Applications
High level digital primary standard
Reference instrument for factory and calibration laboratories for the testing, adjustment and calibration of pressure measuring instruments
Unique wor
Reference instrument for the testing and calibration of differential pressure measuring instruments and sensors under static pressure
For positive or negative differential pressure measurements
Cross-floating for piston-cylinder effective area determination
Special Features
Total measurement uncertainty to 0.002 % of differential pressure, static pressure effect to 1 ppm
Calibration certificate as a standard from our COFRAC accredited laboratory, LNE/PTB calibration certificate as an option
Static line pressure up to 800 bar pneumatic
Differential pressure from 10 Pa up to 800 bar
Primary standard differential pressure balance model CPB6000DP
Description
Reference primary standards
Pressure balances are high accuracy fundamental pressure standards that define the derived unit of pressure directly from the fundamental units of mass, length and time following the formula p= F/A.
The direct measurement of the pressure with a balance combined to the know-how of Desgranges & Huot guarantee the best metrological specifications on the market.
Functionality
The CPB6000DP is designed for differential pressure calibration at high static line pressure and consists of two gas operated pressure balances integrated into one common housing.
One side of a CPB6000DP can also be used as a single instrument for gauge pressure calibrations.
The differential pressure is defined on a single piston-cylinder assembly. The second piston-cylinder system is used as a memory for the zero condition. The operating procedure is to apply the same static pressure to both piston-cylinder assemblies with the measuring element floating.
Tarring masses are then applied to the comparison-memory element so that both pistons are balanced in their mid position.
The comparison element is then isolated and the mass equivalent to the differential pressure increment required is added to the measuring piston. The pressures on both sides are adjusted using the variable volume.
This ensures a very accurate measurement of differential pressures.
High accuracy
The exceptional intrinsic characteristics of high quality piston-cylinder systems allow the static pressure to be set and maintained with a precision much greater than the absolute accuracy on either piston-cylinder effective area.
The cross float consists of adjusting the mass load on one of the pistons until both pistons float together in equilibrium at the common static pressure.
Due to the sensitivity of Desgranges & Huot’s piston-cylinder systems this equilibrium can be realized within a tolerance of 1 ppm.