Navigator 600 Phosphate
Multi-stream
Appendix C – Troubleshooting
72
IM/NAV6P/MS–EN Rev. F
C.3.1 Air in System
Symptom
Action
Air in system
Check for air bubbles in the reaction block and in the tube feeding the optical unit.
If bubbles are found, check if they are present in the sample line or originate from one or more of the
reagents.
Note
: Air can enter the system only from the suction side of the 2 pump assemblies.
1. From the sample line:
a. Check tube connections from the constant-head unit to the pump assembly, especially the
sample filter assembly – tighten if necessary.
b. Check the solenoid valves and ensure the screws on the reverse side are tight.
2. From the reagent line(s):
a. Check the pump tube connections.
b. Check the reagent bottle caps.
3. In the reaction block and tubing:
a. If bubbles in the reaction block and tubing are flowing smoothly, the problem is likely to be a
poor seal on one or more of the tube connectors.
b. Tighten tube connections as above. If the problem persists, replace the affected tubing
assembly – see Appendix H, page 82.
4. If bubbles are pulsing:
a. Check if there is a blockage or partial blockage. Blockages can be caused by overtight tube
connectors.
b. Check the tightness of all connectors in the sample or reagent line affected.
