Water analyzer W771-DCP4.0

chlorineprocessconductivity

The Online Total Chlorine Analyzer is equipped with a German-made CP4.0 sensor, adopting special osmotic membrane technology. It resists chemical interference (mainly surfactants), reduces pH dependence, and is not restricted by water quality. With fast response, stable performance, low cost, and minimal maintenance, it provides users with reliable and accurate data.Featuring an LCD screen, the instrument can automatically identify measured parameters. It has current 4-20mA and RS485 output, allows free setting of the measurement range, provides high and low limit alarm prompts, and the electrode supports multiple automatic calibration methods. Widely applied in measuring tap water, swimming pool water, medical wastewater, sewage treatment, seawater, high-salt seawater, etc.Working Principle:The entire measurement system mainly consists of two parts: the instrument W771 and the CP4.0 sensor. The instrument displays the disinfectant value (main measured value), the pH value of the aqueous solution (a pH electrode is required for selection), and the working status. It outputs signals such as analog, digital, and switching signals.The sensor is from the original German-imported RG brand and operates based on the principle of the constant-current method of the film-covered three (dual) electrodes. It has the characteristics of anti-interference and anti-pollution.Application Fields:Tap water: 0 - 2mg/LSewage treatment: 0 - 20mg/LSeawater: conductivity as high as 200mS/cm, etc.Functional FeaturesStandard-equipped with imported sensors, ensuring accurate measurement and stable performance.One-key calibration, historical data recording and export.Standard MODBUS RTU communication protocol.Dual high-impedance pre-amplifiers: High input impedance, noise-proof, and strong anti-interference ability.Stable zero-point. Only one-point calibration is required on-site, and multiple calibration methods are also provided.Human-machine interaction: Menu-based operation structure, allowing users to operate following on-screen prompts.Multi-parameter display on the same screen: Simultaneously display the main measured value, pH value (optional), current output, and working status.Two-way output signals: The software can select from three output modes: 4-20mA / 20-4mA / 0-20mA.Free setting of the measurement range and alarm upper and lower limits; High and low limit over-range alarm prompts.Three sets of relay control switches with an adjustable hysteresis control range.Self-set password: Users can set or modify passwords to avoid misoperation.Technical ParametersSpecificationDetailed informationMeasurement ParametersChlorine, pH (optional)Measuring Ranges0.005～0.500mg/L; 0.005～2.000mg/L; 0.05～5.00mg/L; 0.05～10.00mg/L; 0.05～20.00mg/LLower Limit of Measurement0.005mg/LResolution0.001～0.01mg/L (depending on the measuring range)Accuracy (@25℃, pH 7.2)0-1ppm: ±2% of measured value or ±0.03ppm (larger one); 1-2ppm: ±2% or ±0.03ppm; 0-10ppm: ±2% or ±0.3ppm; 10-20ppm: ±5% or ±0.5ppmResponse timeT90≈3 minutesDriftApprox. -1% per month (after calibration at 25℃ and pH=7.2)PH range4.0 - 12.0 (depending on the electrode)Maintenance Cycle≥90 daysConductivity range10μS/cm～200mS/cmDisplayLCD liquid-crystal screenData StorageAutomatic storage, data protection in case of power failure, up to 110,000 pieces of dataPower supply105～235VAC±10%, 50±1Hz / 9-36VDC (DC is optional)Power≤3W (including the sensor)Analog OutputTwo-way analog output, 4-20mA / 20-4mA / 0-20mA (load resistance < 500Ω)Digital outputRS485 interface, MODBUS RTU protocolRelay outputThree-way relay 3A 250VAC; 3A 28VDC or 120VACMaterialPowder-coated steel plateSize300*250*165mm (H*W*D)Weight6kgWaterway interface2-inch or 3-inch hose (custom made)Flow rateIn flow chamber: 250～500mL/minProtection levelIP43Water pressure≤6 bar (matching a pressure-reducing valve with the instrument)Working humidity<90%, no condensationWorking temperatureInstrument: 0℃ - 55℃; Water temperature: 0.1℃ - 45℃Storage temperatureInstrument: -20°C～60°C; sensor: 0.1°C～55°CFAQ – Frequently Asked QuestionsProducts are designed and manufactured in China, following international quality standards and certified processes.OEM/ODM services and private labeling are available for international clients.Products comply with CE, RoHS, and other international certifications.Fast and reliable delivery via major international couriers.Product samples are available before bulk orders.Standard products ship within 5–7 days after order confirmation; customized products may take longer.24/7 technical support, product guidance, and warranty service are provided.Remote technical assistance, English manuals, and prompt solutions for international clients.Orders can be placed via email or website inquiry with professional guidance.Over 30 years of manufacturing experience, advanced technology, strict quality control, and global customer service.Characteristics / Technical SpecificationsModel: W771-DCP4.0Sensor: German-made CP4.0Measurement: Chlorine, pH (optional)Measuring range: 0.005–20.00mg/LResolution: 0.001–0.01mg/LAccuracy: ±2% or ±0.03ppm (0–2ppm), ±5% or ±0.5ppm (10–20ppm)Response time: T90≈3 minMaintenance cycle: ≥90 daysDisplay: LCDAnalog output: 4-20mA / 20-4mA / 0-20mADigital output: RS485, MODBUS RTURelay output: 3-way relayMaterial: Powder-coated steel plateSize: 300*250*165mmWeight: 6kgProtection: IP43Power: ≤3WPower supply: 105–235VAC±10%, 50±1Hz / 9–36VDC