TURTLE
TOUGH
®
7
Contaminant
Secondary MCL
Aluminum
0.05 to 0.2 mg/L
Chloride
250 mg/L
Color
15 color units
Copper
1.0 mg/L
Corrosivity
Non-corrosive
Fluoride
2.0 mg/L
Foaming agents
0.5 mg/L
Iron
0.3 mg/L
Manganese
0.05 mg/L
pH
6.5 - 8.5
Silver
0.1 mg/L
Sulfate
250 mg/L
Total Dissolved Solids (TDS)
500 mg/L
Zinc
5 mg/L
Turbidity
not to exceed 5 NTU
NO CORROSION INHIBITORS PERMITTED
3-Electrode Total Chlorine Sensor Description & Operation
This membrane-covered, amperometric sensor is used to measure the total chlorine concentration in
water.
The sensor detects "free chlorine" liberated from organic chlorination products (chlorine gas,
hypochlorite, etc.) and "bound chlorine", for example chloramines. It cannot distinguish between
various forms of chloramines.
This sensor can only be used in media similar in quality to drinking or swimming pool water. Typical
applications include the monitoring of filtered, treated drinking water and swimming pools.
Iron and manganese levels above USEPA Secondary Drinking Water Standards MCL will prevent the
operation of the 3-electrode chlorine sensor.
The sensor is not suitable for detecting the absence of chlorine.
This sensor has a 3-electrode measuring system. Three electrode sensors work on the potentiostatic
principle. The reference and counter electrode are separated. The working electrode is membrane-
covered. Together with the reference electrode, it is located in an electrolyte chamber that contains a
special pH buffered electrolyte and is separated from the process medium. The potential of the
reference electrode is especially constant due to its high resistance. The current flows through the
counter electrode. The sensor is loop powered. This loop power is generated by the analyser
electronics and supplied through the cable that transmits the residual signal.
The working electrode (cathode) is made of gold (Au) while the reference electrode is made of
silver/silver chloride (Ag/AgCl). The counter electrode is made of stainless steel.
In this measurement method the chlorine diffuses out of the process medium and through the
selective membrane, inducing an electrical signal in combination with the electrolyte on the working
electrode. The signal, which is proportional to the concentration of chlorine, is amplified by the
electronics. Due to an integrated temperature compensation system, the measurement signal is
independent of the medium temperature.
Summary of Contents for TT-ISE-CL2
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