General Warnings; Electrical Connections; Power Supply Connection - Endress+Hauser PROline prosonic flow 93 Ex-Dokumentation Zu Den Betriebsanleitungen

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General warnings

Warning:
• Installation, connection to the electricity supply, commissioning and maintenance of
the devices must be carried out by qualified specialists trained to work on Ex-rated
devices.
• Compliance with national regulations relating to the installation of devices in poten-
tially explosive atmospheres is mandatory, if such regulations exist.
• Open the device only when it is de-energized (and after a delay of at least 10 minutes
following shutdown of the power supply).
• The housing of the Ex-rated transmitter can be turned in 90° steps. Whereas the non-
Ex version has a bayonet adapter, however, the Ex version has a thread. Recesses for
centering the worm screw are provided to prevent inadvertent movement of the trans-
mitter housing.
It is permissible to turn the transmitter housing through a maximum of 180° during
operation (in either direction), without compromising explosion protection.
After turning the housing the worm screw must be fastened again.
• The screw cap has to be removed before the local display can be turned, and this
must be done with the device de-energized (and after a delay of at least 10 minutes
following shutdown of the power supply).

Electrical connections

Power supply connection

➁
Esc
-
➀
➀ = power supply cable
Fig. 1:
➁ = ground terminal for potential equalisation
A = view A
➁
Fig. 2: Ground terminal for potential equalisation
Caution:
• The transmitter ➀ is to be securely connected to the potential equalization system
using the screw terminal ➁ on the outside of the transmitter housing.
• The sensor holders are to be grounded using the external screw terminal ➃. Alterna-
tively, the sensors can be connected to the potential equalization system via the pipe-
line when a ground connection according to regulations can be assured.
PROline Prosonic Flow 93 PROFIBUS DP/PA
r
A
+ E
➀
A
N(-)
L(+)
➃
Endress+Hauser
➀