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Total Organic Carbon Analyzer Maintenance
Teledyne Analytical Instruments 47
Figure 5-3: Installing Calibration Adapter
5. To set IR “Zero”, flow 200cc/minute oxygen (or CO
2
-
free air) for 5 minutes. Allow NDIR reading to stabilize.
Select [ZERO]. NDIR reading is reset to 0.
6. To set IR “Span” for the 6 inch (shorter) IR bench, use a
gas calibration standard mixture of 1% CO
2
in pure
nitrogen. For the longer (15 inch) bench, a gas mixture
of 0.1% CO
2
in pure nitrogen is required for. Flow 200
cc/minute of this cal gas for at least three minutes. Allow
NDIR reading to stabilize and then select [SPAN]. NDIR
reading is set to 10,000. Select [OK] to save or
[CANCEL] to reject the calibration setting.
The NDIR unit has now been properly calibrated. Reconnect the
fitting to reactor output tube.
5.3.2 NDIR Service
To remove and service the NDIR, simply follow the illustrated
sequence as described in this section following Figure 5-4.