FAQ No. FAQ01480
Question
Why do the specifications for the
61F High-sensitivity Floatless Level Controller say, 'possible to use with
15 kΩ 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 kΩ).
Other Level Controller
FAQs
 How do you measure the resistance between electrodes?
What does operation resistance mean?
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