Patent ID: 9291571
Filing Date: 2016-03-22
CPC Classification: G01N

Claim Text:
1. An ammonia gas detection apparatus, comprising: an ammonia sensor positioned proximate a gas stream that is configured to detect an ammonia gas in the gas stream and to generate a first output signal when the ammonia gas is detected in the gas stream; a discoloration gauge positioned proximate the gas stream that includes a reaction solution that changes from a first color to a second color, different from the first color, responsive to exposure to the ammonia gas in the gas stream, regardless of a presence of an interference gas, and a detector that generates a second output signal responsive to the reaction solution changing from the first color to the second color, wherein the discoloration gauge comprises: a communication interface that outputs the first output signal and the second output signal to a host computer that detects presence of the ammonia gas in the gas stream based on the first output signal and the second output signal.