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Maintenance
DRAIN PINCH VALVE TUBING REPLACEMENT
7.3
The drain tubing that is pinched closed by the drain valve should be replaced every 3 months due
to wear on the tubing by the repeated pinching of the tubing by the valve. Failure to replace this
tubing according to the scheduled maintenance cycle will result in tubing failure due to excessive
wear. Drain tubing failure will not allow the proper level of sample to be maintained in the
flowcell, leading to poor readings and calibration failure. Drain tubing failure will also result in
the leakage of sample and reagents into the enclosure and onto the drain valve which can result in
permantant damage to the drain valve pinch mechanism and other components.
To replace the drain tubing:
1. With the analyzer in stand-by mode, perform a manual command of DRAIN for 10
seconds to empty the flowcell.
2. Disconnect the drain tubing from the T fitting on the underneath of the analyzer
enclosure.
3. Pull the drain tubing through the opening and into the enclosure.
4. Press the pinch valve in to release the tubing from the pinch mechanism and pull the
tubing through the opening in the side of the pinch valve.
5. Disconnect the drain tubing from the bottom nipple of the flowcell. Take care that the
flowcell is made of glass and is fragile.
6. Discard the drain tubing.
7. Connect the new drain tubing to the bottom of the flowcell.
8. While pushing in on the drain valve, push the drain tubing into the drain valve pinch
mechanism.
9. Feed the drain tubing through the bottom of the enclosure.
10. Connect the drain tubing to the T fitting.
11. Perform a manual command of sample #1 for 25 seconds and once the flowcell is filled
with sample, verify that the sample level is maintained by the drain valve. If the sample
level is dropping with the drain valve closed, reposition the drain tubing in the pinch
mechanism so that the level of sample in the flowcell is maintained.
REAGENT PUMP TUBING REPLACEMENT
7.4
The reagent pump tubing should be replaced every 3 months due to the repeated compression of
the tubing by the pump rollers. Failure to replace this tubing according the scheduled
maintenance cycle will result in tubing failure due to excessive wear. Excessive wear of the
reagent pump tubing will cause inaccurate reagent injection volumes, leading to poor results and
failed calibration. Reagent pump tubing failure will lead to reagent leakages inside the reagent
pump housing which will cause permanent damage to reagent pumps and other components.
To replace the reagent pump tubing:
1. With the analyzer in standby mode, pull the reagent straw from the reagent bottle and
perform a maual command of add reagent #1 for 60 seconds to empty the reagent tubing
of reagent.
2. Use the allen key to remove the 3 screws holding the reagent pump faceplate in place.
3. With the faceplate removed, pull the reagent tubing from the reagent pump along with the
pump rollers.
4. Disconnect the reagent pump tubing from the reagent straw tubing and the flowcell cap
tubing and discard.
5. Check pump rollers for signs of excessive wear and replace if neccessary. The rollers
47
Waltron User Manual 101-016-B.3
3041 Silica Analyzer
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