By alvius - 11/9/2020 11:01:09 PM
Hi,
I'm learning infusion and trying to get all the setup with minimal leaks. I'm using EC4 (i've fitted it with ball valve, vacuum gauge and air inlet valve), CP1 catch pot, Greisinger GDH 200-14 gauge at the very end. When pulling vacuum GDH 200-14 starts from 1012 mbar and drops to -2 mbar. Pump side gauge shows -1 bar, catch pot gauge shows -0.95 bar.
Questions.
1. I understand that gauges put closer/further from pump will show different values. Should I worry about GDH 200-14 showing -2 or it's just an measurement error I should ignore?
2. After pulling vacuum and clamping hose between pump and catch pot GDH 200-14 shows this:
@ 0 min -2 mbar
@ 5 min 34 mbar
@ 10 min 37 mbar
@ 15 min 38 mbar
@ 30 min 42 mbar
What is acceptable leak rate ?
|
By DD-Compound - 11/23/2020 9:06:25 AM
That’s a interesting leak rate. What I can see from your leak rate is moisture in your setup. Below 20mbar the water starts to vaporize and that lets the pressure drop dramatic at the beginning. After 5 min your leak rate is perfect.
I allow 1mbar/min. Usually that’s the leak rate where it stops to cause problems.
You should evacuate longer to get all moisture out, you will see that you won’t have that initial pressure increase then and your vacuum will be stable.
|
|