Hach CLF10sc, User Manual

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Note: Never use detergents or surfactants to clean a chlorine flow cell.
1. Stop the source flow to the panel.
2. Remove the chlorine sensor and put the sensor in a container filled with a sample of the
chlorinated water.
Note: Do not disconnect the sensor from the power. If power is removed from the chlorine sensor, the sensor
must be conditioned and calibrated before use.
Note: The removal of a sensor from a flow cell with the sensor cable attached will cause a change in the sensor
signal outputs. Refer to the controller manual for more information on the Hold Output feature.
3. Rinse the flow cell with water and scrub the flow cell with a soft bristle brush to remove deposits.
4. Rinse the flow cell with water.
5. If the flow cell is not sufficiently clean, soak the flow cell for 10 to 15 minutes in a 1:3 mixture of
3-5% hydrogen peroxide solution and vinegar.
Note: Commercial rust removal liquids may be used in case of heavy contamination. However, this is not
recommended because they can cause damage to the flow cell material.
6. Rinse the flow cell with water.
7. Install the sensor in the flow cell and start the sample flow.
6.3 Replace the flow sensor
Under normal conditions, the flow sensor does not require regular maintenance or replacement.
However, if the LED flow indicator does not light when the float is between the MIN and MAX marks
and power is applied, the sensor may need to be replaced. To replace the flow sensor, do the
illustrated steps that follow.
Note: It is not necessary to remove the chlorine sensor, drain the flow cell or power down the controller to replace
the flow sensor.
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