for determining density of solid bodies in accordance with OIML R111-1 is hydrostatic technique comparing the mass in a liquid.
Sartorius has integrated this method in its fully automatic volume comparator: With the VD1005, Sartorius supplies a system for density determination for weights in the range from 1 g up to 1 kg.
The volume comparator is equipped with two nine-position load alternators: One in a liquid bath and one in the air.
The two load alternators operate synchronously in that one position in liquid is assigned to each second position in air.
By using substitution weights, this innovative dual-weight alternator design makes it possible to directly compare the mass of a single-volume reference (e.g., silicon sphere) with a variety of weights in liquid.
The load alternators and weighing pans are designed as comb-type weight grabbers so that weights and groups of weights from 1 g to 1 kg can be transferred directly from the load alternator to the suspended weighing pan. Adapter plates are not required. This has a positive effect on the accuracy of the overall measurement system.
After the data has been entered, an integrated PC with user-friendly software takes over fully automatic control of the volume comparator and evaluation of density measurement.