P3
…
/P3 Top Class
20
A2239-3.0 en/de/fr
HBM
7
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 pressure. Under certain conditions, it is also possible to measure
gage pressure with an absolute 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.
7.1
Measuring dynamic pressures
Calibration related to static pressures is also applicable when measuring
dynamic pressures. 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 permiss
ible pressure fluctuation must not become greater than 70 % of the full scale
value.
