DIN EN ISO 20843:2011-04

This document contains the German translation of the international document ISO 20843-3:2011, which has been prepared by Technical Committee ISO/TC 28 "Petroleum products and lubricants", the secretariat of which is held by ANSI (USA), in collaboration with Technical Committee CEN/TC 19 "Gaseous and liquid fuels, lubricants and related products of petroleum, synthetic and biological origin". The responsible national committee is NA 062-06-81 AA, Mirror Committee of CEN/TC 19 "Gaseous and liquid fuels, lubricants and related products of petroleum, synthetic and biological origin" of the Petroleum, Fuels, Lubricants and Related Products Standardization Committee (NMP). This International Standard specifies a test method to determine the pH of fire-resistant fluids within categories HFAE, HFAS and HFC, as classified in ISO 6743-4. HFAE, HFAS and HFC fluids are used in hydraulic systems where the running conditions require fire-resistant fluids. The determination of the pH of aqueous hydraulic fluids is useful to monitor the product in service. Any important variation can be the sign of bacterial proliferation and can have an impact on the corrosion-protection properties.