K19404, K19494 Dropping Point Apparatus
Operation and Instruction Manual
K19404, K19494-Manual -12-
1. Suspend the fully prepared and assembled test
tube apparatus in the oil bath through the tube
and thermometer support (Figure 1, Item 9)
with metal guide.
NOTE: The test tube rim should be at
least 6mm above the oil level. Adjust oil level if
necessary.
2. Suspend the bath thermometer into the oil bath
through the tube and thermometer support
without the metal guide. The bulb must be at
approximately the same level as the bulb of the
test tube thermometer.
3. Power on the unit by pressing the power switch
(Figure 2, Item 1) to the ON position.
NOTE: The button has a indicator light
built in and will illuminate green when the unit is
powered on.
4. Turn on the stirrer motor by pressing the Stirrer
Motor Switch (Figure 2, Item 2).
NOTE: The button has a indicator light
built in and will illuminate green when the stirrer
motor is powered on.
WARNING: Be sure the stirrer motor is
not in contact with the bath thermometer, test
tube or beaker prior to turning on the stirrer
motor.
5. Turn the Temperature Control Dial (Figure 2,
Item 3) Clockwise to begin heating the sample.
6. Heat the bath at a rate of 4 to 7°C / min until
the bath reaches a temperature of
approximately 17°C below the expected
dropping point of the grease.
7. At this point reduce the rate of heating so that
the temperature difference between the test
tube and the oil bath is maintained between 1
and 2°C.
NOTE: This condition is established
when the oil bath is heated at a rate of about 1
to 1.5°C.
8. As the temperature increases, material will
gradually protrude through the orifice of the
grease cup. When a drop of material falls, note
the temperatures on the two thermometers and
record their average to the nearest degree as
the dropping point of grease.
9. After the dropping point occurs, turn the
Temperature Control Dial counterclockwise to
the off position. Press the stirrer motor switch
to the off position. Press the Power Switch to
the off position. Unplug the stirrer motor line
cord from the back of the unit.
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