• Demulsibility Bath

Demulsibility Bath


Tests the ability of medium to high viscosity oils to separate from water when water contamination and turbulence are encountered. The sample is stirred together with distilled water for 5 min. at constant temperature. After a specified settling period, the degree of separation is measured by volume and the percentage of water in oil is determined. For lighter oils and synthetic fluids, the ASTM D1401 Water Separability Test is used.

  • Conforms to the specifications of ASTM D2711
  • Variable stirrer speed
  • Choice of digital or analog bath models

Constant Temperature Baths – Standard model holds two K39103 Stirrers and two K39120 Separatory Funnels in proper alignment for demulsibility characteristics testing. Stirrers mount securely on a stainless steel support plate having brackets for testing and drainage positions. Separate motor speed controls are provided for each stirrer. All wetted parts are constructed of stainless steel. It includes a microprocessor digital temperature control with dual LED displays for setpoint and actual temperatures and an illuminated bath interior with window for viewing sample cylinders. Digital LED speed control is provided for each stirrer. 


Stirrer – Complete stirrer assembly per Fig. 1 and 2 of ASTM D2711, including variable high speed drive motor, stainless steel propeller shaft, top, center and bottom bearings, and steel motor housing with positioning plate. Entire assembly mounts vertically in K39190/K39199 Constant Temperature Bath. Built-in tachometer disc allows for precise stirrer speed adjustment.

Conforms to the specifications of: ASTM D2711

Capacity: Two (2) sample-water mixtures

Maximum Temperature: 212°F (100°C)

Temperature Control: Microprocessor digital control with LED display

Bath Medium: 9 gal (38.5L) water

115V 6 0Hz
220-240V 50/60 Hz

WxDxH in (cm): 15 1⁄4x15x37(39x38x94) 
Net Weight: 72 lbs (32.6kg)

Shipping Weight: 133 lbs (60.3 kg)

Dimensions: 30x27x45 in. (76.2x68.6x114.3 cm)

  • K39103 Stirrer
  • K39120 Separatory Funnel With 0-500mL graduations. Meets ASTM specifications.
  • K39130 Solvent Tank. Immerses stirrer assembly for convenient cleaning after testing.
  • K39140 Forced Warm Air Dryer, 115V 60Hz - High output 1400W dryer and brass cylinder mounted on a sturdy base. Rapidly dries stirrer assembly after cleaning.
  • K39149 Forced Warm Air Dryer, 220-240V 50/60Hz 
  • K39150 Sampling Gauge and Centering Device Per Fig. X1.1 of ASTM D2711. Aids in accurately obtaining 50mL samples from separatory funnels for the ‘percent water in oil’ determination.
  • 360-000-003 Digital Tachometer - Hand held non-contact LCD tachometer takes measurements up to 3 ft away with ±1rpm accuracy. Supplied with four 1.5V AA batteries.
  • 250-000-09F ASTM 9F Thermometer - Range: 20 to 230°F
  • 250-000-09C ASTM 9C Thermometer - Range: –5 to +110°C
  • K39170 Conditioning Bath, 115V 60Hz - Constant temperature water bath holds 8 separatory funnels in two removable 4-unit racks for conditioning prior to testing in Demulsibility Apparatus. Includes microprocessor digital temperature control, automatic water level control and gabled cover.
  • K39179 Conditioning Bath, 220-240V 50/60Hz