Total Organic Carbon Analyzer Advanced User Guide (from TOC_AUG_20100429)
Manual Information
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User Guide Contents
Topic | See page… |
1.0 Introduction | 2 |
2.0 TOC Flow Paths | 3 |
3.0 TOC System Installation | 6 |
4.0 Troubleshooting | 9 |
Introduction
TOC Flow Paths
The liquid sample is delivered by syringe pump through the teflon tubing to the 4-port valve, which rotates to four fixed positions (Fig 1 and Fig 2):
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- Normally the Gas Generator should be connected to the TOC through blue plastic tubing. In this case, the outlet flow rate of the Gas Generator is controlled by the TOC flow controller (150 mL/min). If the Gas Generator outlet flow line is disconnected and open to the atmosphere, the flow rate will vary, depending on the inlet pressure. When outlet flow is higher than 1250 mL/min, the Gas Generator front panel overflow indication light will turn yellow. In this situation, the technician should correct the flow rate, because overflow conditions will cause the Gas Generator catalyst module to cool and will not produce appropriate quality air.
- The outlet flow reading may drop below 150 mL/min or have no flow at all. This will significantly affect the TOC flow rate. The most common reason for such a malfunction is the final filter or other filters are clogged. Replace the filters to fix this problem.
- If the CHECK SYSTEM light located on the bottom of the front panel starts flashing, and especially when it turns to a permanent yellow light, the catalyst unit needs to be exchanged for a new one. Normally happens once every 2–3 yr of constant Gas Generator use.
- Every 4–5 min a pneumatic switch triggers audibly between the dryer and co-remover towers on the back of the Gas Generator. If the interval time between switches is ~10 min, there may be problems with the Gas Generator.