Multiple-gas NDIR analyzer

An infrared analyzer comprising:

• a source of infrared radiation, said source emanating infrared radiation onto an infrared radiation path;
• a sample cell for containing an analyte gas, said sample cell being interposed in the path of infrared radiation emanating from said source;
• at least one optical element which receives infrared radiation after the infrared radiation passes through said sample cell;
• an optical housing for holding said at least one optical element, said housing having an interior surface, wherein said at least one optical element is disposed within said optical housing;
• at least one infrared radiation reflecting surface on said interior surface of said optical housing, wherein said at least one infrared radiation reflecting surface is coated with a highly reflective material;
• and
• at least one infrared radiation detector for providing an indication of the absorption of infrared radiation by the analyte gas, said at least one infrared radiation detector receiving infrared radiation from said at least one optical element.

A gas analyzer comprising:

• a gas inlet wherein an analyte gas enters the gas analyzer;
• a base plate having gas passages molded therein, said gas passages coupled to said gas inlet;
• a source of radiation, said source emanating radiation onto a radiation path;
• a sample cell for containing at least a portion of the analyte gas, wherein said sample cell is coupled to said gas passages and is interposed in the path of radiation emanating from said source;
• and
• at least one detector for providing an indication of the absorption of radiation by the analyte gas, said at least one detector receiving radiation after the radiation has passed through said sample cell.

An infrared analyzer comprising:

• a source of infrared radiation, said source emanating infrared radiation onto a infrared radiation path;
• a sample cell for containing an analyte gas, said sample cell interposed in the path of infrared radiation emanating from said source;
• a first optical element to transmit a first portion of infrared radiation that said first optical element receives from said sample cell and reflect a second portion of the infrared radiation that said first optical element receives from said sample cell, wherein the first portion and the second portion each comprise a substantially identical energy spectrum;
• a first narrow band pass filter receiving the first portion;
• a first detector detecting infrared radiation that passes through said first narrow band pass filter;
• a second optical element, said second optical element receiving the second portion, reflecting substantially all infrared radiation within the second portion having a wavelength above a first predefined wavelength and transmitting substantially all infrared radiation within the second portion having a wavelength below a second predefined wavelength, wherein the first predefined wavelength is greater than the second predefined wavelength;
• a second narrow band pass filter receiving infrared radiation reflected by said second optical element;
• a second detector detecting infrared radiation that passes through said second narrow band pass filter;
• a third optical element, said third optical element receiving infrared radiation transmitted by said second optical element, transmitting substantially more than 50% of the infrared radiation received from said second optical element having a wavelength within a narrow band pass and reflecting substantially more than 50% of the infrared radiation received from said second optical element having a wavelength outside the narrow band pass;
• a third narrow band pass filter receiving the infrared radiation reflected by said third optical element;
• a third detector detecting infrared radiation that passes through said third narrow band pass filter;
• and
• a fourth detector detecting infrared radiation transmitted by said third optical element.

A gas analyzer module set comprising:

• means for inputting data;
• a processor coupled to said inputting means;
• means for outputting data coupled to said processor;
• and
• an non-dispersive infrared (NDIR) analyzer coupled to said processor, wherein said NDIR analyzer comprises:
• a source of infrared radiation, said source emanating infrared radiation onto an infrared radiation path;
• a sample cell for containing an analyte gas, said sample cell interposed in the path of infrared radiation emanating from said source;
• and
• a first infrared radiation detector;
• a second infrared radiation detector;
• at least one optical filter for receiving at least a portion of the infrared radiation that passes through said sample cell, wherein said at least one optical filter is oriented to transmit infrared radiation within a narrow wavelength band to said first infrared radiation detector and to reflect infrared radiation outside of the narrow wavelength band to said second infrared radiation detector.

A gas analyzer comprising:

• a source of radiation, said source emanating radiation onto a radiation path;
• a water filter comprising an inlet, an outlet and a hydrophobic membrane disposed between said inlet and said outlet, said water filter receiving a sample gas at said inlet, removing water from the sample gas at said hydrophobic membrane and thereafter transferring the sample gas through said outlet;
• a sample cell for containing at least a portion of the sample gas received from the water filter and receiving radiation from said radiation source, wherein part of the radiation received by said sample cell is absorbed by the sample gas;
• and
• at least one detector for providing an indication of the absorption of radiation by the sample gas, wherein said at least one detector receives radiation that passes through said sample cell.

A water filter for use in a gas analyzer, wherein said water filter comprises:

• an inlet for receiving an analyte gas;
• a hydrophobic membrane for receiving the analyte gas from the inlet and removing water therefrom;
• and
• an outlet for receiving the analyte gas after it passes through the hydrophobic membrane.