8
It is of the highest importance that the operational reliability of these
components is continuously upheld during their entire service life.
The signs are used not only to indicate important components, but also
to draw attention to other safety factors that call for special attention,
such as dimensions, tolerances, materials, etc.
Doors
The doors are closed and locked while the process is running and remain
locked in the event of media loss. The doors cannot be opened until the
pressure in the chamber has been equalized with the ambient pressure,
not even if fault management gives an opening command. The sliding
doors are operated by a compressed air cylinder which has a severely
throttled inlet. A drain valve with a considerably greater flow capacity
than the inlet is located in the bottom of the cylinder, which is pointing
upwards. Objects that obstruct the upward motion of the door press
down a metal plate which opens the drain valve, causing the door
motion to stop. This prevents operator injuries and material damage. A
support latch holds the door so that it does not open if the pneumatic
operating cylinder loses pressure. When the pressure of the compressed
air is so low that the door cylinder cannot support the weight of the door,
the air is not capable of pulling away the support latch.
Emergency stop
In the front panel, at the side of the door, there is a pushbutton with these
functions:
A On door operation.
to stop the door motion immediately during door operation.
Pressing the button triggers an alarm. This alarm stops the door
immediately:
B When the door is closed
The current process is aborted and all valves for media to the
chamber are closed. This also triggers an alarm.
Door interlock key
The front panel contains a key switch, intended for use when cleaning
the sterilizer or when it is necessary to reach into the chamber for any
reason.
With the key removed, the door cannot be closed. See also under
"Cleaning the chamber" in the Operation chapter.
Trim plates
Panels are possible to dismount by means of tools or keys. The panels
form a barrier for operators, but not for specially trained technicians.
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