W&H MN-111, Instructions For Use Manual

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Technical data
90 MN-111 | Instructions for use | MN-111 W&H Med ENG Rev11 | 2019/01/25 | © 2019 W&H Sterilization Srl
Sterilization program phases
LEGEND OF THE STERILIZATION PROGRAM PHASES
Following is the description of the sterilization phases.
Code Phase Description
PHE Pre-heating
phase Pre-heating of the sterilizer. This phase is not considered a part of the cycle.
HEA1
HEA2
Heating
phase
(steam
pressure
pulses)
Initial heating phase to remove the air from the sterilization chamber. Air is removed using pressure pulses followed by discharge phases. The
iteration of these phases reduce the percentage of air inside the chamber and determinates the correct sterilization conditions.
HEA3 Pressure
rise Heating phase to achieve the sterilization conditions (pressure and temperature) for the selected cycle.
STLZ Sterilization
phase
Sterilization condition (pressure and temperature) maintained for the time specified for the selected cycle. During this phase the unit controls the
theoretical temperature (pressure converted in temperature, because of physical behaviour of water) and the steam temperature inside the
chamber. The value must be between the sterilization temperature band, and the difference between them must be lower than 35.6 °F (2 °C). If the
temperature drops below the sterilization temperature band a restart process procedure is automatically executed by the sterilizer (according to
ST55). The sterilizer controls the sterilization condition through steam generation. The steam generation is controlled by a PID, that modulates the
electrical power using as feedback the instant average between theoretical and internal temperature.
DRY Exhausting
drying
phase
The objective of this phase is to dry the load placed in the sterilizer chamber. The drying phase is divided in two step:
n
The first step is the depressurization phase, when most of the steam is removed from the chamber. The second step is the drying of the
load.
n
Duration of the DRY phase depends on the selected profile.
LEV
Levelling
phase Pressure inside the sterilization chamber is leveled to the atmospheric pressure.