The Model TCL is a sample conditioning system used with the 499ACL-02 total chlorine sensor for the determination of total chlorine in water, including the determination of total oxidants in chlorinated seawater.

The sample conditioning system permits a single sensor to measure total chlorine in water. It 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. Five gallons (19 L) of reagent lasts two months.

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

GENERAL
Enclosure: Fiberglass reinforced polyester, NEMA 3 (IP53) suitable for marine environments
Mounting: Wall
Reagent carboy: 5 gal (19L); dimensions (l x w x h) 12.5 x 9.5 x 13.5 in (318 x 233 x 343 mm)
Ambient Temperature: 32° - 122°F (0 - 50°C)
Ambient Humidity: 0 - 90% (non-condensing)
Power: 115 Vac, 6.9 W, 50/60 Hz; 230 Vac, 7.0 W, 50/60 Hz
Hazardous Location: The TCL sample conditioning system has no hazardous location approvals.
Pumps: EN 809:1998
Weight/Shipping Weight: 14 lb/16 lb (6.5 kg/7.5 kg)

SAMPLE REQUIREMENTS
Inlet Connection: compression fitting, accepts 1/4" OD tubing
Drain Connection: 3/4" barbed fitting (must drain to open atmosphere)
Inlet Pressure: <100 psig (791 kPa abs)
Flow: at least 0.25 gph (15 mL/min)
Temperature: 32 - 122°F (0 - 50°C)
Total Alkalinity: <300 mg/L as CaCO3. For samples containing <50 mg/L alkalinity, consult the factory.

SAMPLE CONDITIONING SYSTEM
Reagent: Potassium iodide in vinegar.
Reagent Usage: 5 gallons lasts approximately 60 days
Reagent Pump: Fixed speed peristaltic pump, about 0.2 mL/min
Sample Pump: Fixed speed peristaltic pump, about 11 mL/mi