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Originally Posted by unregistered
where does the coolant 'go' over time ?
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Rhetorical question, I know - but is there such a thing as a material that is both flexible and completely non permeable to water? Even vinyl lets a little through, doesn't it?
If you scroll down to the bottom of this
Iwaki MD series PDF there's something called a "self priming chamber" which looks like an integral reservoir to me.
BTW, it's so un-bling that I'm tempted to get one if I ever get an Iwaki pump
And I'd definitely design one in if I was designing an X-ray machine or something, complete with fluid level sensor and alarm. Come to think of it, you could build a level sensor using the same principle they use to show the level in big coffee urns (clear tube up the side). Make the tube clear, float something opaque in it, use an optical switch to "notice" when the float has dropped past a certain point.
It's be cheaper and easier to use a pressure sensor in the pump-out line, but you'd be detecting "damage already done" - using a level indicator lets you bark while there's still plenty of coolant.