Control system for a four-component gas mixing unit

Resistive Plate Chambers (RPC), planned to be used in the ICAL detector of the Indian Neutrino Observatory (INO) project, need precise mixing of four different gases, as well as precise control of the flow rate of the mixed gas. The designed system has the capability to pre-mix the gases (static mode), which can be stored in a pressurized vessel for subsequent use. The unit can also dynamically control the ratio of the four constituent gases (dynamic mode) and deliver it at a controlled flow rate through the mixing volume to the RPC.