Hach Chlorine Sensor User Manual page 5

concentration in water. The free chlorine sensor measures the
concentration of free chlorine (generated from inorganic chlorine
products) in water. The total chlorine sensor measures the concentration
of total chlorine (free chlorine and combined chlorine) in water.
Variations in the pH value have an affect on the accuracy of the chlorine
measurement. The chlorine value shown on the controller usually
decreases at about 10% per pH unit increase.
This sensor has an internal temperature sensor that increases the
accuracy of chlorine measurement. The temperature measurement
signal is used internally by the sensor for automatic temperature
compensation. The temperature measurement signalis not shown on the
controller.
This sensor is designed to work with the digital gateway for the CLF10sc
and CLT10sc Reagentless Chlorine Analyzer and one of the sc series
controllers for data collection and operation.
Figure 1 shows the free chlorine sensor and total chlorine sensor.
Figure 1 Sensor overview
1 Electrode of the free chlorine
sensor
2 Membrane cap
3 Membrane
Sensor LEDs
The green LED and orange LED located inside the transparent area of
the chlorine sensor indicate the conditions of the power supply, sensor
signal polarity and electrochemical cell.
4 Vent hole in membrane cap
5 Rubber band
6 Electrode of the total chlorine
sensor
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