I dont get it, what does that have to do with my post. You wanna know how much I spend on tools....lots.
Originally Posted by engine chiller
I always buy the best, thats why I'm looking at that ananlog gauge.
A man is no less a slave because he is allowed to choose a new master once in a term of years.
used it for 18 yrs. many big wrenches here use it or are familiar with. it' s a hermetic wet bulb t-meter, using carbinol (a type of alcohol). using a small amount, and care not to boil it off too quikly, the resulting temp. will correspond to your level of deep suk(tion). -12 on vacuator = 35 for aqua,5.2mm, 5200 mics. a little more sensitive to vac level rise, no merc to spill, no batterys, no calibration.
Originally Posted by txhvac
OK, The reality of it is that the Vac-u-Ator is the only frickin non-electronic vacuum testing instrument out there today. With the acceptable evacuation tolerances being a little loose(in my opinion), we just have to trust the instrument of our choice. Pull a large volume Centrifugal down to 1000 microns and let it stand for 12 hours. It is acceptable to have a 25oo micron rise... That is where I start questioning myself. But it is what it is. I would trust that anyone that has done 10-20 teardowns has had issues with a leaker. They're not fun. You finish a little ahead of time and wham your chasing a GD ghost. I did get the literature from Vac-U-Ator and after reading it makes me want to trust it a little more. Anyway, Thanks for all of your input, it really is a personal choice.
It just pisses me off that I can get a 400 ton 134a screw system down to 300 microns and get it to hold. But most times these low pressure machines are harder to pull down. It must have something to do with the large volume in the machine itself???
So which is available or better
I read through this entire thread and didn't find my answer.
Are mercury manometers available and at what cost to measure vacuum down to what would be 500 microns?
Or what is the alternate option for an accurate and reliable wet bulb to measure vacuum to 500 microns, such as the Vac-U-Ator, and what is its cost?
Or just get a micron meter and take chances?
I have a Robinair analog micron gauge, I really like it and it is very accurate. It cost me around $450.00
thermal engineering vac-checks industry standard around here http://www.thermalengineeringcompany...?p=12&cat_id=2
Just a beginner
Even though I am just a beginner in A/C, I do understand what you are saying due to my 45 years of previous mechanical experience.
Let's see if anybody chimes in on this interesting procedure.