The working principle
•
The pressure is applied on the piston, and turns it
linearly into a perfectly proportional force that is
transferred to the measuring force cell.
•
A microprocessor calculates the force corresponding
to the pressure, corrects it for all the environmental
influences and finally transfers the pressure value to
the display and to the communication interface.
•
The measuring force cell permanently measures and
interpolates the pressure-generated force.
Absolute and gauge mode
Two models of CPD8000 are available according to your
needs :
CPD8000-G: Gauge mode only
Dedicated to gauge measurements, the force cell is let at
the atmospheric pressure.
CPD8000-A: Absolute and gauge mode
Versatile measurer, the force cell is placed in reference
chamber which can be at the atmospheric pressure for
gauge measurement or vacuum for absolute measurement.
The measurer is placed under a
reference vacuum
chamber
:
•
Absolute pressure measurement is a simple and fast solution,
it allows to
measure in continue an absolute pressure
without to have to break the vacuum
between each
pressure point as it is necessary with the classical pressure
balances.
•
The vacuum realised on the measuring block and in
the reference chamber is around 2 Pa.
CPD8000 basic principle
P
F
A
=
CPD8000-G
CPD8000-A
Page 2 of 8
Desgranges & Huot WIKA Data Sheet CPD8000 04/2012
