MINITEST FFK Grease Tester

Flow-Properties of Lubrication Grease according to Kesternich (DIN 51805)


MINITEST FFK automatically determines the flow-pressure properties of lubricating grease at low temperatures down to -50°C by means of the Kesternich test. The original and time-consuming method is fully automated and the measuring range is extended far below the original one, resulting in a considerably improved test precision.

A powerful two stage Peltier element avoids the use of a large and expensive cryostat. The principle of the test is based upon the necessary pressure build-up to press an amount of grease through a standard test nozzle at a preset temperature.

ADVANCED TECHNOLOGY
The original manual and time-consuming method is fully automated in MINITEST FFK. The measuring range is extended far below the original test method.
Temperature control is performed with Peltier elements which eliminate the use of a large and expensive cryostat. No further accessories are necessary.

SAMPLE HANDLING
A layer of the grease to be tested is put on a glass plate without air bubbles. The measuring nozzle is simple pressed a few times onto the layer of lubrication grease until it is filled with grease. The nozzle is then inserted into the thermostatically controlled metal block of the tester and the chamber is airsealed.

TEST-PARAMETERS
The test temperature and the equilibrium time are programmed. Further the expected flow pressure and the pressure increase for each step. For high flow pressures, a starting pressure above barometric pressure can be set to accelerate the measuring time.

MEASURING PROCEDURE
The test temperature, equilibrium time, expected flow pressure and the pressure increase for each step are programmed. For high flow pressures, a starting pressure above barometric pressure can be set to accelerate the measuring time. The test is performed fully automatically. When the test temperature is reached, the equilibrium time of up to two hours is started. After the equilibrium time, the pressure above the sample nozzle is increased in steps until a sudden pressure decrease is observed, indicating that the grease is pressed through the nozzle. The test is stopped and the last pressure value is displayed as the flow pressure according to Kesternich.

APPLICATIONS
Flow-properties of lubrication grease at low temperature are a measure of great significance for central lubrication systems of vehicles and machineries. This property can best be measured according the method of Kesternich.

This test method is suitable for temperatures at which no grease leaks out of the test nozzle.

MINITEST FFK is an instrument for the determination of the flow pressure of lubricating greases at temperatures down to -50°C (- 58°F).

  • Specifications +


    Flow-Properties of Lubrication Grease according to Kesternich (DIN 51805)


    Features

    • Fully Automatic
    • Temperature Adjustable from -50 to +30°C (-58 to + 86°F)
    • Thermoelectric Cooling without Cryostat (Peltier Elements)
    • Portable and User Friendly
    • Powered by Vehicle Battery for Field Use



    Technical Data

    Temperature Range
    -50 to +30°C
    -58 to + 86°F
    Temperature Resolution
    +/- 0.1°C
    +/- 0.18°F
    Pressure Range
    0 to 300 kPa
    0 to 43.5 psi
    Pressure Resolution
    +/- 0.1 kPa
    +/- 0.01 psi
    Communication Language
    English/German
    Power Requirements
    100/120/230/240 V AC, 50/60 Hz 200 W
    Optional: 12 V / 10 A DC (vehicle battery)
    W x H x D
    196 x 315 x 175 mm (7.7" x 12.4" x 6.9")
    Weight
    10 kg (22 lb)

    Accessories
    Printer and Mini-Keyboard recommended

    Principle
    The instrument has a standardized measuring nozzle (1) and a thermostatic block (2). The measuring system is firmly closed with a seal stopper (3). At the bottom there is an Eppendorf flask receiving the grease after the test and (4) to avoid condensation of water inside. The test pressure is generated by a motor-driven piston (6) and measured with a precision pressure transducer (5). The required low temperature is regulated by a cascaded block (8) of Peltier elements (7). Down to temperatures of -30°C (-22°F) the heat is dissipated over a heat exchanger (9). For lower temperatures the heat exchanger can be cooled with tap water.

    Continuous product development may make it necessary to change product specifications without notice.
  • Downloads +

  • Standards +


    DIN 51805
    Testing of lubricants; determination of flow pressure of lubricating greases, Kesternich method