pH meter correction
1. Turn on the power supply and press the pH key to activate the instrument. Allow the device to warm up for at least 30 minutes to ensure the zero point stabilizes. The indicator light will confirm that the system is active and ready for use.
2. Insert the glass electrode into the corresponding socket and connect the calomel electrode lead to its terminal. Ensure all connections are secure to avoid any interference during measurements.
3. Adjust the temperature compensation setting by rotating the temperature compensator dial to match the actual temperature of the solution you are measuring. This ensures accurate readings under varying temperature conditions.
4. Perform a zero adjustment by setting the step switch to "6" and turning the zero adjuster until the pointer aligns with the center of the scale, marked as "1". This step ensures the meter is calibrated correctly before proceeding.
5. Proceed to the calibration stage by switching the step switch to "Correct" and adjusting the correction dial until the pointer reaches the full scale at "2.0". This step is crucial for ensuring accurate pH readings.
6. Repeat steps 4 and 5 several times if necessary until the reading becomes stable and consistent. This helps eliminate any residual errors caused by environmental factors or electrode instability.
7. Prepare the standard buffer solution at the same temperature as the one used for calibration. Pour the buffer into a small beaker, place it on a magnetic stirrer, and immerse the electrode. Turn on the stirrer, set the step switch to the known pH value of the buffer, press the reading switch, and adjust the positioner until the pointer stabilizes at the correct pH value for that temperature. After this, release the reading switch, remove the solution, rinse the electrode thoroughly with distilled water, and gently blot the excess moisture with filter paper.
8. Finally, immerse the electrode in the solution you wish to measure. Press the reading switch and adjust the step switch to find the appropriate range. The final pH value is determined by adding the indication from the step switch to the reading on the pointer. Always record the result and clean the electrode after each measurement to maintain accuracy for future use.
This process ensures precise and reliable pH measurements, especially when working with sensitive solutions or in laboratory environments where accuracy is essential.
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