Traditional Culture Encyclopedia - Traditional stories - What kind of PH electrode is used to determine pure water? What's the difference between it and ordinary electrodes? Why? Please tell me.
What kind of PH electrode is used to determine pure water? What's the difference between it and ordinary electrodes? Why? Please tell me.
Because the operation of the reference system of the electrode requires constant low pressure, and the sample will be contaminated by KCL solution in the electrode. 2) In order to prevent the pollution of carbon dioxide in the air to the sample and reduce the measured value, the sample must be sealed. 3) The circulating sheath must have good shielding performance (such as stainless steel) to prevent electrical interference and potential influence. 4) Membrane impedance. Because the measured impedance is very high and easy to be disturbed, the cable connecting the sensor and transmitter must have good shielding performance. 5) The flow rate of the sample must be low and stable, because excessive flow rate will produce electrostatic effect. 6) There must be a reserved channel to separate KCL in the reference electrode from the sample to prevent KCL from affecting the measurement. 7) The preamplifier of the transmitter must provide high impedance input for the glass electrode and the reference electrode. 8) temperature.
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