FAQ No. FAQ00851
Question
Why is the long common electrode always
grounded in the 61F Floatless Level
Controller's 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.
Other Level Controller
FAQs
 Can a 61F-GPN-V50 Leak Detector and Electrode be used as a set?
Is it acceptable to use a steel tank as the ground electrode and not use the 61F Controller’s ground electrode?
Why do the specifications for the 61F High-sensitivity Controller say, "possible to use with 15 k-ohm or less, however, this may cause reset failure"?
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