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US 6,776,053 B2Granted
Flowmeter for the precision measurement of an ultra-pure material flow
AssigneeEmerson Electric Co.
InventorsMartin Andrew Schlosser, Mark James Bell, Matthew Glen Wheeler, Daniel Patrick McNulty, Gary Edward Pawlas
Life of this patent
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Abstract
A Coriolis flowmeter for the measurement of a process material requiring an ultra high level of purity. This is achieved by forming the entire Coriolis flowmeter of a PFA plastic material that does not transfer ions from the Coriolis flowmeter to the process material flowing through the flowmeter.
Claims44
A Coriolis flowmeter for measuring a process material flow having an ultra high level of purity, said Coriolis flowmeter comprising:
- a base;
- flow tube apparatus adapted to receive said process material flow, said flow tube apparatus is formed of a material, such as PFA, that does not transfer ions from said flow tube apparatus to said process material;
- end portions of said flow tube apparatus coupled to said base to create substantially stationary nodes at said end portions;
- a driver coupled to said flow tube apparatus for vibrating said flow tube apparatus containing said process material flow;
- pickoff means coupled signalwise to said flow tube apparatus for generating signals representing induced Coriolis deflections of said vibrating process material filled flow tube apparatus;
- and
- meter electronics that receives said signals from said pickoff means and generates output information pertaining to said process material flow.
4 more elements
A Coriolis flowmeter for measuring a flow of process material having an ultra high level of purity:
- said Coriolis flowmeter comprising:
- a single flow tube formed of a material, such as PFA, that does not transfer ions from said single flow tube to said process material;
- said single flow tube has high flexibility and further has a stiffness substantially lower than a metal or glass flow tube;
- the entirety of the wetted path of said Coriolis flowmeter comprises said PFA material;
- a driver coupled to said single flow tube for vibrating said single flow tube containing said process material;
- a massive base coupled by upwardly extending walls to ends of said single flow tube to absorb undesired vibratory forces generated by said vibrating flow tube;
- said base defines stationary nodes proximate opposing ends of said flow tube;
- an inlet connector connected to said massive base and adapted to receive a flow of said process material from a supply tube;
- an inlet end of said single flow tube is affixed to said inlet connector;
- said input connector sealably connects said inlet end of said single flow tube to an outlet end of said supply tube to effect the extension of said process material flow in said supply tube to said single flow tube;
- said inlet connector maintains said inlet end of said flow tube fixed with respect to said massive base;
- an outlet end of said single flow tube affixed to a second connector for extending said process material flow via an exit tube towards a user destination;
- a pair of pickoffs coupled to said single flow tube on opposite axial sides of said driver for generating signals representing Coriolis induced deflections of said vibrating material filled single flow tube;
- meter electronics;
- and
- conductors extending signals from said pickoffs to said meter electronics;
- said meter electronics receives said pickoff output signals and generates output information pertaining to said process material flow.
14 more elements
Dependencies are inferred from the claim text.