Patent ID: 11874155
Assignee: MICROMERITICS INSTRUMENT CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for calibrating a pycnometric device, comprising:
(a) selecting a custom volume reference standard having a known volume selected to substantially match a volume of at least one sample to be measured by the pycnometric device, wherein the custom volume reference standard is formed with a high aspect ratio reference shape and comprises a material having a low coefficient of thermal expansion (CTE), and including at least one of a lithium-aluminosilicate glass-ceramic, sapphire, silicon, fused silica, or combinations thereof;
(b) placing the custom volume reference standard into a sample chamber of the pycnometric device;
(c) determining a measured volume of the custom volume reference standard based on a difference in pressure of a gas introduced into the pycnometric device and a known volume of the sample chamber;
(d) comparing the measured volume of the custom volume reference standard to the known volume of the custom volume reference standard; and
(e) adjusting an average calibration volume for the sample chamber based on the comparison of the measured volume of the custom volume reference standard to the known volume of the custom volume reference standard.