Electrochemical chlorine sensor CP4MA*-AT

for process controlfor marine applications4-20 mA

Overview
The CP4MA*-AT is a German-made membrane-covered amperometric potentiostatic 3-electrode sensor for continuous measurement of total chlorine in seawater and vessel ballast water. It features reduced pH dependence (pH 4–12), partial tolerance to surfactants, automatic temperature compensation and a stable 4–20 mA output. Certified ATEX/IECEx as intrinsically safe for Zone 1, it is designed for installation in a flow chamber (approx. 15–30 l/h) with a T90 response time of ≈ 2 minutes. Zero-point adjustment is not required; calibration is performed using the DPD-4 method.

Special features

• ATEX / IECEx certified — intrinsically safe for Zone 1
• Membrane-covered amperometric 3-electrode design
• Reduced pH dependence (pH 4.0–12.0) and partial tolerance to surfactants
• Automatic temperature compensation and low maintenance

Applications
Monitoring of seawater and vessel ballast water; onboard treatment and ballast water management systems; process control on marine vessels.

Ambient conditions
• Maximum temperature: 45 °C
• Operating temperature: 0–45 °C
• Maximum pressure: 0.5 bar (no pressure impulses or vibrations)
• Nominal pressure: 0.3 bar (no pressure impulses or vibrations)
• Flow rate in flow chamber: approx. 15–30 l/h
• Run-in time: first start-up approx. 2 h

Technical specification
The sensor measures total chlorine (optionally pH). Measuring ranges and performance depend on electrode configuration.

• Model: CP4MA*-AT
• Measuring parameters: Total chlorine (optional pH)
• Measuring ranges: 0.005…2.000 ppm / 0.05…5.00 ppm / 0.05…10.00 ppm / 0.05…20.00 ppm
• Lower limit of measurement: 0.005 mg/L (depending on electrode)
• Resolution: 0.001 mg/L or 0.01 mg/L (depending on range)
• Response time: T90 ≈ 2 minutes
• Drift: approx. −1% per month (after calibration at 25 °C, pH 7.2)
• pH range: 4.0–12.0 (depending on electrode)
• Material: microporous hydrophilic membrane, PVC-U, PEEK, stainless steel 1.4571
• Output: 4–20 mA
• Max allowable working pressure: 0.5 bar (no impulses/vibrations)
• Nominal pressure: 0.3 bar (no impulses/vibrations)
• Zero point adjustment: not required
• Certification: ATEX / IECEx (intrinsically safe for Zone 1)
• Calibration method: DPD-4 method