K12330 Oxidation Stability Apparatus, 30- & 60-Unit



Test Method
Evaluates oxidation stability by subjecting the sample to a temperature of 95C 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.

Features and Benefits

• Conforming to ASTM and related test method specifications

• Convenient operation and servicing of thirty or sixty test cells

• Complete bath temperature, water level, air flow and condenser water systems

K12330 Oxidation Stability Apparatus, 30- & 60-Unit

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.

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
*Modified versions of this equipment are available for ASTM D2893 “Oxidation Characteristics of Extreme Pressure Lubricating Oils” and AOCS CD12-57 “Fat Stability Active Oxygen Method.’’ Information will be furnished upon request.

Temperature Control Stability: 0.1C (0.2F)

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)

Available option for 30- and 60-place Oxidation Baths–temperature/pressure recorder with built-in alarms for low pressure and over/under temperature. Please contact Koehler for specifications and ordering information.

Electrical Requirements
30-place model: 220-240V, 50/60Hz, Single Phase, 28A
60-place model: 220-240V, 50/60Hz, Single Phase, 54A
Other electrical configurations are available upon request.

Dimensions lxwxh,in.(cm)
30-place model: 43x55x52 (109x140x132)
60-place model: 43x78x52 (109x198x132)

Shipping Information
Shipping Weight:
30-place model: 892 Ibs (404.6kg)
60-place model: 995 lbs (451.3kg)
30-place model: 94 Cu.ft.
60-place model: 148 Cu.ft.

Ordering Information



Product Description

Electrical Requirements


Oxidation Stability Apparatus, 30-Unit

220-240V 60Hz


Oxidation Stability Apparatus, 30-Unit

220-240V 50Hz


Oxidation Stability Apparatus, 60-Unit

220-240V 60Hz


Oxidation Stability Apparatus, 60-Unit

220-240V 50Hz




Product Description

ASTM D943, D4310, and D2274 Accessories
For ASTM D2274, order one each K122-0-18 Oxygen Delivery Tube, K122-0-19 Oxidation Test Tube, and K122-0-20 Condenser for each cell.


Oxidation Cell Assembly for ASTM D943 and D4310.
Includes oxidation cell, condenser, oxygen delivery tube, thermometer bracket, oil level indicator strip, syringe sampling tube, sampling tube holder, spacer,


Oxygen Delivery Tube


Oxidation Test Tube




Thermometer Bracket


Oil Level Indicator Strip


Syringe Sampling Tube Holder


PTFE Stopper


Syringe Sampling Spacer


Syringe Sampling Tube



Iron-Copper Catalyst. For ASTM D943 and D4310.


Catalyst Coil
Low-metalloid steel wire and electrolytic copper wire wound in a double spiral conforming to ASTM specifications. Packed in a sealed glass tube with a nitrogen atmosphere. Ready for use.


Wire Coiling Mandrel
Mounts on bench for winding steel and copper wire into catalyst coils meeting ASTM specifications.


Steel Wire
Low metalloid steel wire, 0.0625" (1.59mm) diameter, for catalyst coils. Supplied in 1000 ft (304.8m) lengths.


Copper Wire
Electrolytic copper wire, 0.064" (1.63mm) diameter, for catalyst coils. Supplied in 1000 ft (304.8m) lengths.


Silicone Carbide Paper
Used to polish steel and copper wire prior to winding into catalyst coils. 100 grit.



Oxidation Cell Thermometer. For ASTM D943 and D4310.
Range: 80 to 100C.


ASTM 40C Thermometer. For constant temperature baths.
Range: 72 to 126C.


When inquiring about NIST traceable certified thermometers, please refer to the catalog number for the corresponding thermometer and replace the middle three zeros in the catalog number with 004. Example: 251-000-01C ASTM 1C Thermometer would be 251-004-01C ASTM 1C Certified Thermometer.