Astell EPMXN278-3_page 4_SAFETY VALVE

Astell EPMXN278-3_page 4_SAFETY VALVE
epmxn278-3c.doc
Page 4
SAFETY VALVE
The safety valve should be checked
as follows :-
IMPORTANT INFORMATION
This machine contains a Safety Valve
( PRESSURE RELIEF SAFETY VALVE)
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To comply with typical safety regulations this
must be kept in a serviceable condition and it
must also be regularly tested. Testperiods
depend upon local regulations , however ;-
Astell Scientific advise that the Safety
Valve should be tested every 3 months.
A special SAFETY VALVE TEST PROGRAM is
provided to make this easier, accessed from the
Supervisor level.
On models with the ** automatic safety valve test
warning system ** this also resets the “ safety
valve test overdue” warning message, for the
next 3 month period.
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Start Program running . Sterilizer will start
and temperature will rise towards 142 C and
pressure to approx. 2.5 bar. When pressure
reaches 2.4 to 2.68 Bar the safety-valve
should Blow Off
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This discharges out at the tank filler vent or
safety valve outlet ,so keep objects and
personnel away from the machine and warn
other people of the resulting noise
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IF THE SAFETY VALVE DOES NOT BLOW
DOWN AT THE STATED PRESSURE IT
MUST BE CHECKED AND ADJUSTED BY A
QUALIFIED ENGINEER.
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Once the valve has operated correctly this
Safety Valve Test is complete , .Press & hold
the [Key] , and Press [START] at the same
time. This allows you to stop the program
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€
Answer "Yes" to "Stop”
Safety valve Position
The Safety Valve is situated in different positions
depending upon model specification and size. It
is either inside the water tank or mounted
external to the tank, at the rear in a position
which allows for operation of the test actuator on
the valve should this be required..
Later models – with the ** automatic safety valve
test warning system ** - see note ** below , monitor the date when the
SAFETY VALVE
TEST PROGRAM has been run.
When the program has been started, the system
then checks the date and shows a warning after
the 3 month period has elapsed, ( If a printer is
fitted this also shows on the printout.)
Note **
Software issue NSW422B8A introduced the
automatic safety valve test warning system .
Software issues before that do not have this
system but the requirement for testing is
unchanged.
Go to SUPERVISOR MODE, and. Select
SAFETY-VALVE TESTING and answer YES
to “ARE YOU SURE? Question. This sets up
the next program cycle as a Safety Valve
Test Session similar to that described above.
This will safely terminate the program., and
start Cooling Down to Completion .
At the end , open chamber and continue normal
use
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