Qiwei PHS-3C ph Tester, desktop microcomputer

PHS-3C

pH Meter (desktop microcomputer)

Introduction

Qiwei PHS-3C (desktop microcomputer) ph Tester can measure the pH value with an accuracy of 0.01pH and a temperature accuracy of ±1°C. The microcomputer ph Tester is a touch button, and the temperature compensation is performed manually, and the calibration solution can be automatically identified. It is suitable for precise measurement of the acidity (pH value) and electrode potential (mV) of the solution in the laboratory.

Instructions

1. Preparation before use

(1) Plug the power adapter into the 220V AC power supply, and plug the DC output plug into the power jack on the rear panel of the PHS-3C PH meter . 

(2) Install the electrode on the electrode holder, remove the short-circuit plug on the electrode socket of the pH meter, and plug in the electrode.

Note that the electrode plug should be kept clean and dry before use, and avoid contamination.

(3) After turning on the power, press the power button, preheat for about 5 minutes before calibration.

2. PH meter calibration

Professional calibration is required before using the pH meter. The PHS-3C  pH meter uses three standard buffer solutions of 4.00, 6.86, and 9.18 for calibration. The standard buffer solutions used must be accurate and reliable to ensure the accuracy of subsequent measurement results.

1) Plug in the power supply and press the "Switch" button to turn on the machine. Unscrew the short-circuit protective cover on the pH socket of the PHS-3C pH meter , connect it to the plastic shell pH composite electrode, wash the electrode in pure water and dry it. Use a thermometer to measure the temperature of the pH buffer solution, and press the increase key "∧" or the decrease key "∨" to adjust the temperature value accurately. 

2) Positioning calibration. Immerse the pH electrode in the pH6.86 buffer solution, stir it slightly, and then place it still. After the measured value is stable, press and hold the "calibration" button. When the CAL symbol is displayed on the LCD, release the "Calibration" button , the flashing 6.86 will be displayed first, the End symbol will be displayed after a few seconds, and then the pH calibration value will be displayed (the pH value displayed at this time varies with the temperature, for example, 25°C It will display 6.86 at 15°C, and 7.04 at 15°C. These are the values set in the chip, the same below). Indicates that calibration is completed and memorized.

3) Perform slope calibration I/ calibration II successively. Where calibration I uses pH 4.00 buffer and calibration II uses pH 9.18 buffer . Operation method: Take out the pH electrode, wash it with pure water and dry it, then immerse the pH electrode in the pH4.00 ( pH9.18 ) buffer solution, stir it a little and then place it still. After the measured value is stable, press and hold " Hold down the "Calibration" key, and release it when the CAL symbol is displayed on the LCD, the flashing 4.00 ( 9.18 ) will be displayed first, the End symbol will be displayed after a few seconds, and then the pH calibration value will be displayed, indicating that the calibration is completed and memorized. After the calibration is completed, the slope percentage of the electrode in the linear segment will be automatically displayed.

Calibration instructions: Built-in smart chip, can use one-point, two-point or three-point automatic calibration, if the measurement accuracy is ≤0.1pH, just use a pH buffer solution for one-point calibration; if the measurement range is only in the acidic range (≤7pH ), you can choose pH7 and pH4 calibration; if the measurement range is only in the alkaline range (≥7pH), you can choose pH7 and pH10 calibration; Point calibration, which will make the measurement accuracy higher. For the pH electrode used for the first time, three-point calibration is required to adjust the slope of the instrument to be consistent with the pH electrode.

3. Measure the pH value of the solution

Use a thermometer to measure the temperature of the solution, then press the increase key ∧ or decrease key ∨ to adjust the temperature value of the instrument accurately, wash the pH electrode with pure water and dry it, then immerse it in the solution to be tested, stir it slightly and place it still, When the measured value is stable, the reading is the measured pH value.

Note: The closer the temperature of the measured solution is to the temperature of the calibration solution, the higher the measurement accuracy will be.

4. Measure the mV value

First press the "pH/mV" key to switch the "mV" file. Connect the ORP electrode or ion electrode (need to be equipped separately) and insert it into the solution to be measured, stir it a little, then place it still, and read it after the measured value is stable, which is the measured ORP value or the potential value of the ion electrode.

Pictures

Packing list：Host x1, Buffer reagent x3, Encasement box x1

[Note]Because the manufacturer's packaging may be updated or upgraded, the detailed packaging list shall be subject to the latest standard configuration of the manufacturer.