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- ºê·£µå À̸§: SHENGMEIYU
- ¿ø»êÁö: Áß±¹
- Sale Item: Drop shipping wholesalers
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This version has no backlight, please contact customer service if you need a backlight version. ) 1. Instructions for PH pH meter calibration powder: pH meter calibrator: the pH standard solid substance. It can be used after opening the package and adding water. Suitable for calibration of any type of pH meter. Two specifications are pH=4.00; 6.86 and valid for five years. There are two specifications of PH pH standard solution for preparing powder, 4.01 and 6.86, and each pack can prepare 250ML standard solution. (Be sure to add water in the required proportion, otherwise it will affect the accuracy of the calibration and increase the error) Note: (PH pens have been calibrated before delivery, buyers do not need to re-calibrate after receiving the goods! In the following cases, the pH meter must be re-calibrated, and it has been used (or placed) for a long time after calibration; the electrode is used Especially frequent; measurement accuracy requirements are relatively high.) 2. How to use: Cut open the plastic bag, pour the powder into a 250ML volumetric flask, rinse the inner wall of the plastic bag with a small amount of CO2-free distilled water, and dilute to the mark and shake well. The shelf life of the powder is 2 years. As long as the calibration solution is not contaminated, it can be reused. The shelf life after adding water is about 6 months. After the calibration powder is converted into calibration solution, follow the steps below¡é How to use the calibration solution: Wash the pH meter electrode with pure water (2-3 times) 1. Immerse the pH electrode in a mixed phosphate standard buffer solution with a pH value of 6.86 (25°C), and shake gently. 2. Use a small screwdriver to adjust the calibration potentiometer until the displayed value matches the pH value of the standard buffer solution at ambient temperature. 3. Rinse the electrode with pure water first, and then insert the electrode into the standard buffer solution of potassium hydrogen dicarboxylate with pH 4.00 for calibration. 4. After about two minutes. The displayed value should be within the allowable error range compared to the pH value of the buffer solution. The so-called two-point calibration is to use two kinds of calibration solutions, and the three-point calibration is to use three kinds of calibration solutions. generally Begin to calibrate from 6.86. And then using 4.00. 3. Operation steps: 1. Remove the protective cover. 2. First clean the electrode of the pH meter with distilled water. And wipe the electrode dry with filter paper. 3. Turn on the switch located on the battery compartment. 4. Insert the pH meter into the liquid to be tested until the liquid is immersed to the "immersion line", if conditions permit, the solution can be immersed to a level slightly higher than the "immersion line". line" position. 5. Gently stir the solution and wait for about two minutes. Read the displayed value. 6. Finished use. Clean the electrodes. Turn off the switch. Put on a protective case. 4. Standard configuration One PH pen, three packs of powder Precautions: Please note that the PH pen probe is a glass product and is fragile. Please do not bump it with objects. Once damaged, it cannot be replaced. To protect the probe well, use absorbent paper to gently blot the water on the probe after use. Battery installation: If the brightness of the backlight decreases significantly or the displayed value is blurred, the battery should be replaced. When replacing the battery, pull out the battery compartment to replace it. Note battery polarity.
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