We have recently upgraded to a HD machie from our old Powermax and I have been training my guys to use it.
Everything was fine until one of them decided to turn the unit on before refitting the quick-disconnect torch head with the loss of some of my coolant.
Now I know that this was obviously a very stupid thing to do but it has made me think that surely there should be a safety interlock arrangement so that if this sort of thing happens then the pump should not start and therefore prevent the loss of coolant.