Measurement; Measuring Dynamic Pressures - HBK P3 Montageanleitung

9

MEASUREMENT

In order to achieve perfect results when measuring pressure, it is essential when setting
up the measurement chain to take the correlations between the absolute pressure, the
gage pressure and the atmospheric pressure into account.
Because of their mechanical structure with the hermetically sealed reference chamber,
transducers of all the 10...3000 bar measuring ranges only measure the absolute pres­
sure. Under certain conditions, it is also possible to measure gage pressure with an abso­
lute pressure transducer. The atmospheric pressure is then tared away electronically.
Dead volume and any liquid or gas volumes that may exist on the customer side can also
invalidate the measurement result.
9.1

Measuring dynamic pressures

Calibration related to static pressures is also applicable when measuring dynamic pres­
sures. Please note that for measurement frequencies in the natural frequency range,
amplitude reinforcements are to be expected.
With dynamic stress, the pressure maximums must not be greater than the nominal
(rated) pressure. The oscillation width (peak‐to‐peak) of the permissible pressure fluctua­
tion must not become greater than 70 % of the full scale value.
18
P3
MEASUREMENT