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Published June 24, 2024 7:53am

Verification and Calibration Activities for Automated, Continuous Wastewater Monitoring Station


Given the stringent requirements for verifying and calibrating verifying and calibrating measuring devices as per Circular No. 10/2021/TT-BTNMT and Circular No. 06/2017/TT-BKHCN, installing an automated and continuous wastewater monitoring system has become essential. Việt An Enviro introduces the 3101 WW automated, continuous wastewater monitoring solution with self-operating capabilities, high flexibility, and multiple module options to meet this need. This solution not only helps businesses comply with legal regulations but also saves costs and improves wastewater quality management.

Automatic wastewater monitoring station
iMisff 3101 Automated Wastewater Monitoring Station

What is Verification?

Verification is a measurement control measure by designated organizations to assess and confirm that measuring instruments meet metrological technical requirements. This is a mandatory legal condition for measuring devices that must be verified before being put into operation and periodically during use.

The verification cycle is specified in Circular 23:2013/TT-BKHCN. For environmental water monitoring devices, the equipment requiring verification includes:

  • pH meters
  • Total Dissolved Solids (TDS) meters
  • Phương tiện đo độ dẫn điện (EC)
  • Electrical Conductivity (EC) meters
  • Dissolved Oxygen (DO) meters
  • Oxidation-reduction potential (ORP) meters
  • Residual Chlorine meters, etc.

The verification process involves using certified reference materials or standards to re-measure within the device's measurement range. The measurement results must fall within the allowable error range. If the device meets the requirements, it will be tagged, and a verification certificate will be issued. If it fails, the verification organization will require the user to repair or recalibrate the device for re-verification.

The Directorate for Standards, Metrology, and Quality evaluates and authorizes verification organizations to carry out these activities.

kiểm định thiết bị
Periodic Device Verification

What is Calibration?

Calibration involves technical activities to ensure the device or measuring instrument provides accurate measurement values. It is a regular activity that users must perform to maintain the device's accuracy, as it may deviate due to various objective and subjective factors during use.

For example, a scale that has been verified and tagged may still require the user to zero it before weighing, as the zero-adjustment knob might drift during movement. Adjusting the scale to zero is a calibration action.

Similarly, the calibration procedure is more complex for other physicochemical measuring devices and must follow strict manufacturer guidelines. Typically, standard substances are used to establish calibration curves (correlating standard concentrations with physical quantities measured by the device, such as current intensity, voltage, counts, optical density, etc.) or calibration equations y=f(x) for the parameters to be measured. The manufacturer usually recommends the calibration cycle.

During the device's use, users must re-check accuracy by measuring with reference materials or standards. If the error exceeds the permissible limit, the device must be recalibrated.

Thus, verification and calibration of measuring devices and monitoring equipment are two different but necessary processes to ensure accuracy and compliance with metrological technical requirements.

Device Calibration Activities
Device Calibration Activities

Automated Water Monitoring Devices Will Be Verified and Calibrated Before Delivery

Viet An Enviro ensures that devices for automated and continuous wastewater monitoring stations are thoroughly verified and calibrated before delivery to customers. This ensures that the equipment always operates accurately and meets all technical requirements.

To support customers, Viet An Enviro not only provides equipment but also offers technical guidance and training for system operators. We help partners master simple and accurate calibration procedures, ensuring the devices are always in optimal condition during use.

Additionally, Viet An Enviro supplies genuine calibration solutions and standards for each automated water monitoring device. This makes it easy for customers to replace and maintain the equipment when necessary, ensuring the system always operates stably and efficiently.

Xem chi tiết: Giải pháp pháp quan trắc nước thải tự động, liên tục – iMisff 3101 WW

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