Covered-membrane three-electrode method
Covered-membrane three-electrode analyzer · PDCL-700
Online Free Chlorine Analyzer
A covered-membrane three-electrode configuration designed to reduce the effect of pH variation and support drinking water, secondary supply, heating, circulating and cooling-water monitoring.
0.05–20.00 mg/LpH 4–9IP68 sensor
Model-specific values checked against the supplied sheet
The five products retain separate principles, ranges, sample limitations and interfaces. Final configuration is controlled by the project confirmation document.
01
Measurement method and product highlights
Membrane design reduces the influence of sample pH fluctuation
Fast response and stable digital output
Tail aviation connector and documented IP68 sensor protection
Three 4–20 mA outputs, three configurable relays and Modbus RS485
02
Verified technical specifications
Confirm the disinfectant, required free or total chlorine result, normal and peak range, sample pH, conductivity, temperature, pressure, flow-cell conditions, calibration method and control interfaces before quotation.
- Measurement principle
- Covered-membrane three-electrode method
- Measurement range
- 0.05–20.00 mg/L
- Resolution
- 0.01 mg/L
- Accuracy
- ±5% of reading or ±0.05 mg/L, whichever is greater
- Sample flow
- 250–500 mL/min
- Operating temperature
- 0–40°C, non-freezing
- Storage temperature
- 0–50°C
- Pressure rating
- ≤0.3 MPa
- Sample pH
- 4–9
- Power supply
- 85–500 VAC; 9–36 VDC
- Analog output
- 3 × 4–20 mA
- Relays
- 3 configurable relays
- Communication
- Modbus RS485
- Sensor dimensions
- Ø30 × 242 mm
- Protection
- Sensor: IP68 / NEMA6P; transmitter: IP66 / NEMA4X
- Weight
- Sensor: 750 g; transmitter: 1.35 kg
- Cable
- 3 m
03
Recommended process fit
Drinking-water treatment
Continuous disinfectant-residual monitoring at plant process and outlet points.
Distribution and secondary supply
Verify residual chlorine through distribution networks and secondary-supply facilities.
Cooling and process water
Support disinfectant control in circulating-water and industrial-water systems.
04
Items to confirm before quotation
Confirm the target and water matrix before choosing DPD colorimetry, constant-voltage amperometry, micro-MEMS or a covered-membrane electrode.
- 01Disinfectant and free chlorine, total chlorine, chlorine dioxide or active-oxygen target
- 02Normal, peak and alarm range plus required detection limit
- 03pH, conductivity, temperature, pressure and sample cleanliness
- 04Flow-cell conditions, calibration, reagent or membrane maintenance
- 05Power, 4–20 mA, relays, Modbus, quantity and destination
05
Project documents available on request
After receiving the operating conditions, we prepare the configured datasheet, flow-cell and mounting confirmation, I/O schedule and quotation. The clean image is not a dimensional drawing.
Get a quote- Configured datasheet→
- Sample and mounting confirmation→
- Cable and I/O schedule→
- Project quotation→
06
Compare other chlorine models
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Selection questions
Do all five analyzers use the same measurement method?+
No. CL-201 uses DPD colorimetry; PDCL-400 uses constant-voltage amperometry; PDCL-500M uses a micro-MEMS electrochemical structure; PDCL-700 and PDCL-600 use different membrane-electrode designs.
Can the model be selected only from the range?+
No. Confirm the disinfectant, free or total result, pH, conductivity, temperature, pressure, flow and maintenance method.
Can the product image be used as an installation drawing?+
No. The image provides consistent public presentation. Dimensions, interfaces, accessories and flow cells come from the datasheet and order confirmation.
Contact FUNEL
Tell us what you need to measure.
We will respond with a recommended configuration, supporting documentation and quotation.