Oil test for Bitzer CO2 compressors

[Pmap]

Hi guys, I'm looking for OIL acidity test for BITZER R744 compressors. I've tried ETK and TKO test which haven't work. I could have the test done in laboratory but I'd rather have a quick test for servicing.

Thanks

[M Villalobos]

What Kind of Oil you have? if its a POL/Alkibenze or Mineral you can use TA-1 or AK-3 from Sporlan these are the best in my opinion.

[Pmap]

I'm using BSE85K from Bitzer, it seems to be a kind of POE but when i'm opening a new can with a POE test it's always turning to ACID.