WXZJ-CODcr Series COD Online Water Quality Analyzer

WXZJ-CODcr Series COD Online Water Quality Analyzer

The WXZJ-CODcr online analyzer heats a mixture of water sample, potassium dichromate digestion solution, silver sulfate solution (added as a catalyst to more effectively oxidize straight-chain fatty compounds), and concentrated sulfuric acid to 175°C. After the dichromate ions oxidize the organic matter in the solution, the color changes. The analyzer detects this color change, converts it into a COD value, and outputs the result. The amount of dichromate ions consumed is equivalent to the amount of oxidizable organic matter.

Features of the WXZJ-CODcr Series COD Online Water Quality Analyzer:

★ Unique design, resulting in lower failure rates, lower maintenance requirements, lower reagent consumption, and higher cost-effectiveness compared to similar products.

★ Optical components: Utilizes a dual-beam system rarely used in domestic online monitoring instruments, ensuring detection is unaffected by various environmental factors. Automatically corrects system errors, improving measurement accuracy, stability, and repeatability.

★ Selection valve components: Uses original imported components from the USA, Japan, or Germany. Employs internationally mainstream fluid components with smaller dead volume and simpler operation.

★ Metering components: Achieves precise reagent measurement through a visual photoelectric system, overcoming quantitative errors caused by peristaltic pump tube wear. Enables precise micro-volume reagent dosing, with each dose仅为1--5 milliliters, significantly reducing reagent usage.

★ Sampling components: Utilizes peristaltic pump negative pressure suction, with an air buffer always present between the reagent and the pump tube, avoiding pump tube corrosion.

★ Sealed digestion components: High-temperature and high-pressure digestion system accelerates the reaction process, overcoming corrosion from volatile corrosive gases in open systems.

★ Reagent tubes: Uses imported modified transparent polytetrafluoroethylene (PTFE) soft tubes with an inner diameter greater than 1.5mm, reducing the likelihood of sample particle clogging.

★ Signal processing: Employs original imported high-precision analog-to-digital conversion chips, greatly enhancing the core board's expandability, adapting to various usage environments, and making the instrument operation simpler and more user-friendly.

★ Temperature control: Utilizes imported temperature measurement components to form a precise temperature control system, incorporating temperature compensation technology to overcome temperature drift effects and ensure sample reaction conditions better meet requirements.

★ Software advantages:

1. The entire software system framework and external facilities make human-machine interaction simpler and functional applications more comprehensive;

2. Allows real-time settings to address contamination caused by different water qualities in specific field conditions during measurement, significantly reducing instrument failure rates due to such issues and making measurement data more accurate;

3. Features an automatic calibration mode; after automatic calibration, the instrument returns to automatic mode and operates according to user-set parameters, eliminating the need for full staff monitoring, greatly reducing maintenance time, and improving maintenance efficiency;

4. Offers two measurement modes: online (automatic) and offline (manual). Offline mode uses a calibration tube for measurement without removing the sample tube from the sampling port or cup, making maintenance more convenient;

5. Can store up to 200,000 data records, with data exportable at the touch of a button;

6. Online (automatic) and offline (manual) mode data are stored independently. Offline mode data is not uploaded to the data collector, avoiding impact on uploaded data during instrument maintenance.

 Technical Parameters

★ Method basis: National standard GB11914-89 "Water Quality - Determination of Chemical Oxygen Demand - Potassium Dichromate Method."

★ Measurement range: 10-5000 mg/L COD.

★ Accuracy: ≥100mg/L, within ±10%; <100mg/L, within ±8mg/L.

★ Repeatability: ≥100mg/L, within ±5%; <100mg/L, within ±6mg/L.

★ Measurement cycle: Minimum measurement cycle is 20 minutes. Digestion time can be adjusted from 5 to 120 minutes based on actual water samples.

★ Sampling cycle: Time interval (adjustable from 20 to 9999 minutes) and整点测量模式 (整点测量模式).

★ Calibration cycle: Adjustable任意间隔任意时刻 from 1 to 99 days.