Galvanic Applied Sciences 943-TGX-CE, Руководство по эксплуатации

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Revision 4 34 April 2020
after 1 minute of rapid purge, and the progress of the initial purge will be indicated as
% COMPLETE .
4. Once the initial purge is successfully completed, the rapid purge solenoid valve will
close, the RAPID EXCHANGE indicator will extinguish, the SAFE PRESSURE
indicator will illuminate in blue, and the ENCLOSURE POWER indicator will change
colour from red to green. At this point the analyzer will power up.
Once the analyzer is powered up, it will only stay powered up as long as the internal pressure
inside the control cabinet remains above the set safe pressure. If safe pressure is lost due to
loss of instrument air pressure, loss of communication with the purge vent, or opening of the
control cabinet door, a 5 second countdown will be indicated on the EPCU display, at the end
of which the analyzer will automatically shut down. If it is necessary to open the control cabinet
door with the system powered up, the EPCU system needs to be bypassed. Refer to Section
3.3.
If the initial purge cycle cannot be successfully completed and the analyzer powered
on, confirm that the instrument air supply pressure to the analyzer is adequate, the
instrument air flow rate meets the requirements, the control cabinet door is fully
latched, the control cabinet door latches are not loose, and the rubber gasket around
the door frame of the control cabinet is not damaged or displaced.
3.3 EPCU Bypass
In normal operation, the EPCU will cause the analyzer system to automatically shut down when
the control cabinet door is open. However, for certain maintenance procedures it is necessary
to have the control cabinet door open with the analyzer powered on. In these situations, it will
be necessary to bypass the automatic shut down through the EPCU user interface.
EPCU bypass can ONLY be enabled once the analyzer has been successfully
powered on following the procedure in Section 3.2. It CANNOT be enabled prior to
performing the initial cabinet purging process, so if instrument air is not available
when the analyzer is not powered on, the analyzer cannot be powered up.
The following conditions MUST be adhered to prior to enabling EPCU bypass:
1. System Bypass must NOT be enabled unless explicitly permitted by company
and/or regulatory agency safety procedures.
2. System Bypass must NOT be enabled unless the installation environment
around the analyzer is known to be safe (i.e. non-explosive)
3. The user MUST follow ALL facility and regulatory agency procedures for
determining if the installation environment around the analyzer is safe.
4. The analyzer must NOT be operated with System Bypass enabled unless
qualified personnel are continuously in attendance AND the installation
environment around the analyzer continuously monitored to ensure that it
remains safe.
5. Should the installation environment suddenly become hazardous (explosive)
while System Bypass is enabled, the AC supply to the analyzer MUST
IMMEDIATELY be switched off OR System Bypass IMMEDIATELY disabled.