Test Method

ASTM D1401
Test Method for Water Separability/Demulsibility of Petroleum Oils and Synthetic Fluids

This test is crucial for critical equipment that may be at risk for water Demulsibility in
lubricating oils can be defined as the ability of a lubricating oil to release the water of a
lubricant to separate from water will result in fluid degradation, corrosion of components,
and potential failure due to improper lubrication.

Key Features

• Bath temperature display in 0.1’C resolution.
• Temperature calibrations can be performed in the calibration screen
• Sample stirrer speed in rpm with 1 rpm resolution
• 7 on screen timers are provided for monitoring status of each sample.
• These times may be adjusted in setup screen.
• Stirring time remaining for the test.
• Audible alarm on the end of the test.
• 7 elapsed times for observance of separation.

Test Apparatus for Determining Water Separability of Petroleum Oils and Synthetic Fluids.
Precision sample stirrer motor for 1500 +/- 1 rpm adjustable up-to 2500 rpm.
This motor is unaffected by voltage fluctuations since power to motor is conditioned.
Scratch proof high visibility shield affords protection and prevents temperature upsets
Integrated micro-processor based controller and color touch panel
Intuitive “Windows Based color touch panel” screens display following:

Sample stirrer motor’s horizontal position is fixed while vertical elevating motion is allowed. This allows
repeatable concentric positioning with sample tubes, which is critical. Special turntable with lock pin
mechanism enhances concentricity. Minimized length of motor shaft prevents run out.
The buffed and polished paddle is machined from a single piece of stainless stock and not welded. This
eliminates contamination in crevices and thereby eliminates erroneous results
The unit is protected from low liquid level safety float switch. Also provided is a high temperature limit to
prevent unit from achieving temperatures higher than desired.
The unit is electrically protected by a circuit breaker.
The unit is provided with 7pcs of WS-1401-D disposable graduated test tubes.