Micromeritics FlowSorb III 2305 Operator's Manual page 89

FlowSorb III
Tube 1 (see Figure D-1) primarily is used as the cold trap tube. It also can be
used for sample quantities up to a bulk volume of 0.1 cm
creases the gas velocity across the sample, it minimizes the creation of thermal
gradients. Thermal gradients cause the separation of mixed gases and are evi-
denced by the presence of shoulders on recorded adsorption and desorption
peaks. Such shoulders give distorted results. Low specific surface materials, per-
haps as low as 0.1 m
quantity of sample in the more common tube, are sometimes more accurately ana-
lyzed using a much smaller sample in this tube.
Tube 2, having an internal sample space of 1.5 cm
ple volume of up to approximately 1 cm
holder.
Tube 3 has the same internal dimensions as Tube 2. Its outlet stem has a smaller
internal diameter to increase gas velocity and turbulence and, hence, to diminish
thermal gradient effects.
Tube 4 has an internal sample space of 7.0 cm
volumes up to 4.7 cm
Tube 5 is designed for monolithic samples. It will accommodate cylinders up to 2
cm in diameter and 3 cm long.
Aug 00
SAMPLE TUBES
2
/g, which might be thought best measured using a large
3
, is the primary general purpose sample
3
.
3
. Because its use in-
3
and usable with a bulk sam-
3
, and is usable for sample bulk
Appendix D
D-1