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Why Is The Long Common Electrode Always Grounded In The 61F's Floatless Level Controller Connection Diagrams?
There are three reasons for this grounding.
- 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.
- 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.
- Preventing Electric Shock
The ground is needed to prevent electric shock in case of electric leakage.
Link:
http://www.myomron.com/index.php?action=kb&print=771
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