The RPVOT (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. PRESSURE VESSELS REQUIRED AT ADDITIONAL COST.
~ Conforming to ASTM requirements for RBOT and TFOUT testing
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. Tester 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. Over-temperature 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.
Specifications: Conforms to the specifications of: ASTM D2112, D2272, D4742; IP 229
Capacity: 2, 3 or 4 oxidation pressure vessels (Priced as a 3-place unit. PLEASE REQUEST PRICE ON 2 OR 4 POSITION BATH)
Maximum Temperature: 200°C (392°F)
Control Stability: ±0.02°C (±0.04°F)
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)
REQUIRES PRESSURE MEASUREMENT SYSTEM - See stock #N885A or N885B for software or chart recorder options.
The following link provides additional information from the instruction manual or manufacturer's brochure. Click to open the PDF in a new window or right-click to download it: Koehler K70503 / K70593 XP RPVOT Oxidation Stability Tester
or copy the following into your browser address window: labequip.com/stock/pictures/n885.pdf
Made in USA.
This item ships from Bohemia, NY.