Endress+Hauser PROline Prosonic Flow 93 Ex-Dokumentation Zu Den Betriebsanleitungen Seite 36

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Removing and installing printed circuit boards
Field housing: removing and installing printed circuit boards (Fig. 6)
Caution!
• Risk of damaging electronic components (ESD protection). Static electricity can dam-
age electronic components or impair their operability. Use a workplace with a
grounded working surface purposely built for electrostatically sensitive devices!
Warning!
• Danger of explosion! Open the device only when it is de-energized (and after a delay
of at least 10 minutes following shutdown of the power supply).
• Take care that no dust enters the transmitter.
1. Remove the cover of the electronics compartment.
2. Remove the local display (1) as follows:
– Press in the latches (1.1) at the side and remove the display module.
– Disconnect the ribbon cable (1.2) of the display module from the amplifier board.
3. Remove the screws and remove the cover (2) from the electronics compartment.
4. Remove power unit board and I/O board (3, 5):
Insert a thin pin into the hole (8) provided for the purpose and pull the board clear of
its holder.
5. Remove submodules (6):
No tools are required for removing the submodules (inputs/outputs) from the I/O
board. Installation is also a no-tools operation.
Caution!
Only certain combinations of submodules on the I/O board are permissible
(see Page 8 ff.). The individual slots are marked and correspond to certain terminals
in the connection compartment of the transmitter:
"INPUT / OUTPUT 2" slot = terminals 24 / 25
"INPUT / OUTPUT 3" slot = terminals 22 / 23
"INPUT / OUTPUT 4" slot = terminals 20 / 21
6. Remove amplifier board (4):
– Disconnect the plug of the sensor signal cable (4.2) from the board.
– Insert a thin pin into the hole (8) provided for the purpose and pull the board clear
of its holder.
7. Installation is the reverse of the removal procedure.
Caution!
Use only original Endress+Hauser parts. Only replace printed circuit boards with
identical ones.
8. If you cannot maintain the dielectric strength of the device during the work stages,
carry out a test according to the manufacturer's specifications.
PROline Prosonic Flow 93
Endress+Hauser