Humboldt H-1200 Product Manual Download Page 3

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Procedure

Add the required weights to plunger head. In adding weights and in order to make
up the required load for the test, note that the weight of the test plunger itself is 47.5
grams. For example, when the speciﬁed load for grease penetrations involving the use
of a grease cone is 150 grams, no weights need be added to the plunger head since
the combined weight of the cone (102.5 grams) and test plunger (47.5 grams) makes up
required load as speciﬁed by ASTM. Place a prepared sample in position on base.
Adjust the height of the mechanism head via the control sleeve on the main post so as
to bring the point of the penetrating instrument exactly into contact with the surface of
the sample. To adjust the height of the mechanism head, release the lock screw. This
adjustment may be accomplished more easily by placing a weak light to one side of the
sample container and observing the shadow formed by the penetrating instrument on
the surface of sample, until light disappears from the point. BE SURE TO RELOCK THE
HEAD SECURELY BY MEANS OF THE LOCK SCREW AFTER THE HEIGHT ADJUSTMENT
IS COMPLETED.

Release the test plunger, allowing the penetrating instrument to descend into

the sample. To release the test plunger, depress and hold the clutch trigger

in its released position during the speciﬁed time required for the test. Use a

stopwatch to verify release duration.

CAUTION:

In operating the clutch trigger, grasp the finger grip firmly with the

forefinger, and with the thumb depress the clutch trigger quickly as far in as it

will go. HOLD THE CLUTCH TRIGGER IN DURING THE SPECIFIED LENGTH OF

THE TEST. At the specified duration, let go of the clutch trigger quickly, allowing

it to lock the test plunger instantly.

Reading Penetration

To read the depth of penetration, push down the gear rack knob gently as far as it will go.
The dial reading now indicates the depth of penetration directly in tenths of millimeters.
For example: If the pointer comes to a rest at the fourth mark past the 270 point, the
depth of penetration is 274 tenths of a millimeter or 27.4 millimeters.
With the Universal Penetrometer, penetration measurements can be made to a total
depth of 40 mm on a single reading. On depths greater than 40 mm the dial pointer
makes a complete revolution and moves past the zero position for a fraction of another
revolution. Simply add the fractional revolution to determine the total depth of
penetration.
Return the dial pointer to zero, as directed in the Installation paragraph. If the original
zero setting has been accurate, the dial pointer will return exactly to zero and subsequent
readings will check against standard gauge blocks.
We also supply a 15-gram test plunger – readily installed or removed

CAUTION:

Keep hands, clothing and other objects away from moving parts when the

machine is in operation.