Electrochemical chlorine sensor CL4.2

for water treatmentfor process control4-20 mA

Description
The CL4.2 free chlorine sensor is a German-made, membrane-covered amperometric two-electrode sensor with integrated electronics and an internal temperature sensor for automatic temperature compensation. It measures pH-dependent residual (free) chlorine and requires calibration using the DPD-1 method. No zero-point adjustment is necessary. Measurements can be influenced by pH variations and the presence of ozone (O3). The sensor is designed for water without surfactants to avoid membrane contamination and must be operated in a dedicated flow cell to satisfy flow and pressure requirements.

Special features

• short response time (T90 ≈ 30 s)
• easy handling and maintenance

Applications

• swimming-pool water
• drinking water
• service water
• process water

Ambient conditions

• stable pH value (avoid rapid pH shifts)
• no surfactants in the measuring water
• maximum measuring water temperature: 45 °C (no ice crystals)
• maximum pressure: 1 bar (observe flow cell configuration)

Technical specifications

• Model: CL4.2
• Measurement parameter: free chlorine, pH-dependent
• Measuring ranges / resolution: 0.005…0.500 ppm: 0.001 ppm; 0.005…2.000 ppm: 0.001 ppm; 0.05…20.00 ppm: 0.01 ppm; 0.005…5.000 ppm: 0.001 ppm; 0.5…200.0 ppm: 0.1 ppm; 0.05…5.00 ppm: 0.01 ppm; 0.05…10.00 ppm: 0.01 ppm; 0.5…100.0 ppm: 0.1 ppm
• Response time: T90 ≈ 30 seconds
• Measuring water temperature: 0 … +45 °C (no ice crystals)
• Ambient temperature: 0 … +55 °C
• Temperature compensation: automatic via integrated temperature sensor; avoid sudden temperature changes
• Max. allowed working pressure: operation with retaining ring in flow cell (FLC): up to -0.5 bar (no pressure impulses/vibrations) and up to -1 bar (no pressure surges/vibrations) depending on configuration
• Flow rate (face velocity): approx. 15–30/h (33–66 cm/s) in flow cell; small flow rate dependence
• pH range: pH 6 – pH 8 (observe HOCl dissociation equilibrium)
• Run-in time (first start-up): approx. 1 hour
• Zero point adjustment: not necessary
• Protection class: 5-pole M12 plug-on flange: IP68; 2-pole terminal with mA-hood: IP65
• Material: semipermeable membrane, PVC-U, ABS