Find Blockages - Hach QC8500 Series 2 User Manual

Fia automated ion analyzer
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Troubleshooting

6.5.1 Find blockages

74
Figure 63 Flow blockages
After determining the suspect line, it is necessary to follow it from the glass weight at the
entrance of the reagent to the waste container after the flow cell.
Check every connection of the suspect line, starting from the nipple that holds the glass
weight. Move towards the pump and on the manifold.
In order to find the clog, systematically disconnect each fitting. Start from the left side of
the system, by the pump and move towards the manifold.
When the peristaltic pump makes an unusual noise, lift all the lines to see if air is
aspirated. Check if the carrier line has liquid coming out of it. This indicates that the
carrier line is the suspect line.
Check the nipple by the glass weight to make sure there is no deposit obstructing
the aperture.
Disconnect the carrier line fitting that is attached to the carrier pump tube adapter,
which is between the pump tube and the valve. If the flow problem is still present when
the carrier line is disconnected, find the clog or crimp located before the disconnected
point. If the flow moves forward, it is evident there are no total clogs up to that point.
Put the carrier connection back in place. The flow problem will be back. Continue this
process to find the clog or see if there are any more blockages down stream.
Unscrew the connector at port 2 of the valve. If the flow problem disappears, it is
evident that there are no clogs up to that point before the valve. Then reconnect port 2
and continue to look for the clog. If after disconnecting port 2 the problem does not go
away, there is an indication of a clog between the pump tube adapter and the
valve connector.
Unscrew the valve connector at port 3. If nothing comes out of port 3, there is an
internal clog in the valve or a blockage in the sample loop. Otherwise, continue to
check each connection on the manifold with this process. Clogs can be eliminated by
cleaning the connectors (tees, unions, etc.) or replacing the Teflon tubing.

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