Portable battery-operated ambient air analyzer
First Claim
1. In a portable ambient air analyzer instrument of the type having an outer housing with means permitting the instrument to be carried by a person onto a site where gases exist and require measurement of the concentration thereof, said analyzer including an electrically-energized incandescent source producing a beam of infra-red radiation passing through a gas cell containing a gas sample and being directed thereafter to a sensor for analysis so as to produce measurements to be displayed, said analyzer further including manually-operable controls to permit the person carrying the instrument to select any of a variety of functional modes thereof;
- and a battery in said hosing to supply all of the electrical power required for the operation of said instrument including said incandescent source;
the improvement in said analyzer wherein said incandescent source comprises a pair of electrically-conductive elongate elements positioned side-by-side; and
a filamentary coil of wire secured at its ends to said elongate elements to receive electrical current therefrom;
said coil being self-supporting on said elongate elements, and its interior being free of any material, wherein the amount of radiation produced for a given amount of energy supplied to said source is approximately doubled relative to a mandrel-supported coil.
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0 Petitions
Accused Products
Abstract
A portable battery-operated ambient air analyzer comprising an electrically-energized incandescent source of infra-red radiation producing a beam passing through an air sample to a sensor. The infra-red source is surrounded by an explosion-proof enclosure to prevent an explosion internally of the enclosure being propagated out to the atmosphere. The incandescent source is a self-supporting filamentary coil having no interior core or mandrel. The coil is formed of a metal composition including aluminum, chromium and iron.
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Citations
7 Claims
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1. In a portable ambient air analyzer instrument of the type having an outer housing with means permitting the instrument to be carried by a person onto a site where gases exist and require measurement of the concentration thereof, said analyzer including an electrically-energized incandescent source producing a beam of infra-red radiation passing through a gas cell containing a gas sample and being directed thereafter to a sensor for analysis so as to produce measurements to be displayed, said analyzer further including manually-operable controls to permit the person carrying the instrument to select any of a variety of functional modes thereof;
- and a battery in said hosing to supply all of the electrical power required for the operation of said instrument including said incandescent source;
the improvement in said analyzer wherein said incandescent source comprises a pair of electrically-conductive elongate elements positioned side-by-side; and a filamentary coil of wire secured at its ends to said elongate elements to receive electrical current therefrom; said coil being self-supporting on said elongate elements, and its interior being free of any material, wherein the amount of radiation produced for a given amount of energy supplied to said source is approximately doubled relative to a mandrel-supported coil.
- and a battery in said hosing to supply all of the electrical power required for the operation of said instrument including said incandescent source;
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2. For analyzing the ambient air at sites where flammable or explosive gas mixtures may be present, a portable ambient air analyzer instrument of the type having an outer housing with means permitting the instrument to be carried by a person onto a site where gases exist and require measurement of the concentration thereof, said analyzer including an electrically-energized incandescent source producing a beam of infra-red radiation passing through a gas cell containing a gas sample and being directed thereafter to a sensor for analysis so as to produce measurements to be displayed, said analyzer further including manually-operable controls to permit the person carrying the instrument to select any of a variety of functional modes thereof;
- and a battery in said housing to supply all of the electrical power required for the operation of said instrument including said incandescent source;
the improvement in said analyzer which comprises; an enclosure fully surrounding said incandescent source of infra-red radiation and including means providing for explosion-proof operation of said source; said enclosure including; a central casing of generally tubular shape; first and second end plates secured to said central casing at opposite ends thereof and each formed with an opening; an infra-red window immediately adjacent said first end plate to allow infra-red radiant energy to pass from said incandescent source through said opening in the first end plate; the adjoining surfaces of said window and said first end plate being pressed together and formed flat and smooth; a lead support member fitted into said opening of said second end plate and having flange means extending beneath said second end plate interiorly thereof; the adjoining surfaces of said flange means and said second end plate being pressed together and formed flat and smooth; said end plates comprising means for restraining both said window and said lead support member from being expelled from said enclosure in the event of an internal explosion. - View Dependent Claims (3, 4, 5)
- and a battery in said housing to supply all of the electrical power required for the operation of said instrument including said incandescent source;
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6. For analyzing the ambient air at sites where flammable or explosive gas mixtures may be present, a portable ambient air analyzer instrument of the type having an outer housing with means permitting the instrument to be carried by a person onto a site where gases exist and require measurement of the concentration thereof, said analyzer including an electrically-energized incandescent source producing a beam of infra-red radiation passing through a gas cell containing a gas sample and being directed thereafter to a sensor for analysis so as to produce measurements to be displayed, said analyzer further including manually-operable controls to permit the person carrying the instrument to select any of a variety of functional modes thereof;
- and a battery in said housing to supply all of the electrical power required for the operation of said instrument including said incandescent source;
the improvement in said analyzer which comprises an enclosure fully surrounding said incandescent source of infra-red radiation and including means providing for explosion-proof operation of said source; said enclosure including; a central casing of generally tubular shape; an end plate secured to said central casing at one end thereof and formed with an opening; a lead support member fitted into said opening and having flange means extending beneath said end plate; the adjoining surfaces of said flange and said end plate being pressed together and formed flat and smooth; said lead support member being formed with a central opening; a glass plug in said central opening and fused to the inner surfaces of said central opening; a pair of tubes extending through said glass plug; and leads extending through said tubes and having internal extensions to support and supply electrical current to said incandescent source. - View Dependent Claims (7)
- and a battery in said housing to supply all of the electrical power required for the operation of said instrument including said incandescent source;
Specification