How to calibrate a pH meter?
Calibration method – pH electrode
Choose two buffers that cover the expected pH of the sample. More buffers can be used for greater accuracy in the pH range. For best accuracy, use buffers that are not separated by more than 3 pH units.
Step-by-step process
- Refer to the PH meter manual for specific details on the performance of your pH meter.
- Remove the electrode and rinse with distilled water. To remove excess water, wipe the electrode with a paper towel and place the electrode in the first pH 7 buffer.
- Calibrate the pH meter to read the corrected temperature value from the first buffer.
- Rinse the electrode as before and place it in the second buffer. To read, you have to wait a while for the transmitter to calculate the pH meter, then read the modified value of the second buffer.
- Wash the electrode as before. Insert the electrode into the sample and wait for a stable reading. Adjust the pH and temperature of your sample
Tips on pH meter / electrode calibration
- Always use fresh pH buffers
- The electrode calibration slope should be 95-102%
- Detach the electrode filling solution cap to ensure a uniform flow of the filling solution
- Between measurements, rinse the electrode with distilled water and then measure with the next sample
- Stir all buffers and samples continuously.
- Put some insulation between the mixer and your sample to prevent your sample from heating up
- Do not rub or wipe the electrode lamp
- Protect your pH electrode properly.
Rose Calibration Company in Melbourne, Australia with over ten years of experience provides all calibration, maintenance, and repair services throughout Australia. If you live in Sydney, Melbourne, Adelaide, Perth, Geelong, and Brisbane, you can receive your quote in less than two hours by fill-up the form via the “Booking” link.
