ATI's new Q46H chlorine monitor is the upgraded version of the Q45H system for continuous monitoring of free or combined chlorine. This system uses a polarographic membraned sensor to measure chlorine directly, without the need for chemical reagents. When needed, automatic pH compensation may be added for highest free chlorine measurement accuracy. Q46H monitors are available with a digital communications or three 4-20 mA outputs for chlorine, pH and temperature.