What is the difference between a 402R configured for 100% H2 fuel and one configured for a 40/60 mixture?
A 402R analyzer is not designed to switch between two different types of fuel without modification to the sample system. The sample system is either built for the standard 40/60 mix fuel, or for 100% H2 fuel. The fuel type is specified at the time of purchase. A sample system built for 100% H2 fuel is built with a lower flow restrictor in the fuel gas line. This limits the flow of 100% H2 to 30 scc/m instead of the standard 200 scc/m.