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Model TCL Total Chlorine Analyzer
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MODEL TCL SAMPLE CONDITIONING SYSTEM
• NO METAL WETTED PARTS Ideal for seawater
• LOW SAMPLE FLOW (about 15 mL/minute) means little waste
• REAGENT-BASED SYSTEM measures true total chlorine
• FIVE GALLONS OF REAGENT lasts two months
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MODEL 1055-24 CHLORINE ANALYZER (shown)
• TWO LINE, BACK-LIT DISPLAY with easy to use interface.
• TWO INDEPENDENT OUTPUTS
• THREE FULLY PROGRAMMABLE ALARMS
• INPUT FILTER improves stability at low concentrations.
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MODEL 54EA ANALYZER
• THREE LINE BACK-LIT DISPLAY with easy to use interface
• TWO INDEPENDENT OUTPUTS
• THREE FULLY PROGRAMMABLE ALARMS, plus one dedicated fault alarm
• OPTIONAL HART DIGITAL COMMUNICATIONS
• OPTIONAL PID AND TPC CONTROL
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MODEL 499A CL-02 SENSOR
• MEMBRANE-COVERED AMPEROMETRIC SENSOR
• NO TOOLS REQUIRED to change membrane
• MAINTENANCE takes only a few minutes a month
• VARIOPOL CONNECTOR OPTION allows the sensor to be replaced without removing and rewiring cable
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FEATURES AND APPLICATIONS
The Model TCL is intended for the determination of total chlorine in water, including the determination of chlorine in seawater. The system consists of a sample conditioning unit, a sensor, and either a 1055-24 or a 54eA chlorine analyzer.
MODEL TCL SAMPLE CONDITIONING SYSTEM
The Model TCL is a sample conditioning system that permits a single sensor to measure total chlorine in water. The sample conditioning system continuously injects a solution of acetic acid (vinegar) and potassium iodide into the sample. The acid lowers the pH to between 3.5 and 4.5 and allows total chlorine in the sample to quantitatively react with the potassium iodide to produce iodine. The sensor measures the iodine concentration, and the analyzer displays the total oxidant concentration in ppm as Cl2.
The Model TCL can also be used to measure chlorinated seawater. Seawater contains about 50 ppm bromide. When chlorine, as sodium hypochlorite or chlorine gas, mixes with seawater, the chlorine reacts with bromide to form a mixture of bromine oxidants, primarily hypobromous acid. In the TCL, the hypobromous acid readily oxidizes iodide to iodine.
The figure at right is a schematic diagram of the system. The sample enters the sample conditioning enclosure and flows to an overflow sampler from which the sample pump takes suction. Excess sample drains to waste. At the same time, the reagent pump draws reagent, a solution of potassium iodide in vinegar, from the reagent carboy and injects it into the suction side of the sample pump. The sample and reagent mix as they pass through the pump, and total chlorine in the sample is converted to the chemically equivalent amount of iodine. The flow rates are 11 mL/min for the sample and 0.2 mL/min for the reagent.
The treated sample next enters the flow cell. Bubbles injected into the flow cell produce turbulence, which improves the stability of the reading. A membrane-covered amperometric sensor in the flow cell measures the concentration of iodine. The analyzer receives the raw signal from the sensor and displays the concentration of total chlorine. Display units are ppm (mg/L) chlorine as Cl2. The treated sample leaves the flow cell and drains to waste along with the excess sample.
MODEL 1055-24 SOLU COMP II CHLORINE ANALYZER
The Model 1055-24 Solu Comp II chlorine analyzer is designed for the continuous determination of chlorine in water. It is used with the Model 499ACL-02 sensor and the TCL sample conditioning system.
The Solu Comp II analyzer is housed in a weatherproof, corrosion- resistant, NEMA 4X enclosure. It is suitable for wall, panel, or pipe mounting. Operation of the analyzer is through a membrane keypad. A back lit, two-line display shows the total chlorine level as well as temperature. Usercustomized displays are available.
Menu screens for calibrating and programming are simple and intuitive. Plain language prompts in English, German, Italian, Portuguese, French, or Spanish guide the user through procedures. There are no service codes to enter. Information and diagnostic screens are available at the push of a button.
The Solu Comp II has two isolated, continuously variable 4-20 mA outputs. Outputs can be assigned to total chlorine concentration or to temperature. Output dampening and linear or logarithmic output are also available.
The Solu Comp II has three programmable alarm relays. Alarms can be assigned to total chlorine concentration or temperature. The third alarm can be configured as a fault alarm. The fault alarm activates when an analyzer or sensor fault occurs.
The analyzer fully compensates chlorine readings for changes in membrane permeability caused by temperature changes.
Solu Comp II Model 1055-24 for the determination of total chlorine is a single input instrument. The Solu Comp II is also available with dual input, for example, chlorine and pH. For additional information concerning the dual input option see Product Data Sheet (PDS 71-1055).
MODEL 54eA ANALYZER
The Model 54eA analyzer can be used with the TCL sample conditioning system and 499ACL-02 sensor for the continuous determination of chlorine in water.
The Model 54eA analyzer is housed in a rugged NEMA 4X weatherproof, corrosion resistant enclosure of epoxy-painted aluminum. It is suitable for panel, pipe, or wall mounting. Operation of the analyzer is through a front panel membrane keypad. The large back-lit dot matrix display continuously indicates chlorine concentration in large numerals along with temperature, current output, and two programmable process parameters, such as alarms or diagnostic variables. Menu screens for calibrating and programming the analyzer are simple and intuitive. Plain language prompts in English, Spanish, Italian, German, or French guide the user through instrument configuration and sensor calibration
The Model 54eA is a member of the Rosemount SMART FAMILY® of instruments. It is designed to communicate with the Model 375 HART® communicator or any host that supports the HART communication protocol.
Two independent isolated outputs provide either a 0-20 mA or 4-20 mA output and can be assigned to chlorine or temperature. The controller option allows PID control acting on chlorine or temperature.
Three, fully programmable process alarms are standard. One relay can be configured as an interval timer. An overfeed timer is available for any one process relay, and one relay can also be used as an interval timer. The TPC option allows any alarm relay to be used for Time Proportional Control. The analyzer fully compensates chlorine readings for changes in membrane permeability caused by temperature changes.
For additional information, see Product Data Sheet 71-54e.
MODEL 499A CL-02 SENSOR
The Model 499ACL-02 total chlorine sensor is used in the TCL sample conditioning system. Although the sensor is called a chlorine sensor, it really measures iodine. The iodine comes from the reaction between halogen oxidants in the sample and the acetic acid/potassium iodide reagent added by the sample conditioning system.
The sensor consists of a gold cathode and a silver anode in an electrolyte solution. A silicone membrane, permeable to iodine, is stretched over the cathode. The analyzer applies a voltage to the cathode sufficiently negative to reduce all the iodine reaching it. Because the concentration of iodine in the sensor is always zero, a concentration gradient continuously forces iodine from the sample through the membrane into the sensor.
The reduction of iodine in the sensor generates a current directly proportional to the diffusion rate of iodine through the membrane, which is directly proportional to the concentration of iodine in the sample. Because the iodine concentration depends on the amount of total chlorine in the sample, the sensor current is ultimately proportional to the total chlorine concentration.
The permeability of the membrane to iodine is a function of temperature. A Pt100 RTD in the sensor measures the temperature, and the analyzer uses the temperature to compensate the total chlorine reading for changes in membrane permbeability.
Sensor maintenance is fast and easy. Replacing the membrane requires no special tools or fixtures. Simply place the membrane assembly on the cathode and screw the retainer in place. Installing a new membrane and replenishing the electrolyte takes only a few minutes.
PERFORMANCE SPECIFICATIONS — COMPLETE SYSTEM
• Linear Range: 0 to 20 ppm (mg/L) as Cl2 (for higher ranges, consult factory)
• Linearity (per ISO 15839): 0-10 ppm: 2%; 0-20 ppm: 3%
• Response Time: Following a step change in concentration, the reading reaches 90% of final value within 7 minutes at 25°C.
• Drift: At about 1.5 ppm in clean water and constant temperature, drift is typically less 0.05 ppm over two weeks.
• Detection Limit (per ISO 15839): 0.02 ppm (mg/L) in clean water at room temperature
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