The online particle counter PAMAS OLS4031 emerged from the standard particle counter PAMAS S4031. The standard shell is made of coated steel. For Phosphat-Ester applications, the PAMAS OLS4031 is manufactured with a special stainless steel shell that protects the housing from corrosive liquids. The integrated stepper-motor-driven pump guarantees a constant flow. The PAMAS OLS4031 online particle counter is equipped with 32 size channels.