The conductivity meter's bridge section may fail, which is typically indicated by an unstable indicator or the inability to find a stable balance point when adjusting the reading knob or pressing the override button during high or low range measurements. If you encounter such issues, it's important to identify and resolve the problem effectively. Below are detailed troubleshooting steps for common faults in a conductivity meter.
1. Start by checking the electrode system. Remove the electrode and measure its resistance using a known resistor of approximately 1000 ohms. If the measured resistance is close to 1000 ohms, the issue likely lies with the electrode or its wiring. In this case, replace or repair the electrode system. If no reading is obtained, proceed to further checks.
2. The reading knob may have internal contact issues due to dirt or wear. Gently clean the sliding contacts inside the knob using a soft silk cloth to ensure proper electrical connection.
3. The multiplier button can also experience problems due to misaligned or dirty internal switches. Use a small amount of absolute ethanol or trichloroethylene to clean and reset the switch, ensuring smooth operation.
4. Capacitance issues might cause the indicator strip to appear blurry. Adjust the bridge arm capacitance to achieve a clear and accurate reading.
Failure of the Oscillator and Cathode Output
If the meter fails to reach a precise balance point on the high range, start by replacing the oscillator tube and cathode output tube. If the problem persists, check the voltages and wiring of both tubes. The oscillator tube’s anode should read around 150V, while the second grid should be approximately 60V. The cathode output tube’s anode should be around 250V. You can monitor the signal using a high-impedance headphone or speaker (with an output transformer) or an oscilloscope to trace the signal path and identify the fault.
Power Supply Section
1. If the low-voltage AC power supply fails, the indicator light and filaments will not illuminate. Begin your inspection by checking the power input, then move to the primary and secondary windings of the transformer.
2. For the high-voltage DC power supply, if the indicator light and filaments are working but the electric eye tube does not emit green light, the issue could be in the high-voltage section. Measure the anode voltages of the rectifier using a 500V AC multimeter; they should be around 250V relative to ground. If not, the problem may lie in the transformer’s secondary high voltage or wiring. If voltage is present, check the cathode of the rectifier tube with a 500V DC multimeter—should be around 200V or higher. If there is no DC voltage or it’s too low, replace the rectifier or filter capacitor and check all connections.
Indicator Failure
1. If the edge of the indicator band remains blurred after adjusting the bridge capacitance, consider replacing the electric eye tube. The 6E1 model produces a fan-shaped green band, while the 6E2 model moves vertically, and their wiring differs accordingly.
2. If the indicator is unresponsive, try replacing the amplifier tube and electric eye tube. If sensitivity remains low, check the voltage and wiring at each stage to locate the issue.
By following these steps, you can efficiently diagnose and fix common issues in a conductivity meter, ensuring accurate and reliable measurements.
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