Seal the Penetrometer
To avoid transferring skin oils, it is recommended to wear latex gloves when handling penetrometers. Skin oils may affect results. |
It is important that penetrometers are clean and dry. See Clean the Penetrometer.
-
A vacuum-tight seal is required. Therefore, vacuum grease (Apiezon H) must be used to fill the inevitable roughness of the ground glass lip and polished surface of the cap. To apply grease:
Follow these instructions carefully. Too much grease exposes the sample to an unwanted coating and is likely to cause slippage and misalignment of the mating surfaces. Too little grease results in an imperfect seal. -
Use a fingertip to apply a light coating of grease to the lip of the bulb.
-
Smooth the grease evenly around the lip of the bulb.
- Remove all excess grease from both the inside and outside of the bulb.
-
- Hold the penetrometer upright. Place a cap over the greased bulb and turn the cap one half turn to seat.
-
Place the penetrometer tool over the nut.
-
Place the wrench peg into a hole in the penetrometer nut. Use the penetrometer tool to stabilize the cap while tightening the nut counter-clockwise.
-
Weigh the penetrometer before installing it in the low pressure port. See Weigh the Assembled Penetrometer with Sample.
Copyright © 2014 - 2017. Micromeritics Instrument Corporation. All rights reserved.