North & Central America US   
What are pH Measurement and Calibration Best Practices?

What are pH Measurement and Calibration Best Practices?

Video FAQ

What are pH Calibration Best Practices?

Why is pH calibration important?

  • Compensates for process effects on the pH glass and reference sensor

Best Practice Steps

  1. Soak sensor in 5-10% HCl for 5-10 min thoroughly rinse after soaking (NOTE: DO NOT Soak with demineralized water)
  2. Ensure correct buffer table (i.e. N.I.S.T. or Technical) are being referenced in the electronics
  3. Always use a fresh buffer solution. Never reuse old solutions

Calibration Best Practices

  1. Always do a two-point calibration
  2. Always start with the 6.86/7.0 pH buffer first to zero the sensor out
  3. pH 4.01/4.0 is recommended being the 2nd choice as it is the most stable
    • If measuring in the caustic range you can do a spot check with the 9.18/ 10 buffer solution

How Long Between Calibrations?

  • Once a month
  • More frequent calibration could indicate:
    • Increased frequency of cleaning is needed or  
    • The wrong reference system is used in the application

 

For immediate assistance or to ask your own question, please use the chatbox to the right, contact us at support@us.yokogawa.com, or 1.800.888.6400

Industries

  • Chemical

    Chemical plants rely on continuous and batch production processes, each posing different requirements for a control system. A continuous process calls for a robust and stable control system that will not fail and cause the shutdown of a production line, whereas the emphasis with a batch process is on having a control system that allows great flexibility in making adjustments to formulas, procedures, and the like. Both kinds of systems need to be managed in available quality history of product, and to be able to execute non-routine operations. With its extensive product portfolio, experienced systems engineers, and global sales and service network, Yokogawa has a solution for every plant process.

    See More

  • Food & Beverage

    The food and beverage industry must produce safe, high-quality foods and beverages for consumers. In addition to quality control, the manufacturing processes include many challenges such as managing ingredients, improving efficiency and handling global environmental issues. Yokogawa leverages its decades of technological expertise to help customers build and operate the ideal factory.

    See More

  • Pulp & Paper

    The paper and pulp industry is highly competitive and must meet ever-changing market needs. Yokogawa helps realize energy-efficient plants which are globally sustainable.

    See More

Related Products & Solutions

Top