Product Description; General Product Information - WIKA CPB 3000 Betriebsanleitung

Pressure Balance
CPB 3000

2. Product Description

2.1 General Product Information

Application
Pressure balances are the most accurate instruments for the calibration of electronic or mechanical
pressure measuring instruments. The direct measurement of pressure, according to its definition as a
quotient of force and area, and the use of high-quality materials result in small uncertainties of
measurement and an excellent long-term stability of five years.
For these reasons pressure balances have already been used in calibration laboratories of industry,
national institutes and research labs for many years. Due to the integrated pressure generation and
the purely mechanical measuring principle the CPB 3000 is also ideally suited for on-site use as well
as service and maintenance purposes.
Piston/cylinder measuring system
Pressure is defined as a quotient of force and area. Correspondingly, the core of the CPB 3000 is a
very precisely manufactured piston/cylinder system. Both the piston and cylinder are manufactured
from Tungsten Carbide and are very well protected in a solid stainless steel housing against touching,
impacts or contamination from outside.
The entire construction design of the piston/cylinder unit and the very precise manufacturing of the
piston and the cylinder stand for excellent operating characteristics with a long free rotation time and
low fall rates and for a very high long term stability. Therefore the recommended re-calibration interval
is 5 years.
The hydraulic systems are available for measuring ranges from 60 bar up to 1,000 bar resp. 1,000 psi
up to 14,500 psi. The accuracy is 0.025 % of reading.
Functioning
In order to generate the individual test points, the piston cylinder system is weighted with mass-loads.
The weight applied is proportional to the desired pressure and provided by using optimally graduated
weights. These weights are manufactured to standard gravity (9.80665 m/s²) although for fixed
location usage they can be adjusted to a customer specified local gravity.
The pressure is set via an integrated fine-adjustable precision spindle pump. As soon as the
measuring system reaches equilibrium, there is a balance of forces between pressure and mass
applied.
Due to the high-grade quality of the system this pressure remains stable over several minutes, so that
for instance adjustments of your device under test can be carried out without any problems.
WIKA Operating Instructions Pressure Balance Version 1.1
GB
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