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

Click on the image to view a larger photo of the instrument.

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 16.7°C (30°F) above the temperature setting or 177°C (350°F). 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: 200°C (392°F)

Control Stability: ±0.02°C (±0.04°F)

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 or 355-001-004)

Ordering Information
Capacity Electrical Requirements Bath Capacity
gal (L)
Net Weight Shipping Weight, Dimensions
K70200 2 oxidation vessels 220-240V 60Hz, 17.17A
18 (68)
237 lbs
356 lbs
25.3 Cu. ft.
K70290 220-240V 50Hz, 17.17A
K70300 3 oxidation vessels 220-240V 60Hz, 17.17A
25 (95)
284 lbs
416 lbs
32 Cu. ft.
K70390 220-240V 50Hz, 17.17A
K70400 4 oxidation vessels 220-240V 60Hz, 21.5A
32 (121)
375 lbs
542 lbs
40.3 Cu. ft.
K70490 220-240V 50Hz, 21.5A

Product Description
Bath Thermometers
250-001-37C IP 37C Thermometer. For RPVOT (RBOT) method.
Range: 144 to 156°C
250-000-96C ASTM 96C Thermometer. For ASTM D2112 method.
Range: 120 to 150°C
250-000-100C ASTM 100C Thermometer. For TFOUT method.
Range: 145 to 205°C
Sample Beakers
K70040 RBOT Sample Beaker
Borosilicate glass, 175mL. Meets ASTM D2112, D2272 specifications
K70091 TFOUT Sample Container
Borosilicate glass. Meets ASTM D4742 specifications
Oxygen Charging Accessories
K70080 Charging Hose
6 ft (1.8m), with connections
K70081 Quick Connect Coupling, for charging hose
K70083 Quick Connect Couplings, for oxidation pressure vessel
K70013 Oxygen Pressure Regulator
Oxidation Pressure Vessel Accessories
K70050 Silicone O-ring
Replacement seal for pressure vessel lid-body connection
K70049 Sample Beaker Cover (PTFE disk)
K70048 TFOUT Sample Beaker Cover (PTFE disk)
K70000-03008 Spring
Inserts in pressure vessel to hold RPVOT (RBOT) beaker and cover in place.
K700-0-3A Spring
Inserts in pressure vessel to hold TFOUT container and cover in place.
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.
K70017 Pressure Vessel Support Rack, 2-Unit
K70011 Pressure Vessel Support Rack, 3-Unit
K70012 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.
K70010/24 Pressure Recorder, 24-hour
K70018 Replacement Cartridge Pen
308-000-004 Recorder Chart, 24-hour
Box of 60 charts
Copper Catalyst for RBOT Method
K70030 Copper Catalyst Coil
Prepared in accordance with ASTM specifications and packed in a sealed glass container with nitrogen atmosphere. Ready to use.
K70090 Copper Catalyst Wire
1.63mm electrolytic copper wire in 500 ft (152m) lengths.
K70002 Winding Mandrel
Machined aluminum mandrel for winding copper wire into coils meeting ASTM specifications. Mounts on K70003/K70004 Drive Unit.
K70003 Drive Unit for Winding Mandrel
Slow speed gear motor mounted on a sturdy base. Facilitates coil winding procedure. 115V 50/60Hz
K70004 Drive Unit for Winding Mandrel
Similar to K70003 but for operation on 220-240V
Catalyst Package for TFOUT Method
K70094 Catalyst Package B
For simulating IIIE engine test. Includes 5 catalyst packages, NIST certified.
K70095 Catalyst Package B
For simulating IIIE engine test. Includes 3 catalyst packages.
Oxygen Stand Assembly
K70401 Oxidation Stand Assembly
For K70400 & K70490