The electronics head contains the solenoid, oxygen sensors (4), sensor disk, sensor wiring harness, and oxygen injection premix tube. These components are responsible for analyzing the oxygen content of the breathing gas and injecting oxygen as needed.
The controller (Shearwater DiveCan system) interprets the readings from the oxygen sensors and makes decisions on when to add oxygen via the solenoid.
The injected oxygen travels through the premix tube to the exhalation side of the scrubber canister where it is blended with the loop gas before going through the scrubber material. This reduces 02 “spikes” by ensuring that the gas mixture is homogenous before passing over the oxygen sensors.