Monitor residual chlorine without the need of buffers or reagents with ATI’s direct measuring membraned, polarographic sensor. This means no more costly reagents to purchase and stock. The system has no moving parts, so there are no pumps or motors to burn out or tubing to break that could cause maintenance nightmares. The sensor can be set up to measure either free or combined (chloramines) residual chlorine and can be provided with an optional pH sensor.