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Maintenance
5.3.10 Metering Valve (P/N ST16050)
If no O
/air flow to the sparger (P/N ST20025) is observed (no
2
bubbles), check for tubing and fitting leaks, restrictions and adjust
metering valve (be careful to return to previous indicated bubble rate).
If flow cannot be restored, replace the metering valve (P/N ST16050)
according to the directions below. See Figure 5-12.
To replace the metering valve:
1. Turn carrier gas (Air/O
2. Turn pumps OFF.
3. Remove fittings and tubing.
4. Remove metering valve.
5. Recalibrate TIC if TIC and/or TOC–TRUE analysis is
required. NPOC analysis only does not require
recalibration.
6. Reinstall metering valve in reverse order.
Teledyne Analytical Instruments
Figure 5-11: Mass Flow Controller
) OFF.
2
Model 6750
60
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