Evaluation of a Portable Mass Spectrometer for Measuring Monomethylhydrazine and Nitrogen Tetroxide in Air.
Abstract
Monomethylhydrazine (MMH) and nitrogen tetroxide (N2O4) propellant leaks from the Minuteman III postboost propulsion system can result in personnel and operational hazards. A breadboard-model pulsed-leak quadrupole mass spectrometer (referred to as the Minuteman III toxic vapor detector (TVD), specifically designed to monitor both propellants, was evaluated. Low-level concentrations were used to establish firm detection limits. Test results are presented. The TVD was determined inadequate as a base on which to recommend building a prototype instrument without further major design and development effort. Sensitivity to MMH in air was on the order of 5-10 ppm (0.2 ppm is a minimum design requirement), and response times at lower concentrations of MMH were greater than 10 minutes (10 sec 'show' and 60 sec 90% of full response are required). Deviation of MMH concentrations versus response curves from linearity indicated poor instrument resolution and an unacceptable potential for false alarm. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1976
- Accession Number
- ADA027824
Entities
People
- H. J. Kilian
- L. J. Luskus
Organizations
- United States Air Force School of Aerospace Medicine