K70200 Oxidation Stability Bath, RBOT / TFOUT


Test Method
The RBOT procedure employs severe oxidation conditions to rapidly determine oxidation stability. Suitable for both new and in-service oils, the RBOT method is applicable to many types of petroleum oils. The sample is oxidized in the presence of water and a copper catalyst in a stainless steel pressure vessel under an initial pressure of 90psi (620kPa). Pressure inside the vessel is recorded electronically or mechanically while the vessel is rotated at 100rpm at constant temperature, and the amount of time required for a specified drop in pressure is the oxidation stability of the sample. A variation of the RBOT method is the “Thin Film Oxidation Uptake Test” (TFOUT) for gasoline automotive engine oils.

Features and Benefits
• Two, three and four-pressure vessel models

• Conforming to ASTM requirements for RBOT and TFOUT testing


K70200 Oxidation Stability Bath, RBOT / TFOUT
Constant temperature bath rotates oxidation pressure vessels at 100rpm at an angle of 30 in accordance with ASTM specifications. Includes drive system and oil bath with electronic solid state temperature control. Meets ASTM requirements for heat transfer capability and temperature control precision.

A convenient carriage arrangement allows the oxidation vessels to be inserted quickly and securely in the drive system. A strong magnet holds the vessel in place while locating pins in the carriage engage the base of the vessel. PTFE guides support the pressure vessel stem for added stability. If the vessel becomes obstructed for any reason, the magnetic carriage releases it to prevent damage. A chain and sprocket drive system powered by a heavy duty capacitor start motor rotates the vessel carriages at 100rpm. Drive shafts ride on PTFE fluorocarbon bearings which provide extended service and are compatible with silicone heat transfer fluids and other types of bath oils.

Bath temperature is controlled within ASTM specified limits by an electronic solid state controller with C/F switchable digital setpoint and display. Overtemperature protection is provided by a built-in limit control that automatically interrupts power to the bath when bath liquid temperature exceeds 16.7C (30F) above the temperature setting or 177C (350F). Power must then be manually restored by the operator after checking the cause of the problem. Pressure vessel carriage vanes circulate the bath oil during testing to ensure temperature uniformity, and an auxiliary stirrer can be operated between tests to prevent sludging of non-silicone bath oils.

The bath interior is constructed of welded stainless steel and is fully insulated. A hinged section of the bath cover provides easy access to the vessel carriages. Vapor barriers in the cover close around the vessel stems to contain vapors from the hot bath medium. A chemical resistant polyurethane finish protects the bath exterior and control cabinet.

Conforms to the specifications of: ASTM D2112, D2272, D4742; IP 229

Capacity: 2, 3 or 4 oxidation pressure vessels

Maximum Temperature: 200C (392F)

Control Stability: 0.02C (0.04F)

Heater Range:
2 and 3-pressure vessel models: 0-2750W
4-pressure vessel models: 0-3750W

Drive System: 100rpm positive drive transmission powered by a continuous duty 1/2hp ball bearing motor with built-in gear reducer

Recommended Bath Medium: high temperature silicone heat transfer fluid (355-001-002)

Ordering Information





Electrical Requirements

Bath Capacity
gal (L)


Net Weight

Shipping Weight, Dimensions


2 oxidation vessels

220-240V 60Hz, 17.17A

18 (68)


237 lbs

356 lbs
25.3 Cu. ft.


220-240V 50Hz, 17.17A


3 oxidation vessels

220-240V 60Hz, 17.17A

25 (95)


284 lbs

416 lbs
32 Cu. ft.


220-240V 50Hz, 17.17A


4 oxidation vessels

220-240V 60Hz, 21.5A

32 (121)


375 lbs

542 lbs
40.3 Cu. ft.


220-240V 50Hz, 21.5A




Product Description

Bath Thermometers


IP 37C Thermometer. For RBOT method.
Range: 144 to 156C


ASTM 96C Thermometer. For ASTM D2112 method.
Range: 120 to 150C


ASTM 100C Thermometer. For TFOUT method.
Range: 145 to 205C

Sample Beakers


RBOT Sample Beaker
Borosilicate glass, 175mL. Meets ASTM D2112, D2272 specifications


TFOUT Sample Container
Borosilicate glass. Meets ASTM D4742 specifications

Oxygen Charging Accessories


Charging Hose
6 ft (1.8m), with connections


Quick Connect Coupling, for charging hose


Quick Connect Couplings, for oxidation pressure vessel


Oxygen Pressure Regulator

Oxidation Pressure Vessel Accessories


Silicone O-ring
Replacement seal for pressure vessel lid-body connection


Sample Beaker Cover (PTFE disk)


TFOUT Sample Beaker Cover (PTFE disk)


Inserts in pressure vessel to hold RBOT beaker and cover in place.


Inserts in pressure vessel to hold TFOUT container and cover in place.

Oxygen Stand Assembly


Oxidation Stand Assembly
For K70400 & K70490

Pressure Vessel Support Rack
Securely holds vessel-recorder assembly in an upright position. Convenient for assembling and disassembling vessel. Equipped with drainage trough for bath oil remaining on the vessel exterior after testing.


Pressure Vessel Support Rack, 2-Unit


Pressure Vessel Support Rack, 3-Unit


Pressure Vessel Support Rack, 4-Unit

Pressure Recorder
Records pressure inside oxidation bomb on 24-hour charts. Range 0 to 200psi, accurate to within 2% of scale range, 24-hour spring wound chart movement. Housed in a finished metal case. Includes cartridge pen. Optional K70502 Oxidata™ Data Acquisition Software Package is available for measuring and recording test data.


Pressure Recorder, 24-hour


Replacement Cartridge Pen


Recorder Chart, 24-hour
Box of 100 charts

Copper Catalyst for RBOT Method


Copper Catalyst Coil
Prepared in accordance with ASTM specifications and packed in a sealed glass container with nitrogen atmosphere. Ready to use.


Copper Catalyst Wire
1.63mm electrolytic copper wire in 500 ft (152m) lengths.


Winding Mandrel
Machined aluminum mandrel for winding copper wire into coils meeting ASTM specifications. Mounts on K70003/K70004 Drive Unit.


Drive Unit for Winding Mandrel
Slow speed gear motor mounted on a sturdy base. Facilitates coil winding procedure. 115V 50/60Hz


Drive Unit for Winding Mandrel
Similar to K70003 but for operation on 220-240V 50/60Hz

Catalyst Package for TFOUT Method


Catalyst Package B
For simulating IIIE engine test. Includes 5 catalyst packages, NIST certified.


Catalyst Package B
For simulating IIIE engine test. Includes 3 catalyst packages.