The ideal test to determine the air release properties of petroleum oils.

31 Jul 2019

Rowe Scientific Pty Ltd would like to announce the latest product from Koehler, the K88539 Automatic Air Release Value Analyser. This innovative instrument is commonly used to determine the ability of a turbine, hydraulic or lubricating oil to separate entrained air. This is a key performance characteristic in applications where agitation causes a dispersion of air bubbles in the oil.

The test method

In order to discern air release properties, the sample is heated to a specified test temperature and blown with compressed air. After the air flow is ceased, the time required for the air entrained in the oil to reduce in volume to 0.2% gives the air bubble separation duration.

Key features

596-koehler-air-release-analyser_03Includes an integrated touch screen control panel, which guides the user from start to finish of the test operation, and provides density calculations and timing operations for measuring the air release value of the test sample. 

The test unit conforms to the American Society for Testing Materials (ASTM) D3427, IP313 and related specifications. Included is an integrated circulating bath and balance, an air bath for the sinker, an automatic lift system that moves the test vessel from air source to balance sinker, and also automatically measures the time for air release for maximum convenience and reliability.


Other state-of-the-art features include an integrated circulation bath with water level indicator, integrated balance, air tube security clamp mechanism and automatic jacketed test vessel draining.

Safety features include compressed air heater overtemperature and overpressure protection circuitry. 

Included accessories

  • Sinkers, 5mL and 10mL
  • Integrated Balance
  • Integrated Circulator
  • Air Bath for Sinker
  • Tubing and Fittings
  • Platinum Wire
  • Jacketed Test Vessel

A drying oven is available as a supplemental accessory for warming test oil to temperatures of up to 100°C


Temperature range: Ambient to 75°C

Sample Temperature Stability: ±0.1 °C

Air Temperature Stability:  ±0.2 °C

Density: ±0.001 g/mL

Download PDF Download the brochure

For further information or for a quote please contact your nearest Rowe Scientific representative.