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Proven primary standard
Pressure balances are the most accurate instruments for the calibration of electronic or mechanical pressure measuring instruments. The direct measurement of pressure, (P = F/A) and the use of high-quality materials, result in small measurement uncertainties and an excellent long-term stability of five years (Recommendation in accordance with the German Calibration Service DKD/DAkkS). For these reasons pressure balances have already been used in the calibration laboratories of industry, national institutes and research laboratories for many years.
Self-contained operation
Due to the integrated pressure generation and the purely mechanical measuring principle, the CPB5000 is ideally suited to on-site use as well as service and maintenance purposes.
Basic principle
Pressure is defined as the quotient of force and area. Correspondingly, the core of the CPB5000 is a very preciselymanufactured piston cylinder system, which is loaded with masses in order to generate the individual test points. The weight applied is proportional to the desired pressure and accomplished 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.
Easy operation
The pressure is set via an integrated pump. For fine adjustment a very precisely adjustable spindle pump with a precision spindle running only within the pump body is mounted. As soon as the measuring system reaches equilibrium, there is a balance of forces between pressure and mass applied. The excellent quality of the system ensures that this pressure remains stable over several minutes, so that the device under test can be calibrated or time-consuming adjustments can be carried out without any problems.
Solid instrument design
With the highpressure model calibrations up to a maximum pressure of 5,000 bar are possible. It has been designed around a solid platform and offers exceptional ease-of-use. With the integrated initial pressure pump and the 250 ml tank, large test volumes can also be easily filled and pre-compressed. The piston cylinder system is fixed to the basement and has special bearings ensuring excellent operating characteristics with a long free rotation time and low fall rates and a very high long-term stability also at high pressures and forces. Therefore the recommended recalibration interval is 5 years. The materials of the piston and cylinder have very small pressure and thermal expansion coefficients, which results in a very good linearity of the effective cross-sectional area of the piston and high measurement accuracy. The test connection is equipped with a knurled nut and interchangeable threaded adapters with metal sealing cones. M16 x 1.5, M20 x 1.5 and 9/16-18 UNF adapters are in scope of supply.
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