List of Qualified Five-Parameter Water Quality Online Automatic Monitoring Instruments for Applicability Testing

List of Qualified Five-Parameter Water Quality Online Automatic Monitoring Instruments for Applicability Testing (As of December 31, 2021)

This list summarizes five-parameter water quality online automatic monitoring instruments that passed applicability testing as of December 31, 2021, covering monitoring equipment for five routine parameters: pH, dissolved oxygen, turbidity, conductivity, and temperature. The list information includes unit name, instrument name/model, and report number, for reference in selection by engineering technicians and procurement personnel.

Overview of Qualified List

The following is the qualified product information of all 67 units, arranged in order of report number. Report numbers start with 质（认）字, representing the certification mark for passing applicability testing.

Significance of Applicability Testing and Selection Recommendations

Applicability testing is a performance evaluation of online monitoring instruments according to national environmental protection standards. Products that pass the testing demonstrate that they meet the measurement requirements for the five parameters: pH, dissolved oxygen, turbidity, conductivity, and temperature, and have reliability and stability. When procuring, it is recommended to prioritize products listed in this list.

Selection Considerations

• Validity of report number: Confirm that the report number is within its validity period to avoid selecting products with expired certification.
• Parameter coverage: Ensure that the instrument model explicitly covers five parameters; some models may require optional sensors.
• Brand and service: Consider the manufacturer's technical support and after-sales service capabilities, and prioritize brands with good market reputation.
• Application scenario: Select the appropriate protection rating and installation method according to the monitoring environment (e.g., rivers, sewage treatment plants, drinking water sources).

Frequently Asked Questions

• Q: Is the report number in the list permanently valid?
  A: Report numbers usually have a validity period and require periodic review. It is recommended to confirm the latest status with the supplier before procurement.
• Q: Can the five-parameter monitor be expanded with other parameters?
  A: Some models support expansion with parameters such as COD and ammonia nitrogen, but it is necessary to ensure that the expanded instrument still meets applicability requirements.

This list is a summary of qualified products as of December 31, 2021. For subsequently added products, please follow official updates. Proper selection can effectively improve the accuracy and compliance of water quality monitoring systems.