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Evaluates oxidation stability by subjecting the sample to a temperature of 95°C in the presence of oxygen or dry air. For inhibited mineral oils, the sample is reacted with oxygen in the presence of water and an iron-copper catalyst.

Available models

Conforms to the specifications of
ASTM D943, D2274, D2893*, D4310, D6158; ISO 4263, 12205 AOCS CD12-57*; DIN 51586, DIN 51587; NF M 07-047; NF T 60-150
Temperature Control Stability
±0.1°C (±0.2°F)
Oxygen Flow Rate
3L/h to each test cell, individually controlled
Bath Capacity
30-place model: 60 gal (227L) 60-place model: 114 gal (432L)

Constant temperature water baths for high volume oxidation stability applications. Provides temperature control, metered air flow and condenser water supply controls for as many as thirty or sixty cells in a single system, eliminating the need for multiple water and electrical feeds and oxygen supply tanks. Microprocessor PID control provides quick temperature stabilization without overshoot, and the bath is protected by a redundant overtemperature control circuit that interrupts power should bath temperature exceed a programmed cut-off point. Display provides actual setpoint temperature values in °C/°F format. Communications software (RS232, etc.), ramp-to-set and other enhanced features are available as extra cost options. A 6 or 12kW heat exchanger with heavy duty magnetic drive circulation pump provides rapid and uniform heat transfer throughout the bath. Bath liquid depth is automatically maintained within ASTM specified tolerances by an electronic water level control system. Two banks of individually controlled flowmeters maintain the required oxygen flow rate to each test cell, and condenser water control valves for each cell are mounted on manifolds along the sides of the bath. A centrally mounted trough collects condenser waste water for convenient disposal or recirculation through an external cooling device. Bath interior is constructed of heavy gauge welded stainless steel. All components are easily accessible for servicing if required. Supplied with a sturdy finished angle-iron frame for floor standing installation. Order oxidation cell glassware and accessories separately.


  • Thirty and sixty-place liquid baths for high volume testing requirements
  • Conforming to ASTM and related test method specifications
  • Special baths for ASTM D2893 and AOCS CD12-57 tests
Conforms to the specifications of
ASTM D943, D2274, D2893*, D4310, D6158; AOCS CD12-57*; DIN 51586, 51587; ISO 4263, 12205; NF M 07-047; NF T 60-150
Testing Capacity
12 oxidation cells
Maximum Temperature
Temperature Control Stability
±0.2°F (±0.1°C)
Air Flow Rate

Constant temperature aluminum block oxidation bath with flowmeters and condenser water manifold for twelve cells. Insulated solid block design provides efficient operation at temperatures of up to 450°F (232°C). Microprocessor temperature control unit features digital setpoint and display and built-in overtemperature protection. Includes individual flowmeters and control valves for each cell, delivering air flow at the rate of 3L/h. Condenser water manifold has individual control valves for each cell. Order oxidation cell glassware and accessories separately.


  • Accommodates twelve oxidation cells
  • Microprocessor digital temperature control
  • Conforming to ASTM and related test method specifications
  • Special baths for ASTM D2893 and AOCS CD12-57 tests
  • Chemical
  • Education & Academics
  • Environmental
  • Oil & Gas
Koehler Instrument CompanyProviding quality testing instrumentation and technical support services for research and testing laboratories has been our specialty since 1925. Meeting your testing needs is the primary focus of our business, which is why Koehler Instrument Company is a leading producer and supplier of petroleum, synfuels and petrochemical instrumentation worldwide. At Koehler, we pride ourselves in innovation. In a time of continuous technological advancement and transition we are constantly implementing new and improved ways to surpass the needs of an ever-evolving industry. Koehler products are backed by our staff of technically knowledgeable, trained specialists who are experienced in both petroleum products testing and instrument service, which is carried out either on site or at a Koehler service center.
[koehler instrument, flash point testing, ASTM compliance, petroleum products, petroleum testing, Oxidationn stability]