Model 498CL pH-Independent Free Chlorine Sensor
MEASURE FREE CHLORINE without sample treatment and without an auxiliary pH sensor
SENSOR RESPONSE IS PRACTICALLY INDEPENDENT of pH between pH 6.5 and 10
AUTOMATIC CORRECTION for changes in membrane permeability caused by temperature
EASILY REPLACED MEMBRANE; no special tools required
VARIOPOL CONNECTOR OPTION allows the sensor to be replaced without running new cable
|
The Model 498CL-01 sensor is intended for the continuous determination of free chlorine (hypochlorous acid plus hypochlorite ion) in water. The primary application is measuring chlorine in drinking water.
The 498CL-01 is a three electrode, membrane-covered amperometric sensor. Unlike amperometric free chlorine sensors from other manufacturers, the 498CL-01 requires neither sample pretreatment nor a pH correction. Instead, an acidic internal solution lowers the pH of the sample as it diffuses into the sensor, converting hypochlorite into hypochlorous acid, the form of free chlorine amperometric sensors can measure. Between pH 6.5 and 10 the chlorine reading decreases less than 4% per unit increase in pH. Below pH 6.5 the change is less than 1%.
The linear range of the sensor is 0 to 20 ppm. SENSOR SPECIFICATIONS
Linear Range: 0-20 ppm (mg/L) as Cl2. For higher ranges consult the factory.
Linearity 0 - 2 ppm: ±0.05 ppm following calibration at about 2 ppm
Linearity 0 - 20 ppm: 1% (per IEC 60746)
Wetted Materials: PVC, polyethersulfone, polyester, Viton1, silicone, copper
Cathode: Gold mesh
Accuracy: Accuracy depends on the accuracy of the chemical test used to calibrate the sensor.
Sensitivity to pH: Between pH 6.5 and 10 sensor signal changes < 4% per unit change in pH. Below pH 6.5 the change is < 1% per unit change in pH.
Sample Conductivity: >10 uS/cm
Interferences: Monochloramine, dichloramine, and permanganate
Response Time: < 2 minutes to 90% of final value following step change at 1.2 gal/hr (75 mL/min) and 25ºC
Sample Flow: 1.2 gal/hr (75 mL/min). Changing flow from 0.5 to 2.5 gph (30 to 160 mL/min) increases the sensor signal by about 30%. Increasing flow increases pH dependence.
Pressure: Sample must drain to open atmosphere. No back pressure allowed.
Temperature: 32 to 122ºF (0 to 50ºC)
Process Connection: Sensor must be used in flow cell PN 24091-01
Electrolyte Life: 3 months (approx)
Cable Length: 25 ft (7.6 m) (std integral); 300 ft (91 m) (max)
Weight/Shipping Weight: Sensor with integral cable: 2 lb/1.0 kg (3 lb/1.5 kg)
Sensor with VP connector: 1 lb/0.5 kg (2 lb/1.0 kg)
Note: Weights and shipping weights are rounded up to the nearest 1 lb or o.5 kg.
1 Viton is a registered trademark of EI duPont de Nemours.
FLOW CELL SPECIFICATIONS
Part Number: 24091-01 (low flow cell with bubble sweeping nozzle)
Wetted Materials: polycarbonate, polyester, 316 stainless steel, silicone
Process Connections: ¼-inch OD tubing compression fitting or ¼-inch FNPT
Maximum Inlet Pressure: 65 psig (549 kPa abs)
RECOMMENDED ANALYZERS
The 498CL-01 sensor can be used only with the 1055-24, 1055-24-32, and 54eA analyzers. It cannot be used with the 1054BCL, 5081-A, and Xmt-A. |
|
|
