Leak Checking

Sampling additional air from the surroundings probably is the most common form of measurement error. Small leaks are difficult to detect because the exhaust gas usually contains some oxygen. Leaks are common because the joints in the sample line often are disturbed (i. e., when connecting a sample line to a new vehicle or when changing a filter). Leaks can be found by overflow checking the sampling system with nitrogen or a cocktail mixture of several reference gases (e. g., NOx, HC, and CO).

Добавить комментарий

Ваш e-mail не будет опубликован. Обязательные поля помечены *