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5.10 Flow cell maintenance
5.11 Detector module replacement
•
The rotor seal in the valve module wears with use. Hence, routine replacement of the
module is required. The main cause of early failure is the presence of abrasive
particles in the samples. Filter or centrifuge the sample to avoid scratches on the rotor
seal surface.
•
If leaks occur and the above suggestions do not help, contact the manufacturer for a
job number and send the unit in for service immediately to reduce the severity of
the damage.
Leaks from the flow cell can cause problems, such as no response from the detector.
Note: Leaks are usually caused by a poorly sealed flare.
When a flow cell appears to leak:
1. Remove the flow cell immediately to keep all liquids away from the electronics inside
the detector head.
2. Dry and clean all surfaces.
3. Remove the fitting from the flow cell.
4. Replace the three O-rings and both flares.
5. Clean the ports of the flow cell with a cotton swab and deionized water
and reassemble.
Note: Leaks can appear to come from the flow cell edges. Make sure that there are tightened,
proper seals at both ports.
New flow cells may need to be cleaned if air bubbles seem to 'stick' inside the cell.
Once the manifold is installed:
1. Place all the reagent lines in a 0.25 M sodium hydroxide solution.
2. Run the caustic solution for about 5 minutes.
3. Place all the reagent lines in DI water to flush out the sodium hydroxide. Run the DI
water for at least ten minutes.
Never connect or disconnect the detectors with power on in the System Unit. This may
lead to detector failure.
Note: Turn off System Unit power before the connection or disconnection of the detector module.
Refer to
Figure 51 on page
To replace the detector module:
1. Lift the detector module from the channel.
2. Loosen the set screws with a
fiber optic cables.
3. Disconnect the detector quick-connect cable and the two fiber-optic cables.
4. Lift the detector module free of the channel.
5. Connect the detector cable and fiber optic cables to the replacement module.
6. Snap the detector module into place in the channel.
60.
1
/
-inch Allen wrench to allow for easy removal of the
16
Maintenance
59
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Table of Contents
Troubleshooting
