DOS0008 – Oil Deadweight Tester

The oil operated deadweight tester DOS0008 has an accuracy of 0.008% of reading. The design is similar to the DOS001, but the piston cylinder assembly is even more accurate. To correct the temperature error a PT100 with LCD display is applied.

The piston cylinder is made of tungsten carbide which is extremely hard and wear-resistant. The weight column and pump are mounted on a stainless steel base plate. A triangle frame is used to make a steady and firm base for the weight column and can be leveled out by a spirit level. The weight carrier is of a hanging type and therefore insensible for any negative influences like friction of a support piston. An EA RVA certificate by an accredited third party is standard. The certificate shows the effective area as well as a list of all masses.

+44 (0)117 9654615


The primary function of the system is to combine two primary metro logical quantities:

  1. the piston-cylinder which defines an effective area, A.
  2. the masses, value m, which press on the piston with a force F.

The oil deadweight testers DOS001 and DOS0008 can be ordered with different mass sets.
Generally it is delivered in kg. With the mentioned formula.

The table gives a list of masses corresponding with the ranges.

At the moment two different diameter of pistons are available but in the near future it will be expanded to more different pistons sizes:



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