About Calibration - W&H Sterilizer Calibration Device Manual Del Usuario

About calibration

Why is calibration required?
During operation, the sterilizer continuously carries out both temperature and pressure measurements. This is possible as it incorporates the functions of
some measurement instruments installed in the sterilization chamber.
By calibration, these instruments are set to the precision requested by the sterilization process.
When is calibration required ?
Calibration is required in the following cases:
a) (LISA MB only) Whenever the clock chipset has been replaced, because the calibration parameters are stored in the the clock chipset.
b) If required by a an Official Authority.
When is calibration recommended ?
Calibration is recommended in the following cases:
a) Whenever a pressure or temperature sensor, or a printed circuit board has been replaced.
This is because any individual sensor has its own systematic error, and the calibration of the sterilizer is aimed to compensate this error by means of
correction factors stored in the memory of the sterlizer.
Replacing a sensor or a board involves re-calibration of the sterilizer, otherwise the wrong correction factors would be used, with possible depletion in
the measurement precision.
b) If alarms advising out-of range measurement start go off randomly during the normal use of the sterilizer.
This could mean that the sensor or the electronics has drifted (i.e. its systematic error has changed during the life of the sterilizer). Re-calibrating the
sterilizer recovers the drift that might have occurred.
Problems that CANNOT be solved by simple calibration
- If alarms are caused by sudden fluctuatios or peaks in temperature / pressure reading, as well as by loss of the reading itself, this is a symptom of a
bad hardware (sensor, electronic board or/and connection between them). These faults cannot be fixed by calibration, since they require a hardware
diagnosis and consequent replacement of the faulty component.
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