Introduction
What is a potentiostat?
The potentiostat itself is a branch under a rectifier with constant potential and constant current function.
Constant potential refers to the reference electrode feedback as a constant standard to control the output of the finisher.
Very simple, for example, a newly built pipeline, the cathodic protection potential requires -1.2V, then the potentiostat given potential is set at -1.2V, then the potentiostat is increased in order to achieve the -1.2v requirement. Until the potential is -1.2V. At this time, the output voltage is 10V, for example, 5A, then we can say that this pipeline meets the protection requirements, the required voltage is 10V, and the required current is 5A.
If there is a problem with the constant potential, such as interference, reference electrode damage, etc., how does the potentiostat work?
At this time, a constant current function is required, and a constant current output, that is, the current output does not change, and the voltage changes. Or the last example, if the constant potential is damaged, how should I set the constant current? We learned from the previous paragraph that the current required by this pipeline is 5A. In this case, we should set the constant current to 5A. To the test pile, use the portable reference to measure the true potential of the pipe under -1.2v. If it is, then it is suitable to give 5A. If it is small, add some current. If it is big, it will reduce the current. This is people. Often said to run manually.
Wiring procedure
The wiring of the potentiostat is not complicated. It is generally composed of 4 cables (regardless of the signal wiring that can be extracted by auxiliary circuits such as error and fault alarm), which are respectively connected to: output cathode, output anode, zero cathode, and reference electrode. The output cathode is the negative terminal of the potentiostat output, connected to the energized point of the protected object, and the output anode is the positive terminal of the potentiostat, connected to the auxiliary anode (ground bed or deep well anode); the zero position is the instrument circuit The ground end is connected to the vicinity of the energized point of the protected object, and the reference electrode is the sampling signal input end, and the reference electrode disposed near the energizing point is buried. The output cathode and output anode cables must have sufficient cross-sectional area, generally not less than 10 mm2; zero-connected cathode and reference electrodes do not require cable cross-section, only sufficient strength is considered. The wiring of the potentiostat should be copper wire, and the distal end should be soldered.
It is worth noting that the zero connection is almost the same point as the power-on point (the same point is explained by the concept of electricity, it should leave 50~100mm during construction, avoiding current inrush), but it must be wired separately, because the zero position The yin is the ground of the entire instrument circuit. This "ground" must be built on the object to be protected (pipe) to achieve proper control. Therefore, the short line should not be used to connect the zero cathode to the output cathode, even though it is pressed. The concept is also the same.
Finally, the potentiostat is an important instrument for electrochemical research and application. There are many types. The above is the basic aspect of the potentiostat for cathodic protection.
maintenance
l Observe the operating condition of the equipment every day, record the output current, output voltage, and set potential of the potentiostat (the set potential is -1.50v for this project) and measure the potential.
l When the equipment is running normally, the pipeline protection potential is measured regularly through the test pile, and records are made. If the pipeline protection potential value is found to be -850mv, the professional should be notified.
l Check the device for any abnormalities at any time. If the equipment is faulty or abnormal, such as: noise increases; the output has a large swing; if the temperature of the cabinet exceeds 75 °C or smells the odor caused by overheating of the equipment, the equipment should be shut down in time.
l The potentiostat should be continuously operated continuously. When the automatic status of the equipment fails, it can be switched to the manual state.
l When the equipment is faulty, it should be repaired by electrical professional maintenance personnel.
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