Micromeritics FlowSorb III 2305 Operator's Manual page 53

FlowSorb III
10. Record the reading for subsequent use.
Each valve on the Multigas Manifold has its own erasable tab for recording
its calibration information. It is also recommended that you record the nitro-
gen composition of the gas bottle connected to each valve on the tab so that
it is readily available when needed. Figure 3.1 shows typical data recorded
as suggested here.
Figure 3.1. Manifold With Typical Calibration and Composition Values
11. Repeat the calibration procedure for each gas mixture and record calibration
information accordingly. Wait a few minutes after shifting from one gas to
another to allow the previous gas to be flushed from the instrument. The in-
strument display with Det depressed will cease registering a change as soon
as the new gas has thoroughly flushed from the instrument.
The numbers will fluctuate somewhat from instrument to instrument and will
vary, of course, with gas composition. Typical numbers are shown in Table
3.1 and are for illustrative purposes only.
Mar 2012
Table 3.1. Typical Calibration Numbers
Gas Composition (% N
4.999
9.997
14.993
22.006
Do not use these data; they are illustrative only.
Performing a Multipoint Surface Area Measurement
) CALIBRATE Setting
2
91
101
111
124
3-13