Wika CPB5000HP Manuel d'utilisateur télécharger pdf (Page 9)

Pressure Balance High-Pressure GB

CPB 5000 HP

WIKA Operating Instructions Pressure Balance High-Pressure Version 2.3

2.3.4 How the cross-sectional surface responds to pressure .

At higher pressures, the effective cross-sectional surface changes due to the pressure load.

The ratio of the cross-section and prevailing pressure is linear within an initial approximation. It is

represented by the coefficient of expansion caused by pressure distortion (λ).

pressure Nominal1

pressure Nominal

⋅+

pressureTrue

Example:

Measuring point: 1000 bar

System with distortion coefficient: 10

–7

1/bar:

barbarpressureTrue 90.999

10001011

1000

⋅

−

Without the correction, measurements would all be "off" by 0.01 %.

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Wika CPB5000HP Manuel d'utilisateur Page 9