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Low-cost radon detector
II
New Patents
4871681 METHOD FOR THE COLORIMETRIC DETERMINATION OF THE CYANIDE CONCENTRATION OF AQUEOUS SOLUTIONS
decay of the daughters produces pulses falling closely into pulse height ranges well above the noise threshold. Pulse counts and time lapse are monitored both long term and short term. 4873727 MARINE
Edgar Bilger, Hubert Wolf, Hasselroth, Federal Republic Of Germany assigned to Degussa Aktiengesellschaft According to the invention, cyanide concentrations of approximately 0.001 to 5 mg cyanide/1 are colorimetrically determined in a continuous manner by means of the known cyanidepicric acid color reaction. The solution containing free cyanide and/or cyanide releasable from cyanocomplexes is converted in a system enclosed in a gas-tight manner in the presence of chelate complexing agents, picric acid and alkaline buffer systems in 1-60 minutes at 50 degrees-120 degrees C. to the color complex and the absorbency is measured spectrophotometrically. The method avoids the extraction step which was previously necessary under 0.2 mg CN/1, avoids errors due to H C N gas evolution losses, is easy to manage, not prone to trouble and suitable for the continuous monitoring of waste-water streams or for controlling cyanide detoxification methods.
TOILET DEODORANT DISPENSER
Donald A Homan A marine toilet deodorant dispenser having intake and discharge pipes for integration into the existing intake flushing line and having a threadedly connected to a cap portion carrying an anti-siphoning device for controlling the fluid during quiescent periods, the cap portion further housing a perforated plastic container or canister enclosing a solid block of disinfectant deodorizer which chemically treats the flushing fluid for deodorizing the bowl of the waste disposal apparatus, accelerating the chemical break down of solid waste, reducing the precipitation and salt build up on plumbing fixtures, and filtering the flushing fluid, the plastic container or canister being conveniently replaceable.
4875031 VAPOR
MONITORING
SYSTEM
Ernest A Filippi, Kenneth L Miller 4871914 LOW-COST
RADON
DETECTOR
William E Simon, Thomas L Powers, Glenn W Ernsberger assigned to Sun Nuclear Corporation A low-cost radon detector using a solid state diode having a depletion layer disposed close enough to a test medium that alpha particles deposit their energy in the depletion layer. The signal produced by the diode is amplified and pulses are discriminated for levels over a threshold typical of pulse levels produced by radioactive decay of radon daughters on the surface of the sensor. More than one amplifier and threshold detector are provided, and the sensor can have plural solid state diodes. Pulses occurring exclusively on one channel are counted and pulses occurring in coincidence on more than one channel are ignored as instances of transient disturbance. A conductive enclosure around the sensor element can be biased to force radon daughter ions to plate out the sensor, whereupon
A hazardous gases detector that is completely self contained and small enough to fit into small diameter pipe bores. The system is housed in two sealed enclosures, one housing the detection circuits and batteries and the other the signal output. The two components are connected by a length of electrical cable. The invention detects BTX vapors in monitor well bores or piping connected to the detection volume of dual walled underground fuel storage tanks. The signal output end of the invention caps the well or conduit and suspends the sensor end in the well bore or conduit. The detection circuit and battery end is suspended ten feet or more below the gound level and thusly ensures uniform temperature, and thus stable performance of the detector. Circuits that time vapors sampling interval provide long term operation from a battery comprised of six standard D size cells, leak detection is signaled by blinding lights and horn, with two weeks of signal capacity in the battery, a minimum. Internal non-reversible indication of leak detection is also provided. The lower housing is intrinsic safe by pressure containment and the upper housing by current limitation. The system can be varied
New Patents
4871681 METHOD FOR THE COLORIMETRIC DETERMINATION OF THE CYANIDE CONCENTRATION OF AQUEOUS SOLUTIONS
decay of the daughters produces pulses falling closely into pulse height ranges well above the noise threshold. Pulse counts and time lapse are monitored both long term and short term. 4873727 MARINE
Edgar Bilger, Hubert Wolf, Hasselroth, Federal Republic Of Germany assigned to Degussa Aktiengesellschaft According to the invention, cyanide concentrations of approximately 0.001 to 5 mg cyanide/1 are colorimetrically determined in a continuous manner by means of the known cyanidepicric acid color reaction. The solution containing free cyanide and/or cyanide releasable from cyanocomplexes is converted in a system enclosed in a gas-tight manner in the presence of chelate complexing agents, picric acid and alkaline buffer systems in 1-60 minutes at 50 degrees-120 degrees C. to the color complex and the absorbency is measured spectrophotometrically. The method avoids the extraction step which was previously necessary under 0.2 mg CN/1, avoids errors due to H C N gas evolution losses, is easy to manage, not prone to trouble and suitable for the continuous monitoring of waste-water streams or for controlling cyanide detoxification methods.
TOILET DEODORANT DISPENSER
Donald A Homan A marine toilet deodorant dispenser having intake and discharge pipes for integration into the existing intake flushing line and having a threadedly connected to a cap portion carrying an anti-siphoning device for controlling the fluid during quiescent periods, the cap portion further housing a perforated plastic container or canister enclosing a solid block of disinfectant deodorizer which chemically treats the flushing fluid for deodorizing the bowl of the waste disposal apparatus, accelerating the chemical break down of solid waste, reducing the precipitation and salt build up on plumbing fixtures, and filtering the flushing fluid, the plastic container or canister being conveniently replaceable.
4875031 VAPOR
MONITORING
SYSTEM
Ernest A Filippi, Kenneth L Miller 4871914 LOW-COST
RADON
DETECTOR
William E Simon, Thomas L Powers, Glenn W Ernsberger assigned to Sun Nuclear Corporation A low-cost radon detector using a solid state diode having a depletion layer disposed close enough to a test medium that alpha particles deposit their energy in the depletion layer. The signal produced by the diode is amplified and pulses are discriminated for levels over a threshold typical of pulse levels produced by radioactive decay of radon daughters on the surface of the sensor. More than one amplifier and threshold detector are provided, and the sensor can have plural solid state diodes. Pulses occurring exclusively on one channel are counted and pulses occurring in coincidence on more than one channel are ignored as instances of transient disturbance. A conductive enclosure around the sensor element can be biased to force radon daughter ions to plate out the sensor, whereupon
A hazardous gases detector that is completely self contained and small enough to fit into small diameter pipe bores. The system is housed in two sealed enclosures, one housing the detection circuits and batteries and the other the signal output. The two components are connected by a length of electrical cable. The invention detects BTX vapors in monitor well bores or piping connected to the detection volume of dual walled underground fuel storage tanks. The signal output end of the invention caps the well or conduit and suspends the sensor end in the well bore or conduit. The detection circuit and battery end is suspended ten feet or more below the gound level and thusly ensures uniform temperature, and thus stable performance of the detector. Circuits that time vapors sampling interval provide long term operation from a battery comprised of six standard D size cells, leak detection is signaled by blinding lights and horn, with two weeks of signal capacity in the battery, a minimum. Internal non-reversible indication of leak detection is also provided. The lower housing is intrinsic safe by pressure containment and the upper housing by current limitation. The system can be varied