Chlorine chlorine sensor CH10

electrochemicalfor water treatmentfor process control

Product overview
German-made CH10 free chlorine sensor uses a membrane-covered amperometric 2-electrode system to measure pH-dependent free chlorine, designed for high concentrations in industrial process water. Compatible with inorganic chlorinating agents (NaOCl, Ca(OCl)2, chlorine gas, membrane cell electrolytic chlorine). Requires stable pH (5.0–8.0). Features surfactant resistance, mechanical durability, automatic temperature compensation and protection classes IP65/IP68. Available in analog (4–20 mA) and digital (Modbus RTU) variants. Zero-point adjustment not required; calibration by DPD-1 or iodometry.

Special features

• Suitable for high chlorine concentrations up to 2000 ppm
• Mechanically robust membrane system
• Tolerant to surfactants
• High chemical resistance
• Operates with polluted measuring water

Applications

• Washing of fruit, vegetables and poultry
• Service and process water disinfection control in industrial facilities

Ambient conditions

• Stable pH required: operate within pH 5.0–8.0 (observe HOCl/ClO- equilibrium)
• Measuring water temperature: 0 … +45 °C (no ice crystals)
• Ambient temperature: 0 … +55 °C
• Max. temperature (related entries): 45 °C
• Max. pressure: 1 bar (avoid pressure impulses/vibrations; consult installation notes)

Technical specification (table)
Measurement parameter: Free chlorine, pH dependent
Measuring ranges / resolution: 20…2000 ppm: 1 ppm; 0.05%...0.2% (500…2000 ppm): 100 ppm
Response time: T90 ≈ 8 min.
Measuring water temperature: 0 … +45 °C
Ambient temperature: 0 … +55 °C
Temperature compensation: Automatic, integrated sensor; response time t90 ≈ 8 min; avoid sudden changes (max 5 °C/h)
Max. allowed working pressure: see installation constraints (avoid pressure impulses/vibrations)
Flow rate (face velocity): approx. 15–30 L/h (small flow dependence)
pH range: pH 5.0 – pH 8.0
Run-in time: First start-up approx. 11 h
Zero point adjustment: Not necessary
Protection class: IP68 (5‑pole M12 connector); IP65 (2‑pole mA terminal hood)
Material: Elastomer membrane, PVC-U, PEEK

Technical specifications

• Model: CH10
• Measuring ranges: 20–2000 ppm (resolution 1 ppm); alternative range/resolution noted for 500–2000 ppm
• Response time: T90 ≈ 8 min
• Measuring water temperature range: 0 … +45 °C
• Ambient temperature range: 0 … +55 °C
• Temperature compensation: Integrated, automatic
• Flow rate: approx. 15–30 L/h (face velocity)
• pH operating range: 5.0 – 8.0
• Run-in (first start-up): ≈ 11 hours
• Zero point adjustment: Not required
• Protection class: IP68 (M12 connector) / IP65 (mA terminal hood)
• Materials: Elastomer membrane, PVC-U, PEEK
• Suitable for high chlorine concentrations; chemically robust and surfactant-resistant membrane system