Combustion Products Monitor: Trade Study TestingCurrent combustion products monitoring on the International Space Station (ISS) uses a handheld device (Compound Specific Analyzer-Combustion Products, CSA-CP) containing electrochemical sensors used to measure the concentration of carbon monoxide (CO), hydrogen chloride (HCl), hydrogen cyanide (HCN), and oxygen (O2). The CO sensor in this device accounts for a well-known cross-sensitivity with hydrogen (H2), which is important, as ISS air can contain up to 100 ppm H2. Unfortunately, this current device is being discontinued, and due to space constraints, the new model cannot accommodate the size of the current CO sensor. Therefore, a trade study was conducted in order to determine which CO sensors on the market were available with compensation for H2, and which instruments used these sensors, while also measuring HCN, O2, and carbon dioxide (CO2). The addition of CO2 to the device is helpful, as current monitoring of this gas requires a second hand-held monitor. By providing a device that will monitor both combustion products and CO2, volume and up-mass can be reduced as these monitors are delivered to ISS.
Document ID
20170002222
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Wallace, William T. (Wyle Labs., Inc. Houston, TX, United States)
Trowbridge, John B. (Wyle Labs., Inc. Houston, TX, United States)
Date Acquired
March 14, 2017
Publication Date
December 1, 2011
Subject Category
Spacecraft Instrumentation And AstrionicsMan/System Technology And Life Support