Vac oven....how low can YOU go?

[Zumie]

So I recently invested in an Across International vac oven and I hooked up my 2 stage "Robinair" mom deal 15500 which is rated at 5 CFM. My elevation is 6500' ;-) yup D-Town,

My question is, how do I achieve vacuum levels greater than ~650mmHG??? It seems like I cannot go any lower than that no matter how long I let it pull. Before I consider the option of a stronger pump I wanted to see if anyone else has had the same issue.

Thanks!!!

 

[shiftypickle]

your gauge is measuring off of ambient pressure and getting a bad reading, i have a 1.9 and its great for the fact that it holds a vac but beside that its shit. notice how the face of your gauge is probably plastic?

 

[Lono]

your gauge is measuring off of ambient pressure and getting a bad reading, i have a 1.9 and its great for the fact that it holds a vac but beside that its shit. notice how the face of your gauge is probably plastic?

Is there anything else you don't like about it?

Anything you don't like about it op?

I'm a soon-to-be owner. Definitely interested to hear your opinions.

Also, here is this:

https://www.icmag.com/ic/showthread.php?t=286508

 

[shiftypickle]

i like the fact that it was half the price of caskade tek lol, though they will undoubtedly be my next vacuum solution

 

[Gray Wolf]

So I recently invested in an Across International vac oven and I hooked up my 2 stage "Robinair" mom deal 15500 which is rated at 5 CFM. My elevation is 6500' ;-) yup D-Town,

My question is, how do I achieve vacuum levels greater than ~650mmHG??? It seems like I cannot go any lower than that no matter how long I let it pull. Before I consider the option of a stronger pump I wanted to see if anyone else has had the same issue.

Thanks!!!

Full vacuum at 6500' is about 24.5" Hg, so your correction factor is 5.42" Hg. For instance, at 6500 feet elevation, 29.5" Hg would read on your calibrated gauge as 24.1" Hg gauge.