Re: Vacuum condition problem
Chriss,
This may help as see that permeation occurs in hoses & fitting leak if not "0" ring type.
http://alltemp.ca/wp-content/uploads...Presention.pdf
Re: Vacuum condition problem
Still not able to give you rep points Ranger.
An Interesting read all the same.
Thanks Grizzly
Re: Vacuum condition problem
I have seen similar vacuum rise, i think i read somewhere that is is because the volume of what you are measuring is so small (just the insides of the hoses) it should not behave the same way on a system. Also if they are new hoses they will give of fumes (new rubber smell) which will affect the vacuum reading until they have aged a bit.
Re: Vacuum condition problem
I Quote from Rangers Link!
Read the last paragraph in particular.
Always a good idea to attach a micron gauge to the vacuum pump to make sure the pump
pulls down to at least 50 microns.?
If it doesn’t, your pump oil is contaminated and should be changed.?
Do not shut off the blank-off valve on the pump and expect the gauge to hold a
vacuum as the gauge will fall back to atmosphere.
(The sensor in the gauge is too close to the pump and does not have time to
equalize).
Grizzly
2 Attachment(s)
Re: Vacuum condition problem
When i vacuum a big unit, I use these two gauges to make sure it stays or leak.
Attachment 14007Attachment 14008
Re: Vacuum condition problem
This is also interesting link, thanks for rep points ms.
https://www.youtube.com/watch?v=cI6pSBaskjc
Re: Vacuum condition problem
Do you ever sleep:D
Grizzly
Re: Vacuum condition problem
Quote:
Originally Posted by
Grizzly
Do you ever sleep:D
Grizzly
Grizzly the second link is the one I was looking for in the first place, as thought it was pretty good.
I look at things on IPhone a lot so can look anywhere at anytime.
Had about 9 hrs last night
Re: Vacuum condition problem
The only connecting lines that are absolutely vacuum tight are soft copper tubing or flexible metal hose