For full functionality of this site it is necessary to enable JavaScript.
EMIN.VN
0

pH Tester Calibration Procedure

2021年04月26日 13時50分20秒

**1\. Range of application** This technical document specifies the calibration of pH tester with glass electrodes of (0-14) pH in measuring range and accurac

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. Calibrating instruments

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

5. Prepare for Calibration
Prior to the calibration, the following preparations must be done:
- Prepare the Technical Calibration Buffer
- Place the pH tester and Technical Calibration Buffer in the calibration room at least 1 hour prior to calibration. 
- The Technical Calibration Buffer must be kept at constant temperature at least 1 hr at (25 ± 0,2) 0C in Heated Digital Water Bath
- Prior to calibration, immerse the pH tester electrode with distilled water at least 3 hrs in the lab.
Before measuring the pH level of Technical Calibration Buffer, the followings must be met:
- Clean the pH tester’s electrodes with distilled water.
- Dry the electrode with tissue.
The pH tester to be calibrated must be operating at least 15 mins prior to calibration.

6. Begin the calibration
6.1 Outside Check
6.2 Technical Check
6.3 Measurement Check
A pH tester is checked and measured according to the following content, method and requirements:
- Calibrate the pH tester according to the manufacturer's technical documents.
- Check the error with standard pH solutions
- Measure at least 3 times for each pH standard solution. Record the measured results in the record.
- Calculate the error

7. Measurement Uncertainty Evaluation

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.


関連ニュース

SiC/GaN Semiconductor Material Trends: From Materials Research to In-Depth Failure Analysis
2026年10月24日 09時59分14秒
SiC/GaN Semiconductor Material Trends: From Materials Research to In-Depth Failure Analysis

As we enter the 2026–2030 period, wide-bandgap (WBG) semiconductor materials such as Silicon Carbide (SiC) and Gallium Nitride (GaN) are transforming the power electronics, electric vehicle (EV/HEV), renewable energy, and AI data center industries. The shift from traditional silicon to SiC and GaN enables higher power density, smaller passive components, and improved overall system energy efficiency.

Chauvin Arnoux C.A 6117 Multifunction Electrical Installation Tester
2026年10月23日 15時26分05秒
Chauvin Arnoux C.A 6117 Multifunction Electrical Installation Tester

An all-in-one testing solution that complies with the international standard IEC 60364-6. It features a 5.7-inch color graphical display, supports Type B RCD testing, includes memory for 1,000 measurements, and is equipped with a Lithium-ion battery providing 30 hours of continuous operation

Plastic Products with Color Streaks: How to Adjust Back Pressure and Screw Speed? How Should Color Be Measured to Verify Proper Adjustment?
2026年10月21日 15時30分17秒
Plastic Products with Color Streaks: How to Adjust Back Pressure and Screw Speed? How Should Color Be Measured to Verify Proper Adjustment?

In the middle of the night shift, a batch of light-gray plastic emerged, streaked with debris. The machine operator took one look and did what came most naturally: he cranked up the screw speed and increased the back pressure to ensure the orange-colored pellets melted completely. By morning, the color was indeed more uniform. A few weeks later, the customer returned the entire shipment the products had become brittle, cracking at the slightest impact, and the color varied from one delivery to the next, failing to match the approved standard

お得な情報を受け取る

数量割引、まとめ買い価格の更新、新製品情報をメールでお届けします。

登録することで、当社の利用規約およびプライバシーポリシーに同意したものとみなされます。

クイックサポート

認定専門家へ直接アクセス