Maybe PCON can destroying PSCN and NSCN? @jacob1
I think the PSCN and NSCN would be destroyed after activation.
If you set powered converter to WATR, all particles around will be converted into water. You need to have PSCN and NSCN in powered converter's radius. So, If you turn on powered converter, PSCN and NSCN will be turned into something else (like water) and you won't be able to switch off it.
Actually it would be quite helpful in some cases. It could work like ray emitters, like, if it receives the pscn spark from the left, it converts the particle on its right.