Details test and examination criteria for flammable vapor sensor systems and components for use in gas-burning appliances. This standard applies to a flammable vapor sensor or system capable of operating throughout a temperature range of 32鳩 (0鳦) to 12
ANSI Z21.94a-2007 history
2007ANSI Z21.94a-2007 Automatic Flammable Vapor Sensor Systems and Components (same as CSA 6.31a)