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Oil deadweight tester Type ODWT15

 

Product description

DescriptionOil deadweight tester Type ODWT15

Basic principle
A deadweight tester is based on a high accurate manufactured piston and cylinder assembly. This cylinder is mounted in a column. The piston can rotate and move freely up and down. Accurate calibrated masses are loaded on top of the vertical mounted piston. A pressure is applied on the bottom of the piston to lift the piston with masses. This creates a balance between the force made my the masses (downwards) and the force made by the pressure (upwards) and the effective area of the piston cylinder assembly.

Piston cylinder assembly
The piston cylinder assembly is the hart of the deadweight tester and responsible for its high accuracy. The piston cylinders are manufactured with accuracies from 0.015% up to 0.008% of reading. To give an idea of the manufacturing skills the space between the piston and the cylinder is in the μm range and can only be measured in a climatic room.

To guarantee excellent metrological characteristics all pistons and cylinders are made of tungsten carbide. Because of the extreme hardness of this material the pressure distortion (expansion) coefficient is negligible. The low friction coefficient provides minutes of turning just with a little swing.

Mass set
The masses of the SIKA deadweight tester are made of non magnetic stainless steel. They are marked with a serial number and mass or the equivalent pressure. The weights are tared out to add stainless steel to an internal chamber. This is easy for recalibration or adjustments for gravity compensation.The mass of all weights are listed in the certificate. The weights are protected by a stainless steel carrying case.

Technical features

Technical features

 
Pressure ranges 0.25…1400 bar depending on piston and mass set
Accuracy 0.015 % of reading
Pressure units

bar (standard)
psi, kPa, MPa und kg/cm² (option)
Housing material stainless steel for all wedded parts
Piston cylinder assembly tungsten carbide
Mass sets non magnetic stainless steel plates
O-ring seals NBR
Pressure connection ⅜" BSP LH male with adapters ⅛", ¼", ⅜", ½" BSP female
Pressure media DWT oil Miglyol 812N Sasol (bottle 0.5 liters)
Temperature range 18…22 °C
Dimensions

app. 340 x 225 x 220 mm (without weights)
height max. 450 mm (incl. weights)
Weight

app. 12.6 kg (without weights)
different mass sets up to 56 kg

Further details and accessories can be found in the data sheet.

Contact

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