Precision TM Instruction Manual
These instructions encompass the model listed below.
The Precision Universal Penetrometer is used to determine the consistency of semi-solid, solid materials. Since the
universal model accepts all needles and cones, the flexibility is complete. In addition to petroleum tests, this unit has
many applications in other industries.
This apparatus can also be used in the baking industry and other related fields. Cakes and breads have been tested with
this apparatus by measuring the penetration, to determine their degree of softness. Binding powers of dried milk have
also been found for the Penetrometer with materials other than petroleum products. While there may be no specific test
or method, various manufacturers have established arbitrary standards, selecting one of the many cones offered. By
maintaining set sample size, temperature, penetrating weight and time, a very workable test procedure may be
This penetrometer conforms to the following ASTM and ASA specifications: ASTM D-5, D-217, D-937, ASA Method
214.01 of Federal Test Specification SS-R-406C, and ASTM 211.3 of ASA Method of Federal Test Method 791, IP: 49,
50, 179; DIN: 51804, 51580.
ASTM Methods can be obtained from:
American Society for Testing Materials
1916 Race Street
Philadelphia, Pennsylvania 19103
Add the necessary weights to the plunger rod. In adding the weights to the plunger rod to make up the required load for
the test, note that the weight of the standard test rod supplied is 47.5 grams. When the specified load for grease
penetrations involving the use of a grease cone is 150 grams, no weights need to be added to the plunger rod if cone no.
73526 is used.
Be sure to use the two leveling screws and bubble level to level penetrometer before each
The combined weight of the cone (102.5 grams) and the test rod (47.5 grams) makes up the required load as specified by
ASTM. Place the prepared sample in position on the base. Adjust the height of the mechanism head so that the point
of the penetrating instrument is brought exactly into contact with the surface of the sample. This adjustment may be
accomplished more easily by placing a weak light to one side of the sample container and following the shadow formed
by the cone's tip on the surface of the sample until no light appears from its point.
To adjust the height of the mechanism head, release the lock screw. Make a coarse adjustment by means of the coarse
adjusting screw (knob directly opposite the lock screw on the mechanism head).
Be sure to securely lock the head by means of the lock screw.
Make the final "contact" adjustment by means of the vertical micro-adjustable screw. Release the test rod, allowing the
penetrating instrument to descend into the sample. To release the test rod, depress the thumb release lever. Hold it in
its released position during the specified time required for the test.