ATI’s Q45N Dissolved Ammonia Monitor measures total ammonia, free ammonia or monochloramine with 4 to 20 mA outputs for each and two-alarm relays. The unit uses reaction chemistry to convert ammonia in solution to a stable monochloramine compound equivalent in concentration to the original ammonia level. The chloramine concentration is then measured with a unique amperometric sensor that responds linearly to chloramines while eliminating interference from excess free chlorine in solution.www.analyticaltechnology.comsales@analyticaltechnology.com