Model 305 is a robust 7 position apparatus that meets the full requirements of ASTM D1401 and related Water Separability (demulsability) methods by testing an emulsion formed by stirring water and a lubricating oil sample. The glass jar heating bath has a range of 40° to 95°C and a stability of ±0.1°C. The temperature is digitally displayed with a resolution of 0.1°C.



A color touch panel, which is friendlier than single line displays, is used to display temperature and RPM plus control the unit. Plus it also has built in timers for each position to avoid the need for stopwatches. When agitation is stopped an audible alarm is sounded to alert the user.



The adjustable speed stirrer operates at 1500 rpm ±1 rpm and is a precision motor unaffected by fluctuations in AC line voltage that would change the speed of AC motors in competitive units. The stirrer speed RPM is measured by a tachometer and digitally displayed.



The stirrer motor is securely fixed with only a vertical range of motion without the use of belts or chains. The Lawler design permits lifting for paddle and sample removal. Time is saved in alignment for the next test and future mechanical problems are avoided by keeping the motor fixed and use of a sample turntable that locks in place at each position.



The stirrer paddle and shaft is machined from a single piece of stainless steel. This paddle reduces the possible micro crevices which may accumulate contamination. These contaminants are difficult to remove in paddles of conventional soldered shaft and paddle construction.



The enclosed cabinet design gives the unit a stable footprint less prone to topple over and safer in high temperature applications than open jar designs. The bath jar is easily removable from the rear. Additional safeguards include low level, over temperature, and circuit breaker protection. The bath cover reduces water loss and has the capacity for 7 graduated test cylinders. The unit is backlit for easier reading of the emulsion separation line.



The approximate overall dimensions are 15 x 18 x 30 inches high (38 x 46 x 77 cm).