Ensuring Potential Equalization; Requirements; Metal Process Connections; Plastic Process Connections - Endress+Hauser IO-Link Dosimag Operating Instructions Manual

Electrical connection
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7.4

Ensuring potential equalization

7.4.1

Requirements

For potential equalization:
• Pay attention to in-house grounding concepts
• Take account of operating conditions like the pipe material and grounding
• Connect the medium and measuring instrument to the same electric potential
• Use a ground cable with a minimum cross-section of 6 mm2 (0.0093 in2) and a cable
lug for potential equalization connections
For devices intended for use in hazardous locations, please observe the guidelines in
the Ex documentation (XA).
7.4.2

Metal process connections

Potential equalization is via the metal process connections that are in contact with the
medium and mounted directly on the measuring instrument.
7.4.3

Plastic process connections

Note the following when using grounding rings:
• Depending on the option ordered, plastic disks are used instead of grounding rings
on some process connections. The plastic disks act as "spacers" and do not have any
potential equalization function. They perform a significant sealing function at the
measuring instrument and process connection interfaces. In the case of process
connections without metal grounding rings, the plastic disks and seals must never
be removed. Plastic disks and seals must always be installed.
• Grounding rings can be ordered separately as an accessory from Endress+Hauser
→  65. The grounding rings must be compatible with the electrode material, as
otherwise there is the danger that the electrodes could be destroyed by
electrochemical corrosion.
Material specifications →  61.
• Grounding rings, including seals, are installed inside the process connections. This
does not affect the installed length.
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