HBM P3IC, Инструкция по монтажу, Страница: 16 / 60

P3IC / P3ICP
16
A2382-3.0 en/de/fr HBM
6 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.
6.1 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.
6.2 PT100
The PT100 is not intended for measuring the measurement medium but
instead for measuring the temperature at the point of strain gage installation.
This enables compensation of any - possibly still existing - residual error
caused by temperature.
With P3IC, P3ICP, the PT100 is connected in a 2-wire configuration. If more
precise results are required, a transducer of our P3TCP series needs to be
used. With this series, the PT100 is connected in a 4-wire configuration (two
additional sense leads are available).