The Q46N Free Ammonia Monitor from Analytical Technology is designed for the continuous measurement of free ammonia, total ammonia and monochloramine in potable water. It is intended for monitoring chloraminated water to minimize the amount of excess ammonia in the system. It has a fast response time for real-time ammonia measurement, providing continuous, real-time updates for better process control. It uses a simple chemical system with three separate, inexpensive reagents required for operation. These reagents can be purchased directly or can be easily mixed on site using readily available chemicals. Each system is supplied complete with monitor, chemistry module, sensor membranes and electrolytes, reagent bottle brackets, reagent pickup tubing assemblies, a spare parts kit, and a manual. 800/959-0299; www.analyticaltechnology.com.