How The Cross-Sectional Surface Responds To Pressure - WIKA CPB 3000 Betriebsanleitung

Pressure Balance
CPB 3000

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).
Nominal
=
True pressure
λ
+
1
Example:
Measuring point: 1000 bar
System with distortion coefficient: 10
=
True pressure
+
1 1
Without the correction, measurements would all be "off" by 0.01 %.
WIKA Operating Instructions Pressure Balance Version 1.1
pressure
⋅
Nominal pressure
–7
1/bar:
1000
=
bar 999
⋅ − ⋅
7
10 1000
. 90 bar
GB
.
9