How to use the ph meter
First, the preparation work before using the ph meter
1. Clean the electrode with triple distilled water before using the pH meter, and be careful not to break the glass electrode.
2. Prepare to put the NAOH solution and HCL solution for adjustment next to the platform pH meter.
3. Take out the fixed pH solution (PH=7.0) in the refrigerator and put it on the platform.
4. Turn on the pH meter, adjust the pH value, press the ︿﹀ key to select the PH and CAL options, select the CAL item, adjust and insert it into the PH solution (PH=7.0), press the " " key to select the data value to 7.0, A small octopus can appear.
5. Insert the glass electrode into the solution to be tested, then put in another electrode, and stir the liquid properly (note: do not break the glass electrode).
6. When using the electronic unit of the pH meter, attention must be paid to the protection of the circuit. When the pH value is not measured, the input of the pH meter should be short-circuited to avoid damage to the pH meter.
7. The glass electrode socket of the pH meter must be kept clean, clean and dry, and must not be exposed to harmful gases such as salt spray and acid fog. At the same time, it is strictly forbidden to have any aqueous solution on the glass electrode socket to avoid high input impedance of the pH meter.
8. Be careful to add NAOH solution and HCL solution when the pH value you need is not reached.
9. Be careful not to exceed the required fixed volume when adding liquid.
2. How to use the ph meter_How to use the ph meter (steps)
1. Open the back cover and insert a battery.
2. Install the composite glass electrode Note:
(1) The lower end of the composite electrode is a fragile glass bulb, so be careful when using and storing it to prevent it from colliding with other items.
(2) There is a KCl saturated solution in the composite electrode as a conductive medium. If the result of drying up is inaccurate, you must observe whether there is any liquid at any time. If there is a small amount left, go to the laboratory for perfusion.
(3) No pollution, including water droplets, is allowed at the instrument interface of the composite electrode.
(4) The composite electrode connection cannot be forcibly pulled to prevent the line connector from breaking.
3. After turning on the power switch, switch to the PH measurement file.
4. Measure the temperature of the PH6.86 standard solution with a thermometer, and then adjust the temperature compensation knob of the PH meter to the measured temperature value.
5. Rinse the composite electrode with deionized water and dry it with filter paper.
6. Pour 2-5ml of the PH6.86 standard solution into a plastic beaker that has been washed and dried with water, pour it out after washing the beaker and the composite electrode, then add 20ml of the pH6.86 standard solution into the plastic beaker, and insert the composite electrode In the solution, use the instrument positioning knob to adjust to a reading of 6.86 until it stabilizes. The following two points should be noted:
(1) The bit must be adjusted with the PH6.86 standard.
(2) After the adjustment, the positioning knob must not be moved again.
7. Wash the composite electrode with deionized water, dry it with filter paper, measure the temperature of the PH4.00 solution with a thermometer, and adjust the temperature compensation knob of the instrument to the measured temperature value.
8. Pour 2-5ml of PH4.00 standard solution into another plastic beaker, wash the beaker and composite electrode, then pour it out, then add 20ml of PH4.00 standard solution, insert the composite electrode into the solution, after the reading is stable, use the slope knob to Adjust to pH 4.00. It should be noted that after the slope knob is adjusted, it must not be moved again.
9. Use a thermometer to measure the temperature of the liquid to be tested, and adjust the temperature compensation of the instrument to the measured temperature.
10. Insert the composite electrode into the solution to be tested, and read the pH value, which is the pH value of the solution to be tested. The following two points should be noted:
(1) The temperature should not be too high during the measurement. If the measurement result is inaccurate over 40°C, take it out with a beaker and cool it slightly.
(2) Avoid contacting the composite electrode with organic matter, and clean it with anhydrous ethanol once contacted or contaminated.
