Why are Optrols Control/Monitors packaged in three separate units (Power Module, Control, and Monitor)?
Each of these functions has distinct mounting requirements. The Power Module needs to be convenient to the line power and replenisher pump power line. The Control needs to have access to etchant solution and gravity drain back to the etcher sump. The Monitor needs to be convenient for the operator. It can be nearly impossible to satisfy all these requirements at a single location on an etcher. It is however very easy to put each piece where it needs to be and then plug them together with the cables provided. This scheme also means that line voltage is confined to the Power Module and exposed to neither etchants nor operators.
