Turbimax CUS51D Calibration Overview

Turbimax CUS51D is a sensor used for continuous turbidity measurement, widely applied in water treatment, chemical, and pharmaceutical industries. Regular calibration is key to ensuring its measurement accuracy. This guide will introduce the complete calibration process to help you operate correctly.

Before calibration, prepare standard solutions, cleaning tools, and a calibration record sheet. Ensure the sensor installation location is convenient for operation and the ambient temperature is stable.

Pre-Calibration Preparation

Required Tools and Materials

  • Standard turbidity solutions: such as formazin standard solutions (0 NTU and 1000 NTU)
  • Cleaning supplies: soft cloth, deionized water, mild detergent
  • Calibration container: clean, scratch-free glass or plastic cup
  • Record sheet: used to record calibration data

Environment and Safety

  • Ensure the sensor is powered off or in maintenance mode
  • Avoid direct strong light to prevent bubble interference
  • Wear gloves and safety goggles, and follow on-site safety regulations

Calibration Steps

Zero-Point Calibration (0 NTU)

  1. Remove the sensor from the process pipeline and rinse it thoroughly with deionized water.
  2. Gently dry the sensor optical surface with a soft cloth to avoid scratches.
  3. Immerse the sensor in 0 NTU standard solution, ensuring the measurement window is fully submerged and free of bubbles.
  4. Select the "Zero-Point Calibration" menu on the transmitter and wait for the reading to stabilize.
  5. Confirm the calibration and record the zero-point value.

Slope Calibration (1000 NTU)

  1. Remove the sensor, rinse it with deionized water, and then dry it.
  2. Immerse the sensor in 1000 NTU standard solution, also ensuring no bubbles.
  3. Select the "Slope Calibration" menu on the transmitter and wait for the reading to stabilize.
  4. Confirm the calibration and record the slope value.

Post-Calibration Verification

  1. Reinstall the sensor into the process, or use a third standard solution (such as 100 NTU) for verification.
  2. Compare the measured value with the standard value; the error should be within the allowable range (usually ±2%).
  3. If the error is too large, repeat the calibration or check whether the sensor is contaminated.

Calibration Parameters and Precautions

Item Recommended Value/Requirement
Zero-point standard solution 0 NTU (deionized water or dedicated standard solution)
Slope standard solution 1000 NTU formazin
Calibration interval Recommended once every 1-3 months, depending on operating conditions
Allowable error ±2% or ±0.02 NTU (whichever is greater)
Temperature range 0-50°C (calibration solution and sensor temperature should be consistent)

Common Problems and Solutions

  • Unstable reading: Check for bubbles or dirt, and clean again.
  • Calibration failure: Confirm the standard solution has not expired and the sensor is not damaged.
  • Persistently large error: The standard solution may need to be replaced or the sensor returned for repair.

Summary

Regular calibration of the Turbimax CUS51D is a necessary measure to ensure turbidity measurement accuracy. Following the above steps, using qualified standard solutions, and recording calibration data can effectively extend sensor life and meet compliance requirements.

For a more detailed video demonstration, please refer to the video content above.