Precision Pressure and Level Measurement
System Description (MPICUW)
This fully digitized, intelligent measuring system is suitable for very
accurate pressure and level measurements up to 0.05 %. At the same time,
the calculation of volume and gradient as well as a temperature measurement
are also integrated. The system comprises a pressure
sensor (submersible
probe/pressure sensor), SENSORbus,
the latest technology in
processing
unit with LED display and operation as well as various interface boards.
The equipment, designed for rough industrial use, can be used for pressure
measurements as well as for hydrostatic and pneumatic level measurements.
Measuring Principle
The latest technology in hysteresis-free silicon pressure sensor
with an integradet µP converts the mechanical variable pressure into
an electrical signal. This pressure-proportional signal is processed in
the transducer electronics, linearised and transmitted via the SENSORbus
to the processing
unit as a noise-free signal.
The digital pressure signal is processed in the unit MPICUWN. The
level is precisely determined under consideration of the liquid specific
paramenters densitiy rho and compressibility ß, the local gravitational
acceleration g, as well as the temperature T. The calculation of differentials,
mean values as well as the coarse/fine measuring method can be programmed.
Furthermore, the gradient and, with the function V = F(H), the volume can
be calculated and output.
Coarse / Fine Measuring Method
 |
The intelligent processing unit MPICUWN offers the possibility of
the coarse/fine measuring method in order to increase the accuracy.
This is meaningful for levels which seldom fall below a certain level (eg
water table). For this purpose, the same level is acquired with 2 pressure
sensors.
Procedure:
In the upper range, the level is only measured with pressure sensor
MPIS1. Due to the small range, the measurement proves to be much
more accurate than would be possible with MPIS2. Should the level
sink below pressure sensor MPIS1, this results in a flowing measured
value sequence so that no measured value jumps occur. |
Advantages
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Uses 1 ... 2 pressure sensors with integrated µP technology
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Digital communication to the pressure transducers via the SENSORbus
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Easy parameterisation of the measuring system via operating
matrix or PC
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High flexibility and expansion capability due to the modular design
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Short installation/start-up times
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Very robust high long-term stability
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For pressure and level measurements
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Very high accuracy of 0.05 % for pressure as well as for level measurement
-
Accuracy achieved under consideration of density, temperature and compressibility
of the medium and the local gravitational acceleration
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Measuring ranges up to 200 bar (3'000 psi)
-
maximum functionality on site with calculation of volume, gradient and
tendency
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Increased accuracy and safety by the calculation of mean values
-
Very precise level measurement with the coarse/fine measuring method
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