Oil Test Kit, Phase III Refrigeration Oil

4320-W8 MFG #: 4320-W8
  • Buyer PART
  • Brand Nu-Calgon
  • Hazardous Material Yes
  • Type Oil
Nu-Calgon Phase III® Clear, Oil Acid Test Kit for Refrigeration

The concentrate of acid in refrigeration oil is expressed as an acid number in mg of KOH per gram of oil (milligrams of potassium hydroxide per gram of oil). The acid number is a measure of the amount of hydroxide solution needed to neutralize the acid in the oil. The more acid there is in the oil, the more potassium hydroxide is needed to neutralize it and, so, the higher the acid number. In the Phase III test, an acid number of 0.05 mg KOH per gram of oil has been set as the maximum acceptable acid concentration in mineral oil and alkylbenzene oil. In polyol esters, the number is generally accepted as 0.16 mg. Mineral and alkylbenzene oils with an acid number less than 0.05 mg or POE’s with an acid number less than 0.16 mg are acceptable and will cause no change in the color of the test kit’s acid indicator. However, if the respective oils have an acid number greater than these limits, it will cause the acid indicator to change from purple to pink or clear indicating that the oil is contaminated.

Features & Benefits

  • Simple - phase separation makes it easy to see color changes in acid indicator
  • Universal- use one kit for mineral oil, alkylbenzene, poe and pve oils
  • Precise - phase iii is a highly accurate service tool that can save expensive compressor repair and replacement costs
  • Handy size - several phase iii test kits can be carried conveniently in a tool box
  • Formulated for use with poes as well as mineral oils and alkylbenzene, phase iii is an inexpensive, disposable test kit that provides proof-positive that acid level in refrigeration oil is either safe or unsafe
  • Phase separation makes it easy to see change in color of acid indicator
  • With just two bottles to use, it is simple, safe, accurate and small enough that you can carry several in your tool box


  • Color/Finish: Clear
  • Used On Item: Refrigeration System
  • Physical State Liquid
  • Relative density 0.9048
  • pH Value 10.9
  • Includes (1) Large Bottle of Solvent Solution, (1) Small Bottle of Neutralizing Solution
  • Used for Mineral Oil, Alkylbenzene Oil Like Zerol, EMKARATE RL and Copeland Polyol Ester, Polyvinyl Ether (PVE) Lubricant