This is the link which I have mentioned related to Hydrogen Purity Gas Analyzer. Currently we are going to purchase some spares of it. Here is the lists;
1) Valve Metering
2) Power Supply Unit
3) Flow Meter
4) Ring Seal Coupling
5) Seal Top Drying Chamber
6) Gauze Drying Chamber
7) Zener Diode MTL70SS
8) Safety Barrier MTL77SS
9) Indicator Display H2/Air
10) Khatarometer Unit
I am not so sure about all these listing but I got these from the ABB's guy. Therefore I need to check details each of the instrumentation parts.