Hach-Lange CLT10 sc - Manual (Page 12)

System start up
Make sure all mechanical, electrical and plumbing tasks have been correctly done before starting
flow through the system.
1. Apply power to the controller.
When powered on for the first time, the controller displays the Language, Date Format and
Date/Time screens in order.
2. Set the language, date and time in the controller if this has not been done. Refer to the controller
user manual for more information on how to set these options.
The controller scans for connected devices.
3. Make sure the cleaning port and the grab sample port are closed, then open the ON/OFF valve
on the sample line to start the flow of water through the system.
The chlorine and pH flow cells will fill with water.
4. Make sure the flow sensor LED is on. If the LED is not on, adjust the flow control valve to
increase the flow.
The flow sensor LED will be on when the flow is sufficient for good sensor operation. If the flow is
too high, the LED may not be lit. Make sure the float is approximately aligned with the flow
alignment mark.
5. Check for leaks or blockages in the tubing and the flow cells. Shut off the flow to the panel if any
problems are discovered and make the necessary repairs.
6. When the system has sufficient flow, clear any warnings that appear on the controller display by
doing the suggested operations.
7. Push the HOME key.
The main measurement screen appears and shows the chlorine, temperature and pH (if a pH
sensor is connected) measurement values.
Maintenance
D A N G E R
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
Tubing replacement
Replace the tubing at least once a year. Replace brittle, cracked or leaky tubing immediately.
Replace old, discolored, fouled or damaged tubing with tubing of the same diameter and type
(Teflon
® or PVDF tubing).
Clean a sensor flow cell
Clean a flow cell as necessary to remove deposits. Clean a flow cell if it becomes heavily
contaminated. Replace a flow cell if it becomes damaged, discolored or not transparent. It is not
necessary to remove a flow cell from the panel in order to clean it.
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.
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.
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