Operating procedures for portable pH meters
1. Before using a portable pH meter for the first time or for a long time, carefully read this operating procedure** PH electrodes that have been used or discontinued for a long time must be soaked in a 3mol/L potassium chloride solution for 24 hours before use. Portable pH meters must be connected to the pH (Q9) short-circuit plug without electrodes. The normal working environment temperature of a portable pH meter is 5~35 ℃, with a calibration temperature of 0.0~60.0 ℃ and a measurement range of 0.00~14.00PH, -1800~1800mv, and -5~105 ℃.
2. Balance the temperature of the buffer solution to room temperature.
3. Measure the temperature of the test solution (if necessary), roughly measure the pH value of the test solution, and select two suitable buffer solutions to calibrate the electrode.
4. Remove the electrode protection sleeve, put the electrode into the buffer solution, press the "ON/OFF" button to turn on the device, press the "Mode/Measurement" button to confirm that the instrument is in the measurement state, and after the reading is stable, press the "Confirm/Print" button to confirm the calibration result. The measurement can only continue if the difference between the calibration value and the standard values of the two buffer solutions is within the allowable range. (Without cleaning, the electrode should not be taken out of one buffer solution and directly placed into another buffer solution or the test solution.)
When the temperature electrode is connected, the instrument adopts automatic temperature compensation without the need to set the solution temperature. When the temperature electrode is not connected, the portable pH meter adopts manual temperature compensation. At this time, press the "Mode/Measurement" button to set the temperature of the solution to be measured in the "MTC" mode.
6. Place the electrode into the solution to be tested, press the "Mode/Measure" button to confirm that the instrument is in the measurement state. After the reading stabilizes, press "Confirm/Print" to measure and print the data. Press "Mode/Measurement" to switch between mode and measurement states, or to cancel the current operation. Pressing the "▲/PH/mv" key can change the measurement unit (PH or mv), select mode, or adjust parameters.
7. Remove the electrode and clean it thoroughly, and the measurement is completed. Seal the front end of the electrode with a protective sleeve, and a small amount of potassium chloride replenishment solution should be placed inside the protective sleeve to keep the electrode bulb moist; At the same time, please move the rubber sheath on the upper part of the electrode to cover the potassium chloride dispensing hole to prevent the potassium chloride solution from overflowing.
