US 6,585,662 B1 · Pneumotachometer

Abstract

A disposable differential pressure pneumotachometer includes an inlet chamber having an air inlet, an outlet chamber having an air outlet, and a resistive element disposed between the inlet and outlet chambers. Air flow across the resistive element results in a pressure gradient which is measured to provide air flow rate. According to one aspect of the invention, the pressure port through which the static pressure in the inlet chamber is sensed is disposed in the outlet chamber. According to a further aspect of the invention, the resistive element comprises a bacterial filter material. Also described is a pneumotachometer in which at least one pressure port is covered with a bacterial filter material.

Claims20

Dependent claims

A differential pressure pneumotachometer comprising:

a housing having an inlet and an outlet;
a resistive element disposed between said inlet and outlet to divide said housing into an inlet chamber and an outlet chamber and to generate a pressure difference between said inlet chamber and said outlet chamber as air flows between said inlet chamber and said outlet chamber;
and
a pressure port disposed in said outlet chamber in isolated gaseous communication with said inlet chamber, wherein the pressure in said inlet chamber is sensed through said pressure port.

1 more element

Dependencies are inferred from the claim text.

Pneumotachometer

Life of this patent

Pneumotachometer

Life of this patent

Abstract

Claims20