MRT Laboratories has a Refrigerant test package designed to monitor the usability of your refrigerant. The test package includes a Karl Fischer Water Titration down to 3 ppm, Total Acid Number, and High Boiling Residue.
This test package is not designed to ARI 700 specifications, but rather designed to simply determine if the refrigerant is suitable for continued use.
Both low and high pressure refrigerants can be tested. Special Sample Bombs are required and available on a limited basis