K43041 Foaming Characteristics Apparatus, Sequence IV

Test Method
Foaming of lubricating oils in applications involving turbulence, high speed gearing or high volume pumping can cause inadequate lubrication, cavitation, overflow and premature oxidation. The sample is blown with a controlled volume of air at different specified temperatures, including a newer high temperature test at 150°C. The resultant foam is measured at the end of each aeration period and at different intervals afterward. In the high temperature test, the amount of time required for the foam to collapse to “0” after the aeration period is also measured.

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

High Temperature ‘Sequence IV’ Liquid Foam Test Bath
For two tests at 150°C with a flow rate of 200mL/min. in accordance with ASTM D6082 specifications. Consists of a constant temperature bath with 1000mL test cylinders, certified diffusers, air delivery tubes and flowmeters. Microprocessor PID control provides quick temperature stabilization without overshoot and the bath is protected by an overtemperature control circuit that interrupts power should bath temperature exceed a programmed cut-off point. Dual LED displays provide actual and setpoint temperature values in °C/°F format. Quick response copper immersion heaters provide efficient high temperature operation, and a stirrer unit provides complete circulation for temperature uniformity of better than ±1°F (±0.5°C). Locking cams hold the test cylinders in a vertical position, and a separate rack is provided to hold the cylinders after removal from the bath. For operator safety, an acrylic heat shield surrounds the Borosilicate Glass bath jar. Communications software (RS232, etc.), ramp-to-set and other enhanced features are available as extra cost options. Contact your Koehler representative for information.

Conforms to the specifications of: ASTM D6082
Temperature Control:
Digital Setpoint and Displays °C/°F switchable
Built-in Overtemperature Cut-off Protection

Included Accessories
Test Cylinders, 1000mL (2)

Diffuser Stones, calibrated and certified (2)
Air Delivery Tube Assemblies (2)
Air Outlet Tube (2)
Bath Jar (1)
Support Rack (1)
Rubber Stoppers (2)
Acrylic Safety Shield, 18”

Ordering Information
Model Catalog
Air Flow Rate Bath Capacity Dimensions
lxwxh, in. (cm)
Shipping Information
Sequence IV Liquid K43041 115V


(Operator variable)

200mL/min 9 gal (38.5L) 16.75x15x31.25 (42.5x38x79.4)
Net Weight: 62 lbs (28.1kg)
Shipping Weight: 89 lbs (40.4kg)
Dimensions: 16.3 Cu. ft.
K43049 220-240V

Catalog Number
Product Description
Air Pump, oil-less.
Delivers 100% oil-free air. 115V, 50/60Hz
Air Pump, oil-less.
Delivers 100% oil-free air. 220-240V, 50/60Hz
Wet Test Gas Meter
For volume measurements of air leaving the test cylinders. Note: One meter is required for each test cylinder. Not required for the ‘Alternative Procedure’ - Section 9.1
332-005-005 Drying Tower. 300mm
K43025 Diffuser Stone Test Apparatus
For maximum pore diameter and permeability tests on diffuser stones. Consists of 90cm manometer, 500mL flask, flowmeter, graduate, delivery tube assembly and control valve.
K33031 Refrigerated Recirculator, 115V 60Hz, 8A
Use with foam test baths for 24°C tests (Sequence I and III). Microprocessor based digital control and quiet running compressor provide reliable operation and accurate control within ±0.5C.
K33032  Refrigerated Recirculator, 220-240V 50Hz, 4A
250-000-12F ASTM 12F Thermometer.
Range: –5 to +215°F
250-000-12C ASTM 12C Thermometer.
Range: –20 to +102°C
250-000-41C  ASTM 41C Thermometer.
Range: 98 to 152°C
K23425 Acrylic Heat Shield, with base
For high temperature bath on Dual-Twin Foam Test Apparatus.
344-100-01C  Certified Diffuser Stone.
Calibrated and certified for compliance with ASTM specifications for pore diameter and permeability.
344-100-001 Diffuser Stone, non-calibrated
344-005-001 Stainless Steel ‘Mott’ Diffuser
K43012 Test Cylinder
Replacement 1000mL cylinder. Includes retaining ring.
When inquiring about NIST traceable certified thermometers, please refer to the catalog number for the corresponding thermometer and replace the middle three zeros in the catalog number with 004. Example: 251-000-01C ASTM 1C Thermometer would be 251-004-01C ASTM 1C Certified Thermometer.