Abstract: A hydrogen gas analyzer having an improved delivery system is provided wherein a plurality of branched passageways can supply a sample cell and an additive fuel to a combustion chamber. Cutoff valves can be activated to control the flow rates through the respective passageways so that when the concentration of hydrogen in the sample gas is high, the flow rate from the additive fuel will be reduced, and when the concentration of hydrogen is low, the flow rate of the sample gas is reduced.

Abstract: An infrared ray detector assembly for detecting a plurality of components such as hydrocarbons, CO.sub.2 and CO gases includes a housing member having a hollow interior and a portion transmissible to infrared rays and a holder member mounted within the hollow interior and having a plurality of separate compartments. An infrared detector is mounted in each compartment, and an optical filter is mounted over each compartment, abutting adjacent filters to respectively limit the wavelength band to each infrared detector, each optical filter having a substrate of approximately the same material and thickness.

Abstract: A fluid analyzer having a light source, a cell for receiving fluid to be analyzed and reference fluid and positioned to receive light from the light source, a detector positioned for receiving the output from the cell, and a light source body having inner reflective walls with a curved profile in the direction extending between the light source and the cell for forming a first focal point at one end thereof and a second focal point at the other end thereof. The light source is positioned in the light source body substantially coincident with the first focal point, and the other end of the light source body extends around the end of the cell which is toward the light source and with the second focal point within the cell.

Abstract: The absorption analyzer of the type provided with light sources (3a, 3b), cells (1, 2) containing a reference gas and an ingredient gas to be measured, respectively and a detector (5) for determining the absorption of the light emanating from the light sources and passing through the cells, is additonally equipped with a gas filter (8) arranged in the optical path between said light sources and the detector and contains an ingredient gas with an absorption spectrum band that nearly corresponds to that of an ingredient gas to be measured or an ingredient to be measured. The advantage of the invention is that a relatively large range of concentrations of gas ingredients can be measured with the same type of cells having the same cell length.

Abstract: A diaphragm for use as a pressure receiving and dislocatable member in a condenser-type microphone detector. The diaphragm electrode is a thin metallic film member having a central movable portion, a supporting frame portion around the outside of and spaced from the central movable portion, and at least three supporting spring portions at equal intervals around the periphery of the central movable portion and connected between the central movable portion and the supporting frame portion for permitting the central movable portion to be moved out of the plane of the supporting frame portion by differential pressure across the opposite sides of the central movable portion. The central movable portions can have holes therein for partly relieving the pressure thereon.

Abstract: An apparatus for intermitting beams of light for use in a gas analyzer in which a rotary shaft of a chopper is supported by first and second ball bearings. An outside ring of the first ball bearing is fixedly mounted on a bearing housing and either an inside ring or an outside ring of the second ball bearing is adapted to be movable in the thrust or axial direction relative to the rotary shaft, whereby the second ball bearing is movably energized in the thrust direction by an elastic member to eliminate shake of the rotary shaft due to play in the ball bearings and thus reduce modulation noise to improve measuring accuracy of the gas analyzer.

Abstract: A sample gas is introduced into a sample cell housed in a cell block. A self-operated temperature-controlling type heater is disposed within the hollow place of the cell block and said sample cell is indirectly heated by the heat from said heater.

Abstract: A gas analyzer has a generally cylindrical cell having cell windows closing the opposite ends thereof and which are infrared passing materials and pipes for passing a sample gas through the cell, a source of infrared radiation at one end of the cell, a chopper at the other end of the cell, and a sensing part of the other end of the cell on the opposite side of the chopper from the cell. The sensing part has a plurality of dual pyroelectric sensors spaced around the axis of the cell and each having a pair of elements constituted by a light receiving element for receiving infrared radiation which has passed through the cell and an auxiliary element, the pair of elements in each sensor being positioned substantially radially relative to the axis of the cell with the light receiving element radially inwardly of the auxiliary element and lying within the cross-section of the inner peripheral surface of the cylindrical cell and the auxiliary element lying outside the cross-section.

Abstract: An infrared radiation gas analyzer for determining the concentration of an ingredient in a sample gas has a sample gas container for containing a sample gas at a temperature at which the ingredient the concentration of which is to be determined will emit infrared radiation in a range characteristic of the ingredient and a window for allowing the infrared radiation to escape from the container. A pair of filters is provided, one of the filters transmitting only radiation in the range and the other of the filters transmitting only radiation in a range near to the firstmentioned range. A disc with the filters thereon rotates in front of the window for passing the filters across the path of radiation escaping from the container.

Abstract: An infrared radiation gas analyzer for determining the concentration of an ingredient in a sample gas has a sample gas container for containing a sample gas at a temperature at which the ingredient the concentration of which is to be determined will emit infrared radiation in the range characteristic of the ingredient and a window for allowing the infrared radiation to escape from the container. An optical chopper outside said container interrupts the radiation escaping from the container. A pair of filters is positioned in the path of the radiation escaping from the container and spaced transversely of the path, one of the filters transmitting only radiation in the range and the other of the filters transmitting only radiation in a range near to the first mentioned range.

Abstract: An infrared radiation gas analyzer for determining the concentration of an ingredient in a sample gas has a sample gas container for containing a sample gas at a temperature at which the ingredient the concentration of which is to be determined will emit infrared radiation in a range characteristic of the ingredient and a window for allowing the infrared radiation to escape from the container. An optical chopper is positioned outside the container for interrupting the radiation escaping from the container. A filter is positioned in the path of the radiation escaping from the container and transmits only radiation in the range. An infrared radiation detector is positioned for receiving the radiation passed by the filter and emitting a signal representative of the radiation received by the detector and which is representative of the concentration of the ingredient the concentration of which is to be determined in the sample gas.

Abstract: A detector for a single beam pneumatic infrared analyzer having two light receivers, a front receiver and a rear receiver positioned in series in the path of infrared light rays coming from a sample cell and each of which has a gas enclosed therein and used for measuring the concentration of a sample flowing through the sample cell by comparing the different absorption spectra of the infrared rays hitting the two receivers, and a screening device in front of the front light receiver for screening out the infrared rays in only the peripheral portions of the light, along the light path entering the front receiver.