Coriolis sensor (general remarks) Some general remarks concerning all Coriolis sensors: • Dual-tube design / single-tube design • Dual-tube instruments are intrinsically balanced against external disturbances because the tube movements compensate each other. • Endress+Hauser puts extra effort into the design of single-tube instruments. With competitor’s single-tube instruments, vibration immunity is often a weak point. • Material choice • Stainless steel has a relatively large thermal expansion coefficient (= reacts to temperature raise with high expansion). If a steel meter is specified above 100 ºC, it has to feature bent tubes in order to avoid material damage due to thermal expansion stress. The same applies to most alloy materials (Hastelloy C). • Titanium has a lower thermal expansion coefficient. All straight tube meters specified above 100 ºC are made of titanium.
Overview of calculated values
• V=Volume flow V=m/r
• VN=Normvolume flow = Volume flow at fixed p and T VN= m/rN (note: rN is a fixed value for each fluid)
• c=Concentration Concentration can be calculated from density see specific training (advanced module)
• n=Viscosity Viscosity can be calculated from oscillation damping. Viscosity measurement is only available with the Promass I sensor
Advantages of Coriolis Mass Flowmeter
• Measurement of Conductive and Non-Conductive Liquids
• Standardisation on single flow technology
• Mass measurement independent of Temperature
• Improved process control and stability due to eliminating of temperature influence
• High accuracy / High repeatability • Improved process control due to reduction in fluctuation of measured value
• Measurement independent of viscosity and density changes
• High process stability with changing fluid properties
• High Operating Range
• Improved process control also at low flow condition
• No moving parts
• Reduced maintenance cost due to reduced wear and tear and improved operating time
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