K43002 Foaming Characteristics Apparatus


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 150C. 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.

Features and Benefits

• Dual-twin models for standard foaming characteristics tests

• High temperature liquid baths for ‘Sequence IV’ tests

• Automatic time sequence models for both tests

• Custom configurations for specialized applications


K43002 Foaming Characteristics Apparatus
Performs two tests at 75F (24C) and two tests at 200F (93.5C). Consists of two 12x18" (30.5x45.7cm) constant temperature baths with 1000mL test cylinders, certified diffusers, air delivery tubes, and flowmeters (94mL/min.) for each sample. Baths are equipped with microprocessor temperature controls, copper immersion heaters and 1/20hp circulation stirrers to maintain temperature uniformity of 1F (0.5C). 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. Test cylinders are held securely in place by quick-locking cams in the bath cover assembly. A separate stainless steel support rack is provided to hold the test cylinders after removal from the bath. Cold bath (24C) has built-in coils for circulating exit air from the high temperature test cylinders prior to passing to a volume meter, and a separate coil for circulating cooling water or refrigerant when the ambient temperature exceeds the test temperature. Supplied with rubber stoppers and glass air outlet tubes for each cylinder. Bath controls are enclosed in a finished steel base with chemical resistant polyurethane enamel finish. Communications software (RS232, etc.), ramp-to-set and other enhanced features are available as extra cost options. Contact your Koehler representative for information.

FTM 791-3213 Aircraft Lubricants Test
Employs more severe conditions – smaller sample, increased air flow, longer aeration period – to test the foaming characteristics of aircraft-turbine lubricants. All models are available on special order for FTM 791-3213 testing. Please contact us for specifications and ordering information.

Custom Configurations
In addition to the standard configurations described, Koehler liquid-bath foaming characteristics test equipment can be ordered in the following custom configurations:
• Dual-Twin 24C/D892-150C/D6082
• Dual-Twin 93.5C/D892-150C/D6082
• Single-Bath model for ASTM D892 (for 24C and 93.5C tests)
Custom models have the same operating features and characteristics as the standard models and each bath is equipped with the necessary air flow and control accessories required to perform the applicable test method. Contact your Koehler representative for ordering information and pricing.

Included Accessories
Test Cylinders, 1000mL
Diffuser Stones, calibrated and certified
Air Delivery Tube Assemblies
Air Outlet Tubes
Rubber Stoppers
Bath Jars
Support Rack

Conforms to the specifications of:
ASTM D892; IP 146; DIN 51566; FTM 791-3211, 791-3213*; NF T 60-129
*Requires modifications to standard equipment.

Air Flow Rate: 94mL/min

Bath Temperature: 24C (75F) and 93.5C (200F) - Operator Variable

Bath Capacity: 9 gal (38.5L) each bath

Temperature Control:
Digital Setpoint and Displays C/F switchable
Built-in Overtemperature Cut-off Protection

Electrical Requirements
115V, 50/60Hz, 16A
220-240V, 50/60Hz, 8A

Dimensions lxwxh,in.(cm)
32.25x15x31.25 (82x38x79.4)
Net Weight:
K43002: 108 lbs (49kg)
K43003: 118 lbs (53.5kg)

Shipping Information
Shipping Weight:
K43002: 217 lbs (98.4kg)
K43003: 227 lbs (103kg)
K43002: 29.6 Cu. ft.
K43003: 33 Cu. ft.

Ordering Information



Product Description

Electrical Requirements


Foaming Characteristics Apparatus, Dual-Twin

115V 50/60Hz


Foaming Characteristics Apparatus, Dual-Twin

220-240V 50/60Hz


Foaming Characteristics Apparatus, Automatic Time Sequence

115V 50/60Hz


Foaming Characteristics Apparatus, Automatic Time Sequence

220-240V 50/60Hz



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


Drying Tower. 300mm


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.


Refrigerated Recirculator, 115V 60Hz, 8A
Use with foam test baths for 24C tests (Sequence I and III). Microprocessor based digital control and quiet running compressor provide reliable operation and accurate control within 0.5C.


Refrigerated Recirculator, 220-240V 50Hz, 4A


ASTM 12F Thermometer.
Range: –5 to +215F


ASTM 12C Thermometer.
Range: –20 to +102C


ASTM 41C Thermometer.
Range: 98 to 152C


Acrylic Heat Shield, with base
For high temperature bath on Dual-Twin Foam Test Apparatus.


Certified Diffuser Stone.
Calibrated and certified for compliance with ASTM specifications for pore diameter and permeability.


Diffuser Stone, non-calibrated


Stainless Steel ‘Mott’ Diffuser


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.