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Installation
• Purge gas: A high-purity sample gas may be used to purge.
Argon with a minimum purity of 99.999% should be used.
The exact purge method depends on the sample manifold design
and construction. In general, each sample inlet line must be thoroughly
purged. Sufficient purge time becomes critical when sample lines longer
than 10 feet (3 m) are used.
To purge the analyzer (see Figure 3-2):
Note: Do not purge long lines through the analytical cell. First,
purge them through the purge flow rotameter; then transfer
flow to the analyzer cell as suggested in step 6, below. This
eliminates the possibility of contaminating the analytical cell
and having to purge for an extended period to reach
equilibrium.
1. Close all valves on the sample manifold.
2. Open the valve on sample inlet line to be purged and the purge
rotameter valve.
3. Connect purge gas to the sample inlet line.
4. Adjust flow rate to 1 cfh (0.475 slpm) at no more than 7 psig
(76 kPa), as indicated on the purge rotameter, and purge for at
least one hour.
5. Close the sample inlet valve, and then repeat steps 2 through 4
to purge all other sample inlet lines.
6. After the last sample line and the zero and span gas inlet lines
have been purged, close the purge rotameter valve, open the
valve controlling flow through the analytical cell, and purge the
analyzer with the sample flow rotameter set at 1 cfh (0.475
slpm). Purge the analyzer for a minimum of 6 hours.
7. If cylinder argon is used as a purge gas, reconnect the sample
gas to sample manifold inlet.
3.7 Calibration
The Model 2120 was calibrated at the factory in accordance with
the calibration data shipped with your instrument. Prior to using the
instrument for analysis the calibration must be checked using the factory
Teledyne Analytical Instruments
26
Model 2120
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