Hi AHA,

I have been looking into creating something like your describing when I get time.

It would have been handy, had a mould surface breach in a tiny place, after the infusion even after pre testing for vaccum.
Had to baby sit it for hours as I don't like leaving the pump running constant, but I do have a degassing chamber attached to the line to act as a vacuum air pig.

RS has a range of adjustable vacuum switches, this norgren switch operates in the -1bar to -0.2bar range.

Hope helped.

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David Stevens
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Is there a reason you want to turn the pump off? From an electrical point of view, there would be less damage to the pump to leave it running than switching it on and off under load.

Thank you for the replies . I am after a switch that will turn the pump on and off and keep the vacuum at the required pressure so the pump is not on all the time . I have a regulator  to adjust the pressure .All I need is a  automatic electric pressure  switch?

That will regulate the vacuum but not turn off the pump.
If you turn the pump off without turning off a valve you will find your Pump oil gets sucked out, so I don't think you want what you are asking for.

Brian.

Like so? 

Hi where can I find a regulator switch to put on my vacuum pump ,so when its up to the required pressure it switches off automaticly and switches on when required .