The potentiostat is said to be a negative feedback amplification-output system, which is closed-loop regulated with the protected object (such as buried pipeline). The potential of the energization point is measured by the reference electrode, and the sampling signal is compared with the control signal to achieve control. The polarization current output is adjusted so that the potential of the energization point is maintained at the set control potential.
Steps
(1) boot
a. Potentiometer "manual setting" knob, "automatic setting" knob counterclockwise to the end, the "manual / automatic" switch to the "automatic" position, the "measurement selection" switch to "given" position.
b. Turn on the main power supply, and turn the power switch on to the "on" position. At this time, the potentiostat is powered on.
c. Turn the "Stop/Run" knob to "Run" and the potentiostat power is on.
D.. Slowly adjust the "automatic adjustment" knob of the potentiostat, observe the potentiometer indication, and stop the adjustment when the set value is reached.
f. Move the device's "Measurement Selection" switch to the "C1" position, at which point the millivoltmeter indicates the pipe protection potential. If the device jumps to "Fault", press the "Reset" button switch to resume the running state.
g. Observe at least 0.5 hours after completing the above operation. After the device has no abnormal heat and no alarm, record the output current from the ammeter, record the output voltage from the voltmeter, and record the protection potential from the potential meter.
(2) Downtime
Move the potentiostat device power switch to the "off" position, and adjust the auto adjustment knob counterclockwise.
(3) Manual operation
In the event of a device failure, the electrical engineer confirms that the potentiostat can be operated in manual mode.
The place where the potentiostat is installed should be suitable for ventilation and heat dissipation. The equipment should be handled gently. When installing the wiring, it should be checked whether the power supply is suitable for the specified voltage value of the potentiostat.
Install a potentiostat in a place with a tank nearby. An explosion-proof type of rectified power supply should be used. Most of the time, the rectified power supply is installed in the instrument room.
When installing, be sure to wire according to the wiring diagram, in order to ensure the correct polarity of the output power. Moreover, there is a clear identifier "+" "-" in the wiring place. First, use the multimeter to test whether the terminal is accurate. Then try to seal the cable connector after power-on. After the equipment is installed, the chassis must be guaranteed. Continuous good grounding performance.
Before applying the installed potentiostat to the potentiostat, the natural potential of the pipeline must be measured, and the potential should be around -0.6V. It is noted that if there is a cathodic protection device for temporary use on the pipeline, The potentiometer tested here may be at -1.10V or lower. Next, the potential of the anode bed should be measured, and the potential of the anode wrapped by the coke back filler will generally be between +0.20V~+0.30V CSE. Note: If the filler uses a galvanized iron plate cylinder.
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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