Micromeritics ASAP 2460, Руководство оператора

Страница: 17 / 468

ASAP 2460 Operator’s Manual Gas Requirements
246-42800-01 - Aug 2013 1-5
The ASAP analysis program supports four analysis modes:
• Standard
• Krypton
• High Throughput
• Micropore

In
Standard
mode, the system performs nitrogen, or similar gas, analyses at 77 K. All analyses must
use the same gas. Samples can be removed and added to any of the ports without disturbing the analy-
ses being performed on other ports.
In
Krypton
mode, the analyses are started together. Port 2, 4, or 6 (depending on system configura-
tion) is used to store Krypton for dosing. The data collection is done sequentially — one analysis starts
and completes before the next is started.
In
High Throughput
mode, up to six nitrogen, or similar gas, analyses are started together. All analy-
ses must use the same analysis gas and the same Psat gas, which may be different from the analysis
gas. Once a set is started, no other samples can be started until the set is complete. The data collection
is done in parallel. This mode also supports measured freespace.
In
Micropore
mode, up to six analyses are started together. Once a set is started, no other samples can
be started until the set is complete.
Each analysis port is equipped with an elevator that raises and lowers the analysis bath fluid dewar
automatically. A removable shield to enclose the dewar is also included for safety purposes.
The sample saturation pressure (Psat) tube is located next to the sample analysis port. Gas inlet ports
and cable connections are located on the side panel of the analyzer for easy access.
The system includes Isothermal Jackets, which were originally patented by Micromeritics, for the sam-
ple tube. The Isothermal Jacket maintains a stable thermal profile along the full length of the sample
and Psat tubes.
Gas Requirements
Compressed gases are required for analyses performed by the instrument. Gas bottles or an outlet from
a central source should be located near the analyzer. Up to five different non-reactive adsorptives, for
example, N
2,
Ar, CO
2
, and Kr, plus helium for free space can be attached to the analyzer
simultaneously.
Appropriate two-stage regulators which have been leak-checked and specially cleaned are required.
Pressure relief valves should be set to no more than 30 psig (200 kPag). Gas regulators are available
from Micromeritics; refer to
ORDERING INFORMATION
, page
8-1
.
Degasser Options
• SmartPrep 065