The chlorine sensor from the eCHEM sensors product range is an electronic sensor for measuring the chlorine concentration in water. The sensor measures the concentration of total chlorine in a sample created by adding inorganic chlorine products (e.g. chlorine gas, sodium hypochlorite solution, calium hypochlorite solution). The measuring method has a reduced pH dependency, so that pH value fluctuations only have a minor influence on the measuring signal. By regularly replacing the electrolyte and the membrane cap, the sensor performance can be guaranteed and ensured over a longer period of time.