The Foxcroft FX-1000p is a true, on-line chlorine analyzer for free or total chlorine residual readings. It can be used for monitoring or control in fresh water, wastewater, and food processing applications, with a high degree of accuracy and repeatability. It is capable of handling ranges from .1 ppm to 60 ppm without dilution. The FX-1000p is a low maintenance analyzer designed to operate continuously and economically, using ordinary 5% distilled vinegar as a pH buffer and cleaning agent.