Some input please.
I have fought with micron levels while bench testing a new micron guage. I need another brain, mine is exhausted.
Should I forsake the micron idea and just focus on standing pressure and vacuum tests? Books say it works. I've even done it many many times. Now it won't work. Makes no sense to me. I'm out of time to keep bench testing this high- tech, battery operated,micron detecting expensive junk. The old-timers weren't so bad huh!
Somebody throw me a line! I'm not a new comer to this field. I've been here a long time.
Thanks to you all!
I have the following symptoms. Test includes #1 vacuum pump, one new refrigeration hose connected to the pump, and new digital micron guage #1.
1. micron level down to 400 microns,valved pump #1 off.
2. Pump turned off.Levels of microns climb rapidly to unacceptable levels.
3.Installed 2nd isolation valve to seal before hose connection at pump.Same results.Microns climb just as fast.
4. Same test,new refrigeration hose.(I mean a new one!)
5. Buy new micron guage.Performed all the same tests as above with new micron guage.Hmmph!The exact same symptoms.
6.Pulled out my "Not so old" analog micron guage,same equipment above.Performed same test.Same results.Microns climb just as fast as always.I even used a second valve a second time to isolate the pump.Nothing bettered.
Fittings good shape,not scratched or pitted.Every concievable idea I have thought of I have done.Still,no worky.
Trash all of this equiment? It is new! I know not of another culprit that it could be. I could condemn the new digital micron guages as a bad design,but the same symptom exists with my analog guage I've had all along. It's not the guages. It's not the hoses. It appears the micron target just cannot be maintained once the pump is isolated. Why? I don't know. Do any of you?
I even used copper tubing instead of a hose! Same symptom.