Hach CLF10sc Manuel D'utilisation page 5

measurement internally and does not transmit the measurement to the controller display. A pressure
regulator kit and an acidification and cleaning kit are available as accessories.
The chlorine and pH sensors rest in panel-mounted, series-connected flow cells. The flow cells
maintain the sensor-to-sample contact and help prevent the sensors from drying out when the
system is not in operation. Figure 1, Figure 2, Figure 3 show overviews of the system and the flow
cells.
Each sensor connects to the controller through the gateway mounted on the panel. The gateway
converts analog signals from the sensors to digital signals used by the controller. The controller
converts the digital signals to the chlorine, pH and temperature measurement values and shows the
readings in the display. The controller supplies power to the sensors and to the digital gateway.
The controller can be configured to cause an alarm condition or warning if measurement values rise
above or fall below specified values. For information on controller alarms, refer to the controller user
manual.
Note: Refer to the sensor user manual for information about how to store the sensors when the system is not in
operation.
Two analyzer configurations are available: a Grab Sample option (without pH sensor) and a pH
option. The Grab Sample option includes the mounting panel, the chlorine sensor and flow cell, a pH
flow cell without sensor, a flow sensor, the digital gateway and the controller. The pH option includes
these items plus a pH sensor.
A flow control valve regulates the sample flow. A constant flow rate of 30-50 L/h is recommended for
correct sensor operation (see Figure 1). The optimal flow rate is 40 L/hour. A single LED on the flow
sensor shows if the sample flow rate is sufficient. If the LED is not on, the flow rate must be adjusted
until the LED is on. The exact flow rate is not important as long as the LED is on, but the flow must
stay constant within the specifications.
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