Flow instrument with multisensors
First Claim
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1. An instrument for use in sensing fluid flow, comprising:
- a flow body comprising an inlet, an outlet and a flow restrictor coupling the fluid flow from the inlet to the outlet;
a first multisensor having a first sensing surface in the inlet that senses an inlet pressure and temperature of the fluid;
a second multisensor having a second sensing surface in the outlet that senses an outlet pressure and temperature of the fluid; and
a circuit that couples to the first and second multisensors, the circuit generating a fluid flow output based on outputs of the first and second multisensors, the fluid flow output including a temperature correction as a function of at least one of the sensed temperatures in the inlet and the outlet.
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Abstract
An instrument used to control fluid flow. The instrument has a flow restrictor between an inlet and an outlet. First and second multisensor have sensing surfaces in the inlet and outlet that sense pressures and temperatures of the fluid flow. A circuit generates a mass flow output based on a difference between the pressure in the inlet and the pressure in the outlet. The mass flow output including a temperature correction as a function of at least one of the sensed temperatures in the inlet and outlet.
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Citations
30 Claims
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1. An instrument for use in sensing fluid flow, comprising:
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a flow body comprising an inlet, an outlet and a flow restrictor coupling the fluid flow from the inlet to the outlet;
a first multisensor having a first sensing surface in the inlet that senses an inlet pressure and temperature of the fluid;
a second multisensor having a second sensing surface in the outlet that senses an outlet pressure and temperature of the fluid; and
a circuit that couples to the first and second multisensors, the circuit generating a fluid flow output based on outputs of the first and second multisensors, the fluid flow output including a temperature correction as a function of at least one of the sensed temperatures in the inlet and the outlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of controlling fluid flow through an instrument, comprising:
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coupling the fluid flow from an inlet to an outlet through a flow restrictor;
sensing an inlet pressure and temperature of the fluid with a first multisensor having a first sensing surface in the inlet;
sensing an outlet pressure and temperature of the fluid with a second multisensor having a second sensing surface in the outlet;
coupling the first and second multisensors to a circuit generating a fluid flow output; and
generating the fluid flow output based on the pressure selected from the group of the inlet pressure and the outlet pressure, the fluid flow output including a temperature correction as a function of at least one of the sensed temperatures in the inlet and outlet. - View Dependent Claims (28, 29, 30)
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Specification