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Question
Why do the specifications for the High-sensitivity 61F Floatless Level Controller say, "possible to use with 15 kOHM or less, however, this may cause reset failure"?
Answer
The interelectrode voltage of 61F is AC. This generates a floating capacitance between ground and the cable that connects the electrode bar to 61F body. The current that flows due to this cable-to-ground floating capacitance causes the reset failure.
The reset current for 61F High-sensitivity Controller is 0.05 mA AC min. If the current flowing through the ground capacity is, for example, 0.1 mA, there will be a reset failure because of the reset current (0.05 mA AC min.) even when there is no liquid between the electrodes.
Countermeasures:
1.Shorten the cable between the Electrode and 61F Controller. (For the 61F-GP-N8 High-sensitivity Controller, use a 0.75-mm2, 3-conductor, cabtyre cable that is 50 m or less in length.)
2.Use a General-purpose Controller for applications where the liquid resistance can be detected at ordinary sensitivity (0 to 4 kOHM).
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Other Level Switches FAQ
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Can two 61F Floatless Level Controllers and two Electrode Holders be used in the same tank?
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When voltage is applied to 61F Floatless Level Controller, it operates regardless of the actual liquid level. What is the cause of the problem and how can it be corrected?
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With 61F-G1 Floatless Level Controller, the water level of a water supply is above the E2' height, but the pump does not operate. What is the cause of the problem and how can it be corrected?
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