Number: 212112
Color classification: cork solution
Decoration and construction content: Installation Project
Cork liquid connection: advantages: reaction speed express, full permeation liquid, built-in filter membrane environmental protection.
Shortcomings: easy to collect environmental factors cause the damage of the cork.
Reference electrode specification: the diameter of 3cm is about 15cm.
The line length is 1.5 meters, with a clip!!!! Buy 1 small bags of crystal!
Copper sulfate reference electrode
Specification: wood core solution
1, use: the portable copper sulfate reference electrode is suitable for field use. It is mainly used to measure the natural potential and cathodic protection potential of underground metal pipelines, measure the stray current in the soil, and also can be used to measure the potential of the steel bar in the cable metal sheath and concrete. The electrode can be used as a reference electrode for the control potential in an external current cathodic protection system where the soil is more sticky. It can be used in various kinds of soil and fresh water.
2. Structure performance
(1) the size of the electrode is small, and it is convenient to carry. The cavity is made up of a transparent nylon rod, which facilitates the observation of the saturation of the internal copper sulfate solution.
(2) the electrode potential is stable, and the electrode is not easy to polarize.
(3) the electrode life is long, the electrode cap and the electrode cavity are connected by the stud, and the filling solution is convenient. One year of irrigation can be used for more than one year.
(4) the electrode structure is strong, the joint is corrosion-resistant, the leakage speed of the microporous membrane is suitable, and there is no visible liquid flow, which can be placed in the pocket.
The use and maintenance of 3, copper sulfate reference electrode
First, the surface of the reference electrode should be kept clean. When it is not used, a plastic bag or a rubber cap should be used to cover the porous plug to avoid being polluted. Then is the replacement of copper sulfate inside regularly, and grinding materials used clean non metal bars; for example, the use of silica sand instead of alumina sandpaper clean copper, if the solution becomes turbid, the drained and replaced the copper sulfate solution. Make sure that there is still undissolved crystals in the solution; this saturated copper sulfate solution can prevent copper corrosion and make the electrode stable. In a polluted environment, it is necessary to maintain the electrode after the use of the electrode. The pollution of chlorinated compounds can change the chemical reaction. When the concentration is 5ppt, the reference potential becomes a mixed potential with -20mV deviation. When the concentration is 100ppt, the deviation reaches -95mV. During the construction of cathodic protection works, we should prepare a reference electrode. If the electrode is missing, another reference electrode can be used to continue working.
When the reference electrode is used in the field, it is necessary to prepare another new electrode so that it is accurate to calibrate the electrode used in the field. However, when the value of the calibration electrode is more than 5mV between the value of the calibrated electrode and the reference electrode measured at the site, it is necessary to clean the electrodes used in the construction site.
Because the temperature and sunlight are different in the construction environment, it is necessary to correct the change of the potential. It is necessary to record the temperature at the same time as the value of the reference electrode is read, according to the potential correction of the temperature. When the reference temperature value is higher or lower than the actual temperature value, we must add or subtract the temperature correction value of 0.5mV/ degree F or 0.9mV/ degree C when recording.
In the process of using reference electrode, we need shielding electrode to avoid direct exposure to sunlight, and we can use black tape to cover the transparent part of the electrode. The degree of exposure to sunlight is different. The values measured by reference electrodes will also be different. Under the condition of better sunlight, the reference electrode value of the reference electrode is higher than that of the reference electrode in the dark place without sunlight, which is 10 to 50mV.
In special environments, reference electrodes should also choose different types according to different environments, for example, the special reference electrode inside the storage tank, which is used to measure the cathodic protection potential in the tank wall or other water medium. The structure of this special reference electrode is to fix a pure zinc rod in a porous nonmetal shell, ensuring that the electrode does not have direct contact with the protected equipment. The potential of the reference electrode in the inner wall of the storage tank is used in the sleeve to avoid contacting directly with the wall. The electrode potential is -1.10V CSE, the potential is stable, the drift or polarization is less than 5%, and the protective potential of the structure should be less than +0.25V. The main components of the reference electrode for the inner wall of the storage tank are: A1 is less than 0.005%, Cd is less than 0.003%, Fe is less than 0.0014%, Cu is less than 0.002%, Pb is less than 0.003%, Zn is the allowance. 1. use of portable reference electrode: Portable copper sulfate reference electrode is suitable for field use. It is mainly used to measure the natural potential and cathodic protection potential of underground metal pipelines, measure the stray current in the soil, and also can be used to measure the potential of the steel bar in the cable metal sheath and concrete. The electrode can be used as a reference electrode for the control potential in an external current cathodic protection system where the soil is more sticky. It can be used in various kinds of soil and fresh water.
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