Instrumentarium Corporation

General Electric Company

Instrumentarium Oy

Kai Karlsson

Kurt Peter Weckstrom

Timo Merilainen

Borje T Rantala

Heikki Haveri

Timo Holopainen

Kurt Weckström

Seppo Poikolainen

Mikael Alanen

Jani Kauppi

Anne Paykkonen

A liquid separator removing a liquid from a sample of a breathing gas flowing through an airway adapter having a channel surrounded by a wall is disclosed herein. The separator includes a chamber receiving the sample, and a membrane having an outer surface exposed to the gas flow, the membrane at least partially surrounding the chamber, which membrane separates the liquid received by the chamber. The separator also includes a supporting structure for supporting the membrane, and a connector operationally attached to the supporting structure, the connector being connectable to the adapter. The connector comprises a cavity providing a flow path for the sample from the chamber through an opening of the cavity to a sample tube. The membrane branches from a central part of the channel into at least two different branches extending to different directions.

Liquid separator for removing a liquid from a sample of a breathing gas and airway adapter

A method for controlling a respiratory gas monitor device, which includes at least one respiratory gas analyzer, a gas sampling line, a gas pump for sucking sample(s) of respiratory gas from the gas sampling line. Also included are a power supply and a processing unit, and a pressure sensor connected to the gas sampling line and electrically connected to the processing unit. A minimum value and a maximum value in a signal from the patient are detected by the processing unit, and a difference between the minimum value and the maximum value is calculated. The value of this difference is compared with a predetermined threshold value. If the calculated difference is below the threshold value, the pump is switched off or kept non-operating by the processing unit. If the calculated difference is over the threshold value, the pump is switched on or kept operating by the processing unit.

Controlling the operation of a respiratory gas monitor

A non-dispersive infrared measuring arrangement for a multigas analyzer is described having a radiation source (), a measuring chamber (), a beam splitter (), at least a first and a second detector unit () both with at least two detectors (); and optical filters in radiation beam portions ending in said detectors. The detector units receive the reflected beam portions (R) and the transmitted beam portion (R). Both the first and second detector units () have: at least one measuring detectors () provided with an optical measurement filter (); and at least one reference detectors () provided with an optical reference filter (). Alternatively, the first detector unit () has at least two measuring detectors () each provided with an optical measurement filter (), and the second detector unit () has at least two reference detectors () each provided with an optical reference filter (). The first detector in said first detector unit and said second detector in said second detector unit are positioned to constitute a first independent single path analyzer channel (), and said second detector in said first detector unit and said first detector in said second detector unit are positioned to constitute a second independent single path analyzer channel ().

Detection assembly and measuring arrangement for multigas analyzers

The invention relates to a method and an apparatus for non-dispersive analysis of gas mixtures for determining the concentration of such a first gas component in a gas mixture, whose absorbance may be influenced by other gas components of said gas mixture. The apparatus comprises a sample chamber () for containing the gas mixture, a radiation source () for transmitting radiation through the gas mixture, a first optical transmission band filter () with a first absorption transmission band of the first gas and a first radiation detector (). The apparatus further comprises a second optical transmission band filter () with a second transmission band, which is outside the first transmission band, and a second detector (). The concentration determining means () are arranged to determine the concentration of the first gas using a certain formula or formulas and using the detected intensities. The second transmission band is substantially or entirely outside the absorption bands of said first gas component and comprises a second absorption band of a certain gas component causing a distortion in the absorption band of the first gas component, the strength of the second absorption band being substantially less than the strength of the first absorption band.

Method and arrangement for determining the concentration of a gas component in a gas mixture

The invention relates to an additional feature for use in a measuring sensor which is used for analyzing mediums spectroscopically. The measuring sensor comprises: a radiation source (1), emitting radiation which travels through a first window (3a) of a sample chamber (2), an absorption length (L1) and further a second window (3b) of the sample chamber (2), the sample chamber being provided, if necessary, with flow connections for a gas mixture; at least done detector (9), which is optically directed towards the second window; at least one optical filter (8), which is permeable to a certain wavelength band, or a radiation dispersion device between the radiation source and the detector. Between the first sample chamber window and the radiation source, the feature comprises a length (L2) and/or, between the second window and the detector, a length (L3), totalling at least about 20% of the absorption length. The length (L2) between an inner surface (13a) of the first sample chamber window and the radiation source and/or the length (L3) between an inner surface (13b) of the second window and the detector or, respectively, detectors are constituted over substantially all other sections of the radiation path, except those in alignment with possible accessories, by a solid material (7) transmissive to the applied radiation wavelengths. This material is preferably homogeneous at least in the direction transverse to a main radiating direction (R).

Additional feature for a measuring sensor used in the spectroscopic

Infrared radiator has a heating element (1) heated by electric current and a first thermocouple (2) thermally coupled to the heating element to measure its temperature. According to the invention, the first thermocouple (2) is electrically so connected to the heating element (1) that the electric current used to heat the heating element flows through the thermocouple. The invention allows the temperature of the heating element to be measured without the use of a separate temperature detector, which would cause problems.

Infrared radiator

The invention relates to an infrared radiation source for a gas analyzer and a method for generating infrared radiation. The infrared radiation source comprises a body (6), thermal insulation material (5) adapted inside the body (6), a radiant element (1) fitted inside the insulation material (5), elements (2, 3) for feeding electric energy to said radiant element (1), and a channel (7) formed in said body (6) and said thermal insulation material (5) in order to pass the radiation generated by said radiant element (1) to the gas under measurement. According to the invention, at least the thermal insulation material (5) adapted in close proximity to the radiant element (1) has a low thermal conductivity and the emissivity of the radiant surface (11) adapted in close proximity to the radiant element (1) is greater than 0.5 at the operating temperature of the source.

Infrared radiation source for a gas analyzer and method for generating

A method for calibrating a gas analyzer (1). A gas analyzer is calibrated by measuring the zero level of the analyzer (1). The level of the analyzer is measured, after a preceding reset, whenever a temperature variation (.DELTA.T) of an infrared sensor (14) included in the analyzer (1) or of a component thermally connected in a highly conductive manner thereto exceeds a predetermined threshold value (A), or the temperature variation rate (D) of the infrared sensor (14) of the analyzer (1) or of a component thermally connected in a highly conductive manner thereto exceeds a predetermined limit valve.

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Helsinki, Finland

Kai Karlsson