Instrument grounding
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Which types of instruments need to be grounded? Does it mean that the enclosures of all instruments must be grounded, as well as the instrument wiring ducts and junction boxes?
Article 5.1 Instrument grounding in the HGT 20513-2014 Instrument System Grounding Design Specification
You can only follow the specifications in this case; anyway, 24VDC systems generally do not require protective grounding.
However, for some 24V meters that have a grounding terminal, it was connected as required
What needs to be done in this non-explosion-proof area?
No, the meter has grounding marks and grounding screws as well, which are said to be used for lightning protection and interference prevention
Grounding of instrumentation equipment is required by the equipment itself; not all instruments need to be grounded. Those that do require grounding generally have a reference point in their internal circuits. If they are not grounded, the reference voltage may not be zero, which can lead to errors, such as in electromagnetic flowmeters
Are all the tables installed on the top of the tower? Do we still need lightning protection? Interference is way too mystical.