Measuring and testing – Particle size
Patent
1988-02-19
1990-05-01
Chapman, John
Measuring and testing
Particle size
G01N 1508
Patent
active
049208101
ABSTRACT:
An automated device for warming and cooling a sample is disclosed, and is particularly useful in connection with a flowing gas surface area analyzer. The device is capable of directing a flow of room temperature air onto a sample chamber after the chamber is removed from a coolant, thus rapidly warming the sample up to, but not exceeding, room temperature. In the disclosed embodiment, a Dewar flask containing coolant is mounted on an elevator platform. The flask is mechanically raised or lowered so as to immerse the sample chamber, located above the flask, in the coolant. A fan directs a flow of air onto the sample after the flask is lowered away from the sample chamber. A logic controller, connected to a timer, operates and regulates the cooling and warming process. The elevator assembly, fan and controller are disposed within a housing. The sample chamber is connected to gas input and output tubes, which are monitored by a detector for the composition of gas passing through the tubes. A method is also disclosed for analyzing the surface area of a sample using the device.
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Camp Ronnie W.
Orr, Jr. Cyde
Chapman John
Micromeritics Instrument Corporation
Roskos Joseph W.
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