Hach QC8500 Series 2, User Manual

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Troubleshooting
6.6 Injection valve troubleshooting
Keep the valve clean at all times. Proper maintenance will help prevent many problems.
There are two main problems that can occur with the valve: clogs and hardware failure.
Refer to
section 6.5.1 on page 74 to determine if blockages exist in the injection valve. If
the valve does not turn, make sure that the cables are connected properly. A loose valve
cable could also cause problems. Make sure that the valve is connected properly
(
section 4.7.1 on page 44 ). If a motor or any electronic failure occurs, send the valve to
the manufacturer for repair.
6.7 Detector fault
It is important not to connect a detector to the System Unit when the power is on. To
determine if a detector is at fault, run a method (can be a dry run). While running, bounce
the flow cell to see response on the diagram. If the detector does not respond, call the
manufacturer for assistance.
Note: If the detector is unplugged, the baseline will be exactly at zero.
6.8 Flow cell leaks
If the flow cell leaks from the connectors and/or the glass window, change the flow cell
flares and O-rings. Flow cell leaks are typically caused by old flares and old O-rings.
Refer to
section 4.3.3 on page 38 to learn more about the flow cell.
6.9 Sampler troubleshooting
There are some common problems that can be encountered with any sampler model.
6.9.1 Sampler errors
6.9.1.1 Error initializing autosampler
Initialization error can occur when trying to initialize the autosampler in the Configuration
menu or when storing a run.
Possible causes:
• Sampler is turned off.
• The sampler cable is unplugged or defective.
• Sampler was not installed properly. Refer to section 3.3 on page 21 .
• The configuration of the sampler has been changed and it does not match what has
been specified on the computer. Verify the configuration of the hardware and software.
Refer to
section 3.3 on page 21 . Make sure that Omnion has been configured to use
the correct sampler. Verify the system is configured to use the correct COM port. If the
software has been reloaded, the configuration may have changed.
• The tan PEEK tubing that controls the Z-arm has become crimped and the probe
cannot move properly. Replace the PEEK tubing or contact Technical Support
for assistance.
• The sampler has encountered a jam in one of the direction of travel. Make sure there
are no obstructions.