Proline Cubemass C 500
Hauser
5
Symbols in graphics
Symbol
Meaning
1, 2, 3, ...
Item numbers
1.
,
2.
,
3.
, …
Series of steps
A, B, C, ...
Views
A-A, B-B, C-C, ...
Sections
-
Hazardous area
.
Safe area (non-hazardous area)
Flow direction
Function and system design
Measuring principle
The measuring principle is based on the controlled generation of Coriolis forces. These forces are
always present in a system when both translational and rotational movements are superimposed.
F
c
= 2 · ∆m (ν · ω)
F
c
= Coriolis force
∆m = moving mass
ω = rotational velocity
ν = radial velocity in rotating or oscillating system
The amplitude of the Coriolis force depends on the moving mass ∆m, its velocity ν in the system and
thus on the mass flow. Instead of a constant rotational velocity ω, the sensor uses oscillation.
In the sensor, an oscillation is produced in the measuring tube. The Coriolis forces produced at the
measuring tube loop cause a phase shift in the tube oscillations (see illustration):
• If there is zero flow (i.e. when the fluid stands still), the oscillation measured at points A and B has
the same phase (no phase difference) (1).
• Mass flow causes deceleration of the oscillation at the inlet of the tubes (2) and acceleration at the
outlet (3).
2
1
3
A0029932
The phase difference (A-B) increases with increasing mass flow. Electrodynamic sensors register the
tube oscillations at the inlet and outlet. System balance is ensured by the antiphase oscillation of the
two measuring tubes. The measuring principle operates independently of temperature, pressure,
viscosity, conductivity and flow profile.
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