Apparatus and method for monitoring the presence of volatile organic lead compounds

Claim 2

APPARATUS FOR CONTINUOUSLY MONITORING THE PRESENCE OF VOLATILE ORGANIC LEAD COMPOUNDS IN AN ATMOSPHERE AND AUTOMATICALLY PRODUCING A SIGNAL WHEN A PREDETERMINED AMOUNT OF LEAD COMPOUNDS IS DETECTED THEREIN WHICH COMPRISES, A TUBE OF LIGHT TRANSMITTING MATERIAL, IODINE CRYSTALS IN SAID TUBE, MEANS CAUSING THE IODINE CRYSTALS IN SAID TUBE TO BE EXPOSED TO THE ATMOSPHERE TO BE MONITORED BY DRIVING A STREAM OF AIR FROM THE ATMOSPHERE THROUGH THE TUBE, A PHOTO-OPTICAL SENSOR ADJACENT SAID TUBE SENSING A PREDETERMINED COLOR CAUSED BY LEAD IODIDE DEVELOPING ON THE INNER SURFACE OF THE TUBE, SAID PHOTO-OPTICAL SENSOR INCLUDING A LIGHT SOURCE POSITIONED ADJACENT THE TUBE IN THE AREA OF THE CRYSTALS, A PHOTOCELL POSITIONED ADJECENT THE TUBE IN THE AREA OF THE CRYSTALS AND RELATIVE THE TUBE AXIS ABOUT NINETY DEGREES FROM THE LIGHT SOURCE TO RECEIVE SCATTERED LIGHT FROM THE LEAD IODIDE IF IT DEVELOPS SAID PREDETERMINED COLOR, AND MEANS PREVENTING DIRECT ILLUMINATION OF THE PHOTOCELL FROM THE LIGHT SOURCE, AND ALARM MEANS DRIVEN BY SAID SENSOR AND TRIGGERED WHEN THE CRYSTALS ARE SUBJECTED TO A PREDETERMINED AMOUNT OF LEAD COMPOUNDS TO CAUSE SAID PREDERMINED COLOR TO PRODUCE SAID SIGNAL.

Claim 3

Apparatus for continuously monitoring the presence of volatile organic lead compounds in an atmosphere and automatically producing a signal when a predetermined amount of lead compounds is detected therein which comprises, a tube of light transmitting material, iodine crystals in said tube, means causing the iodine crystals in said tube to be exposed to the atmosphere to be monitored by driving a stream of air from the atmosphere through the tube, a photo-optical sensor adjacent said tube sensing a predetermined color caused by lead iodide developing on the inner surface of the tube, said photo-optical sensor including a light source positioned adjacent the tube in the area of the crystals, a photOcell positioned adjacent the tube in the area of the crystals and relative the tube axis about ninety degrees from the light source to receive scattered light from the lead iodide if it develops said predetermined color, and means preventing direct illumination of the photocell from the light source, and alarm means driven by said sensor and triggered when the crystals are subjected to a predetermined amount of lead compounds to cause said predetermined color to produce said signal.

Claim 4

Apparatus for continuously monitoring the presence of volatile organic lead compounds in an atmosphere and automatically producing a signal when a predetermined amount of lead compounds is detected therein which comprises, a tube of light transmitting material, iodine crystals in said tube, means causing the iodine crystals in said tube to be exposed to the atmosphere to be monitored by driving a stream of air from the atmosphere through the tube, a photo-optical sensor adjacent said tube sensing a predetermined color caused by lead iodide developing on the inner surface of the tube, said photo-optical sensor including a light source positioned adjacent the tube in the area of the crystals, a photOcell positioned adjacent the tube in the area of the crystals and relative the tube axis about ninety degrees from the light source to receive scattered light from the lead iodide if it develops said predetermined color, and means preventing direct illumination of the photocell from the light source, and alarm means driven by said sensor and triggered when the crystals are subjected to a predetermined amount of lead compounds to cause said predetermined color to produce said signal.

Claim 5

Apparatus for continuously monitoring the presence of alkyl lead in an atmosphere and automatically producing a signal when a predetermined amount of lead compounds is detected therein, said apparatus comprising a tube of light-transmitting material, a quantity of iodine crystals packed in the tube, means continuously pumping a part of the atmosphere through the tube and crystals, a yellow light source adjacent the tube in the area of the crystals, a photocell adjacent the tube in the area of the crystals and displaced about 90* from the light source, a light opaque shield between the light source and the photocell, and an alarm system connected to the photocell and triggerable when a predetermined amount of lead iodide develops on the inner surface of the tube in the area of the crystals to produce said signal.

Claim 6

Apparatus for continuously monitoring the presence of alkyl lead in an atmosphere and automatically producing a signal when a predetermined amount of lead compounds is detected therein, said apparatus comprising a tube of light-transmitting material, a quantity of iodine crystals packed in the tube, means continuously pumping a part of the atmosphere through the tube and crystals, a yellow light source adjacent the tube in the area of the crystals, a photocell adjacent the tube in the area of the crystals and displaced about 90* from the light source, a light opaque shield between the light source and the photocell, and an alarm system connected to the photocell and triggerable when a predetermined amount of lead iodide develops on the inner surface of the tube in the area of the crystals to produce said signal.