MiniTest - Model FFK - Grease Testers
MINITEST FFK automatically determines the flow-pressure properties of lubricating grease at low temperatures down to -60°C by means of the Kesternich test. The original and time-consuming method is now 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.
- Fully Automatic
- Temperature Adjustable from -60 to +30°C (-76 to + 86°F)
- Thermoelectric Cooling without Cryostat (Peltier Elements)
- Portable and User Friendly
- Powered by Vehicle Battery for Field Use
The original manual and time-consuming method is now fully automated in MINITEST FFK. The measuring range is extended far below the original test method. Temperature control is performed with Peltier elements and eliminates the use of a large and expensive cryostat. No further accessories are necessary.
A layer of the grease to be tested is put on a glass plate without air bubbles. The measuring nozzle is than pressed multiple times onto the layer of lubrication grease until it is filled with grease. The full nozzle is inserted into the thermostatically controlled aluminum block of the tester and the chamber is airsealed.
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 can be set to limit the measuring time.
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 can be set to limit 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, 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.
Flow-properties of lubrication grease at low temperatures 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 -60°C (-76°F).
- Temperature Range
- -60 to +30°C
- -76 to + 86°F
- Temperature Resolution
- +/- 0.1°C
- +/- 0.18°F
- Pressure Range
- 0 to 200 kPa
- 0 to 29 psi
- Pressure Resolution
- +/- 0.1 kPa
- +/- 0.01 psi
- Communication Language : English/German
- Power Requirements : 100/120/230/240 V AC, 50/60 Hz 120 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)
The instrument has a standardized measuring nozzle (1) and a thermostatic block (2). The measuring system is firmly closed with a seal stopper (3). The system is closed at the bottom with an Eppendorf flask (4) to protect the test nozzle against condensation of water. This flask is also collecting the lubrication grease after the test. 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 cascade block (8) with 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 has to be cooled with tap water.
DIN EN 51805
Bestimmung des Fließdruckes von Schmierfetten Verfahren nach Kesternich
Testing of lubricants; determination of flow pressure of lubricating Greases; Kesternich method
Essai des lubrifiants; determination de la pression d’écoulement des graisses lubrifiantes; methóde d’aprés Kesternich