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Toxic Sensors

NASA includes gold salt detectors and the color reference chart in ISS airlock contamination detection kit.
Gold Salt Hydrazine Detectors are part of the Contamination Detection Kit used in the International Space Station airlock to monitor astronauts for exposure to propellants during extra-vehicular activities. Propellant exposure turns the pad in the center of the sensor a purple or gray color and the intensity of the color change is proportional to the concentration
NASA

Due to our ongoing testing with propellants and propulsion systems at White Sands Test Facility, the development, evaluation, and qualification of toxic vapor sensors has been a natural progression. WSTF propellant vapor detection capabilities include design and development as well as evaluation of commercial portable and remote sensors. Our site evaluates these sensors by exposing them to gas streams ranging from combustion products to propellants such as monomethylhydrazine (MMH), hydrazine (N2H4), and unsymmetrical-dimethylhydrazine (UDMH) and dinitrogen tetroxide (NTO).

 Uses
Sensor technology is a rapidly growing field with great potential to improve the operations, reliability, serviceability, and utility of many engineering systems. Our toxic sensors are used for

  • personnel protection,
  • monitoring for residual propellant contamination,
  • fluid system leak detection, and
  • permeation testing of personal protective equipment (PPE).