K29400 Evaporation Loss Test Apparatus


Test Method
Evaluates the potential for evaporation loss of lubricant components in high temperature service. A controlled flow of heated air is passed over the sample for a specified period. Evaporation loss is measured by the change in sample weight during the test. The Evaporation Loss test can also be used for Estimating Apparent Vapor Pressures and Molecular Weights of Lubricating Oils (ASTM D2878). A high temperature version of the Evaporation Loss test is available (See ASTM D2595).

Features and Benefits
• Conforms to ASTM D972, D2878 and related specifications

• Two-sample testing capability


K29400 Evaporation Loss Test Apparatus
Evaporation Cell Suitable for evaporation loss tests on lubricating greases and oils in the temperature range of 210 to 300F (99 to 149C). Passes heated air over the sample at the required flow rate. Consists of stainless steel body, cover, eduction tube and hood. Calibrated flowmeter with needle valve maintains 2L/min. air flow at standard temperature and pressure. Supplied with stainless steel grease or oil sample cup. Sample cups are interchangeable. Entire assembly mounts in Evaporation Loss Test Bath.

Evaporation Loss Test Bath — Constant temperature oil bath mounts two Evaporation Cells in an upright position at the proper immersion level. Maintains test temperature within 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. Communications software (RS232, etc.), ramp-to-set and other enhanced features are available as extra cost options. Contact your Koehler representative for information. Fully insulated, double-wall construction, with stainless steel tank and polyurethane-finished steel exterior.

*Also available–special bath to accommodate both ASTM D972 and D942 (Oxidation Stability of Greases K10901) test methods. Please contact Koehler for additional information.

Conforms to: ASTM D972, D2878; IP 183; FTM 791-351

Capacity: 2 oil or grease samples

Maximum Temperature: 350F (177C)

Temperature Control Stability: 1F ( 0.5C)

Circulation: 1/20hp stainless steel impeller

Bath Medium: 5.3 gal (20L) high temperature transfer fluid

Included Accessories
Evaporation Cell:
Grease Sample Cup (K29500) or Oil Sample Cup (K29550)
Test Bath:
Support Clamps (2)
Thermometer Holder

Electrical Requirements
115V 50/60Hz, Single Phase, 8.6A
220-240V 50/60Hz, Single Phase, 4.5A

33" (maximum width with two evaporation cells inserted) x 25.5"h (84x65cm)
Net Weight: 62 lbs (28.1kg)

Shipping Information
Shipping Weight: 90 lbs (40.8kg)
Dimensions: 14.2 Cu. ft.

Ordering Information



Product Description

Electrical Requirements

Evaporation Test Cell


Evaporation Test Cell with Grease Cup



Evaporation Test Cell with Oil Cup


Evaporation Loss Test Bath


Evaporation Loss Test Bath

115V 50/60Hz


Evaporation Loss Test Bath

220-240V 50/60Hz



Catalog Number

Product Description


ASTM 22F Thermometer
Range: 204 to 218F


ASTM 22C Thermometer
Range: 95 to 103C


ASTM 67F Thermometer
Range: 203 to 311F


ASTM 67C Thermometer
Range: 95 to 155C


Temperature Limit Control, 115V 50/60Hz
Provides overtemperature protection for constant temperature baths.


Temperature Limit Control, 220-240V 50/60Hz


Oil Sample Cup with Hood


Grease Sample Cup with Hood


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.