Automated Mercury Porosimeters - Micromeritics - #5

Penetrometer Characteristics

The penetrometer consists of a sample cup bonded to a metal-clad, precision-bore, glass capillary stem. The sample is placed in the sample cup; during analysis, mercury Ms the cup and capillary stem. As pressure

on the filled penetrometer increases, mercury

intrudes into the sample's pores, beginning with those pores of largest diameter. The mercury moves from the capillary stem

resulting in a capacitance change between the mercury column inside the stem and the metal cladding on the outer surface of the

stem. The AutoPore detects very slight changes in capacitance (equivalent to a dif­ference of less than 0.1 microliter of mercury) so extraordinary resolution is achieved.

The computer will not accept keyboard instructions to overpressurize the system.

The high-pressure system is mechanically unable to generate unsafe pressures.

A circuit stops the generation of pressure

in the event of a failure in the computer. The operating specifications of the

pressure systems (low = 50 psia, high = 60,000 psia) are well below the actual designed safety limits.

Micromeritics also offers a large selection

of penetrometer bulbs, volumes, stems, and closures designed to fit most sample forms, shapes, porosity, and quantity. The better the match between the sample, its porosity, and the measurement range of the sample cell, the more precise the results.

Safety Systems

The AutoPore features several levels of mechanical and electro-mechanical

safety devices:

Percent Paioslly Filled 1.%)