Quote Originally Posted by ptjw7uk View Post
Just a thought have you put a diode on the relay to stop spikes when the relay operates.
Peter

not tryed it yet but i will have a go later and see if it works and report back.
i was looking into using a solenoid to press a micro switch so there isnt any contact with the controller and plasma gun. but if the diode works it will save me a lot of messing about 
thanks