Deltapilot S
6 Endress+Hauser
Measuring principle
P01-DB5xxxxx-15-xx-xx-xx-003
Deltapilot S hydrostatic level measurement and measuring principle
1 Measuring diaphragm
2 Measuring element
3 Process diaphragm (separating diaphragm)
g Gravitational acceleration
h Level height
p
tot
Total pressure = hydrostatic pressure + atmospheric pressure
p
atm
Atmospheric pressure
p
hydr.
Hydrostatic pressure
p
meas
Measured pressure in the measuring cell = hydrostatic pressure
ρ Density of fluid
Due to its weight, a liquid column creates hydrostatic pressure. If the density is constant, the hydrostatic
pressure depends solely on the height h of the liquid column.
The CONTITE™ measuring cell which works on the principle of the gauge pressure sensor constitutes the core
of Deltapilot S. In contrast to conventional gauge pressure sensors, the precision measuring element (2) in the
CONTITE™ measuring cell is absolutely protected between the process diaphragm (3) and the measuring
diaphragm (1). Thanks to this hermetic sealing of the measuring element, the CONTITE™ measuring cell is
absolutely insensitive to condensate, condensation and aggressive gases. The pressure applied is transferred
from the process diaphragm to the measuring element by means of an oil without any loss in pressure.
Two temperature sensors are arranged between the process diaphragm and measuring element which measure
the distribution of temperature in the cell. The electronics can compensate any measuring errors resulting from
fluctuations in temperature with these temperature measured values.
h
h =
p
ρ · g
hp
hydr.
p
+
p
atm
p =
➀
➂
➁
p
atm
hydr.
p
p
atm
p
atm
ges
p
hydr.
p
+
p
atm
=
ges
p
)
hydr.
p
+
(p
atm
p
atm
p
mess
=
–
p
ges
p
atm
p
mess
=
–
p
ges
p
atm
p
mess
=
–
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