Product Details
Constant potential instrument fault diagnosis |
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Fault phenomenon |
Possible causes |
Verification method |
The output voltage and current of the constant potential instrument both increase |
Severe damage to the pipeline anti-corrosion layer, short circuit of the insulated joint |
Check the insulation performance of the insulated joint, whether the potential away from the insulated joint is more negative |
Reference electrode failure, electrolyte flow empty or reference cable grounding |
Calibrate the buried reference electrode |
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Reference electrode is disturbed by cathodic voltage field |
Measure the surface voltage field at the buried position of the reference electrode |
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The output voltage of the constant potential instrument continues to rise until an alarm, with zero output current |
Break in the cathode and anode cables |
Measure the resistance between the zero position and the cathode cable; if the resistance is not large, the anode cable is broken. Use PCM to find the cable path and break point |
The constant potential instrument has a stable output voltage, no output current, and the pipeline ground potential meets the standard |
The pipeline ground potential is more negative than the set potential; the constant potential instrument rectifies the pipeline AC interference, causing the pipeline ground potential to be lower than the set value |
Set a more negative potential and check if the constant potential instrument has output current |
The pipeline is connected to a sacrificial anode |
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The output voltage of the constant potential instrument increases, while the current remains unchanged |
The grounding resistance of the anode bed increases |
Measure the grounding resistance of the anode bed |
The output current of the constant potential instrument decreases |
The position of the reference electrode is affected by anode interference, and the jumper wire is broken |
Turn off the area protection power supply in the station, check if the output current of the constant potential instrument increases. Check if the jumper wire is open |
The output current of the constant potential instrument fluctuates constantly |
The pipeline is disturbed by dynamic DC stray current, and the constant potential instrument is in on-off mode |
Turn off the constant potential instrument, measure the pipeline ground potential, and check the working mode of the constant potential instrument |
The output current and voltage of the constant potential instrument increase |
There are generally multiple constant potential instruments in the cathodic protection room |
If the potential difference is less than 100mV, it is generally considered that there is no problem with the reference electrode. When there is only one constant potential instrument, the potential measured by the portable reference electrode at the junction point can be compared with the potential measured by the buried reference electrode |
Potentiostat
Key words:
Potentiostat
Classification:
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