Difference between pH electrode and common electrode for pur

Difference between pH electrode and common electrode for pure water

 

Core tip: the liquid level of pH electrode is 10 mm below the injection inlet. If necessary, check the amount of electrolyte. 3mol / KCl solution can be added and the sample will be polluted by KCl solution in the electrode. In order to prevent carbon dioxide in the air from polluting the sample and reducing the measurement value, the primary influencing factors of pure water pH electrode are as follows: the measurement point must be in the bypass system and the medium can be discharged. Due to the reference system of the electrode, the operation needs a stable and low pressure。

The liquid level of pH electrode is 10 mm below the injection inlet. If necessary, check the amount of electrolyte. 3mol / KCl solution can be added and the sample will be polluted by KCl solution in the electrode. In order to prevent carbon dioxide in the air from polluting the sample and reducing the measurement value, the primary influencing factors of pure water pH electrode are as follows: the measurement point must be in the bypass system and the medium can be discharged. Because of the reference system of the electrode, the operation needs a stable and low pressure. It is necessary for the sample to be a sealed flow-through sheath and have excellent shielding function (such as stainless steel) to prevent the influence of electric disturbance and potential. Membrane impedance, because the measured impedance is very high and easy to be disturbed, so it is necessary to connect the cable from the sensor to the transmitter, and the shielding function is very good. The flow rate of the sample must be low and stable, because the electrostatic effect will occur when the flow rate is too high. It is necessary to have a reserved channel to separate the KCl in the reference electrode from the sample, so as to avoid the influence of KCl on the measurement. It is necessary for the preamplifier of transmitter to supply high impedance input temperature for glass electrode and reference electrode together。

 

Please check the pH sensitive film of the electrode carefully when opening the package. Barrier (Teflon / glass grinding) and mechanical damage of vitreous body. In case of the above damage, please return the electrode to the company or local distributor in the original box, and indicate the invoice number。

 

Then rotate the sealing cover of the reference electrolyte upward to remove the sticker on the electrode filling port. After reaching the position shown in the figure, rotate the sealing cover to ensure that the pressure in the electrode is balanced with the ambient pressure. At the end of operation, rotate the sealing cover until the sealing cover is clear。

 

Move the electrode steeply to the winding direction to prevent bubbles in the pH sensitive glass bulb. If there are bubbles, swing the electrode downward to drive them away. If the temperature sensor needs to be used, the BNC connector at one end of the electrode cable should be inserted into the corresponding interface of the pH meter, which should also be connected together. Then gently dry it with a tissue. Don't conflict with sensitive membrane to prevent adding echo time. Remove the liquid container and clean the electrode glass film with distilled water。

 

Otherwise, the life of electrode will be shortened. PH electrode which is dry for several days must be immersed in proper storage solution for several hours before use. We suggest that the composite electrode be immersed in 3mol/lkcl solution. Electrodes cannot be stored in dry storage or immersed in distilled water. Then wash with distilled water and soak in the storage solution for 6 hours. Long time dry deposit sensitive film can be activated by hydrofluoric acid solution: immerse sensitive film in solution for 1 minute。