WIKA CAL - Handbuch (Seite 49)

49 WIKA instruction manual WIKA-CAL
14097663.01 04/2014 GB/D
GB
6. Object manager
Pistons can be assigned to a standard, which correspond to a model with the type of
instrument “Dead weight tester”. If the piston of the pressure balance is assigned, it
can be selected for the calibration, or is automatically pre-selected.
Weight (kg) Weight of the piston
Density (kg/m³) Density of the piston
Effective area (m²) Cross-sectional area of the piston
TC alpha + beta (1/K) The temperature coefficient consists of the sum of the alpha and beta of
the piston.
Distortion coeff. (1/bar) Deformation coefficient of the piston
Circumference (m) Calculated circumference of the piston
Lower range limit Start of measuring range
Upper range limit End value of measuring range
Unit Pressure unit of the measuring range
Resolution Resolution of the calculated value, e.g. 0.0001
Class Selection of the class/accuracy
Class abs Selection of the class for the absolute pressure range
Medium Selection of the pressure transmission medium
Vacuum piston The piston can also act as a vacuum piston via an equaliser bar. This
lowers the pressure, with the calculation of the pressure value, when
placing the masses.
Surface tension
considered in weight
The additional weight, acting as a result of the surface tension of the
medium, which acts on the piston can also be provided directly in the
piston weight. The weight via the surface tension is ignored when setting
the option, and must be included in the piston weight.
Coeff. V (Budenberg) Volume coefficient, specific for Budenberg pressure balances.