Tuttnauer 2540 ELV, Руководство по эксплуатации и техническому обслуживанию

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3.4 Program 4 – Cooling
Program 4 is intended to sterilize liquids. The sterilization temperature is
250
°
F (121ºC) with cooling. The cycle ends with cooling water circulated
around the outside of the chamber while compressed air is used inside the
chamber to maintain the liquid at a high boiling point.
•
Average cycle time: 1h30min for two containers holding 700ml each.
•
Average cooling stage time: 30min
Nominal Parameters
•
Sterilization temperature: 250ºF (121ºC).
•
Sterilization time: 20 min.
•
Dry time: None
Operations Sequence
•
Water Inlet phase: Water enters the chamber, to the required level.
•
Heating phase: Water heats up until steam reaches the preset sterilization
temperature.
•
Sterilization phase: Temperature is maintained constant at the preset
value for the preset sterilization time.
•
Cooling phase: During the cooling phase tap water is circulated around
the outside of the chamber to lower the temperature. Compressed air is
used to maintain pressure in the chamber, which in turn maintains a high
boiling point for the liquid just sterilized. This prevents bursting and
spillover of the vessels containing the liquid as the temperature is
reduced.. The temperature of the liquid needs to decrease to 90°C for the
cycle to be completed. The forced cooling process shortens the cooling
stage significantly.
•
Fast exhaust phase: After reaching the end temperature 194°F (90°C), the
exhaust valve is opened until the pressure in the chamber becomes equal
to the atmospheric pressure.
= Pressure
= Temperature
Time
Ambient Pressure
and Temperature
121°C