User guide

13
Leica ASP200 S
2.3 Safety features on the instrument
The Leica ASP200 tissue processor is equipped with numerous safety func-
tions and with sophisticated software control mechanisms. These ensure
that the specimens remain undamaged in the event of a power failure or
other malfunction during the infiltration process and that the infiltration is
completed successfully.
Overpressure protection
• Whenpowerisofftheairpumpandairvalvesdefaulttoasafecondition
(retort vented, no pressure generation).
• Ifthepumpisnotstoppedatthecorrectmomentduringthepressuriza-
tion, the power supply is interrupted by a separate electronic circuit.
• Inaddition,thereisasafetyreliefvalvethatventsallexcessairpump
output to atmosphere.
Overcurrent protection
• Overcurrentconditionsareprotectedagainstbyboththemainfuseand
the separate heating power fuses.
Overheating protection
An error is indicated and all heating is stopped by the microprocessor –
control if the instrument detects any of the following conditions:
• Abnormallyhightemperature(>75°C)
• Contradictoryresultsofthetemperaturesensors
• Failureofoneormoreheatingpowercontrolcomponents
• Ifthemicroprocessorfailstointerruptheatingpower,independenttem-
perature limiting hardware circuits limit the temperature rise to a safe
level.
• Ifthetemperaturelimitingcircuitsmalfunction,anindependenthard-
ware thermal fuse circuit cuts power to the heating elements.
Over vacuum protection
• Thevacuumsystemisnotcapableofgeneratingadangerousvacuum
condition.
Overcurrent protection
• Overcurrentconditionsareprotectedagainstbyboththemainfuseand
the separate heating power fuses.
2. Safety