OMD 1700 Oxygen Analyzers are supplied together with auto purging systems for dirty fuel operations such as coal, COG and others. A purging air is applied to the analyzer 's filter at certain time periods and the sensor is cleaned from accumulated dusts and powders. For analyzers with ejector system (OMD 1700 - SS & OMD 1700 - CER), purging air is also supplied to the transfer pipe of the ejector and possible blockages are prevented. Auto purging systems are delivered with timer unit, pressure regulator, solenoid valves, necessary shut - off valves and tubings.