Potential Equalization; Degree Of Protection - Endress+Hauser iTEMP TMT125 Bedienungsanleitung

Wiring
4.3

Potential equalization

Shielding and grounding of the Transmitter
"
Caution!
If the shield of the fieldbus transmission line is grounded for reasons related to EMC, Section
12.2.2.3 of IEC 60079-14 and Sections 6.2 and 6.3 of the FOUNDATION Fieldbus™
Application Guide 31.35 bit/s Intrinsically Safe Systems must always be observed.
The terminal S of the intrinsically safe fieldbus segment is:
• in case of using the field housing version connected internally to the housing. The housing should be connected to
the potential equalization.
#
Warning!
The housing of the field housing version must be connected to the potential equalization in case of Category 2G
(Zone 1) applications.
• in case of using the DIN rail version connected internally to the DIN rail. The DIN rail should be connected to the
cabinet and the cabinet should be connected to the potential equalization.
Depending on this the shield is automatically connected to the potential equalization.
Please also refer to Operating Instructions BA 013S/04/en "FOUNDATION Fieldbus™
Overview: Installation and Commissioning Guidelines" for configuration information.
4.4

Degree of protection

The device conforms to the requirements to IP 67 ingress protection for the field housing
version.In order to fulfill an IP 67 degree of protection after installation or service, the following
points must be taken into consideration:
• The housing seals must be clean and undamaged when inserted into their grooves. The seals
must be dried, cleaned or replaced if necessary.
• All housing screws and screw caps must be firmly tightened.
• The cables used for connection must be of the correct specified outside diameter (e.g. M20 x
1.5, cable diameter from 8 to 12 mm; 0.315 to 0.47").
• Firmly tighten the cable gland (→ å 8).
• The cables must loop down before they enter the cable glands ("water trap", → å 8). This
means that any moisture that may form cannot enter the gland. Install the device so that the
cable glands are not facing upwards.
• Cable glands not used are to be blanked off using stop plugs.
• Do not remove the grommet from the cable gland.
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TMT125
Endress+Hauser