Abstract: A respiratory function monitoring device comprising a flow sensor and a conversion device is herein disclosed. Also disclosed are structures for carrying out an auto-zero calibration, a purging function, and temperature compensation. Methods for implementing the auto-zero calibration, the purge function, and the temperature compensation are also disclosed.

Abstract: A moisture absorbing media filter includes a housing into which a moisture absorbing material is placed, an end cap fabricated from a clear plastic fits over the housing, exhalations pass through the end cap into an impermeable tube which terminates at substantially the middle of a bore contained in the moisture absorbing material. A tapered chamber follows the impermeable tube and terminates at the end of the moisture absorbing material, a reduced passage follows a pellet filter and leads to an outlet opening, a dyeing agent is deposited into the tapered chamber, a predetermined amount of low vapor pressure, water soluble liquid is also deposited into the tapered chamber. Exhalations enter the inlet opening and pass through the impermeable tube into the tapered chamber, low vapor pressure, water soluble liquid deposited in the tapered chamber allows moisture in the gas to be absorbed by the moisture absorbing material but not the gas itself.

Abstract: A nondispersive infrared radiation source includes a base, a plurality of formed pins, a thick film resistor and an o-ring, the base has the shape of a cylinder and a plurality of grooves formed therein. A bore is formed in the base which is terminated by a bottom surface defined by a spherical radius. A reflective coating is applied upon the bottom surface. The plurality of formed pins are heat staked into the plurality of grooves and the o-ring is placed in one of the grooves. The thick film resistor comprises a substrate, a dielectric glass layer and a conductor layer, the substrate has a plurality of thick film resistors which are formed thereon. The plurality of thick film resistors are separated by use of a quadrapole laser. The thick film resistor is electrically connected to the plurality of pins with a solder connection.