pH Tester Calibration Procedure

1. Range of application

This technical document specifies the calibration of pH tester with glass electrodes of (0-14) pH in measuring range and accuracy of at least 0,02 pH

2. Calibrating techniques

- Outside check

- Technical check

- Measurement check

3.1 Standard measuring instrument (s)

Technical Calibration Buffer:

- Range of measurement: (0-14) pH

- Measurement Uncertainty: ≤ 0.01 pH

3.2 Other measuring instrument (s)

Heated Digital Water Bath:

- Range of measurement: (+5 ÷ 99) °C

Standard Humidity, Temperature Meter

- Range of measurement: (-20 ÷ 70) °C

- Accuracy:

  ± 0.2 °C (10 ÷ 40 °C)

  ± 0.4 °C of the remaining

  ± 1%RH (10 ÷ 90) %RH 

  ± 2.0 %RH (of the remaining)

Hygro-Thermometer

- Range of measurement: (0 ÷ 50) °C

- Accuracy: ±0.5 °C

- Range of measurement: (10 ÷95) %RH

- Accuracy: ±3%RH

3.3 Auxiliary Instrument(s)

- Distilled water

- Sprayer

- Tissue, glass cup

4. Conditions for Calibration

Temperature: (25 ± 2) °C

Humidity:  80 %RH

The temperature, as well as the humidity, must be recorded before and after calibration

8. General handling

a. The calibrated pH tester is stamped, certified in paper along with calibration results, and measurement uncertainty.

b. The recommended calibration cycle of pH tester is 12 months.

9. About EMIN's Calibration - Verification - Repair center

EMIN Vietnam’s Calibration and Verification center has been established since 2020 to provide after-sales services. The Calibration and Verification center is thoroughly equipped with technical equipment, followed by the assistance from various equipment manufacturers around the globe. At the center, calibration of specialized equipment is successfully carried out by experienced engineers in EMIN Vietnam, ensuring fast, accurate, reliable procedure to meet the most demanding customers’ requirements). Such technical capacity can only be performed by very few technology businesses in Vietnam. Meanwhile, after tireless effort, the Calibration and Verification center of EMIN Vietnam is officially certified to be accredited by the ISO 17025 standard (Jan, 2021)

If you want your instruments calibrated, please contact:

Equipment Verification - Calibration - Repair Service Center - EMIN Vietnam JSC 

Address: No 203 Nguyen Ngoc Vu Street, Trung Hoa Ward, Cau Giay District, Ha Noi City

Email: services@emin.vn - Hotline: 0968.060.220

Further information about pH tester calibration service can be found here.