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Question
Why is the long common electrode always grounded in the 61F's Floatless Level Controller connection diagrams?
Answer
There are three reasons for this ground.
1.Preventing Improper Operation Due to Inductive Noise
Since there is just a weak current (about 1 mA at 8 VAC) between the 61F Controller and the electrodes, it is easy for inductive noise to cause improper operation when there is no ground.
2.Protecting the 61F Controller from Surge Voltage
The common electrode must be grounded properly to protect the 61F Controller's internal circuits from surges caused by lightning or other equipment.
3.Preventing Electric Shock
The ground is needed to prevent electric shock in case of electric leakage.
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Other Level Switches FAQ
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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"?
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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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