Instrument block for potentiostatic chlorine measurement with the following integrated components ready for plate mounting : - dirt trap with 0.5 mm mesh size - DN 2.5 needle valve - Standpipe with overflow - gold electrode - stainless steel electrode - balls for electrode cleaning - flow monitor (float element and reed contact) - potential compensating pin Holes for accommodation of the reference electrode for chlorine measurement, the PH and redox electrode and the Pt 100 thermometer probes are provided Sampling water connection hose liner for tubing d6i Sampling water discharge 1 x cemented connection PVC d12