Minuteman III Toxic Vapor Detector.
Final rept. Jun 71-Mar 73,
HONEYWELL INC MINNEAPOLIS MINN SYSTEMS AND RESEARCH CENTER
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A survey was made of candidate methods for detection and measurement of liquid propellant leakage monomethylhydrazine and nitrogen dioxide in the Minuteman III environment. A feasibility demonstration was made of a new concept for a toxic vapor detector, and a breadboard model was designed, fabricated, and evaluated. The design approach and evaluation program are described. The toxic vapor detector performs a continuous sequence of measurements by virtue of self-contained digital logic circuitry. Real-time measurements are made over a range of 0.2 to 100 ppm for monomethylhydrazine and 5 to 500 ppm for nitrogen dioxide. Readouts include visual displays, voltages, and audiovisual alarms. Testing showed that the toxic vapor detector does not respond to specified background gases including internal combustion engine exhaust. The tests revealed that atmospheric reactions may take place between the propellant gases and certain of the background gas e.g., nitrogen dioxide in the presence of an easily oxidized compound. The measurement sequence can involve the detection of products resulting from propellant-atmosphere reactions, and it does involve measurement of argon whose fixed concentration in the atmosphere provides a continuous, self-calibration feature. A development program involving an electric field ion pump for maintaining this vacuum is described. Modified author abstract
- Inorganic Chemistry
- Test Facilities, Equipment and Methods