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System control of sterilizer

The system control of autoclave sterilizer is also a critical part. Good autoclave manufacturer designs according to the specification, tests and operation of a sterilization equipment requires a systematic approach to ensure that the equipment as designed meets specifications and is fit for intended use. Many choices may be evaluated during definition of the control system design. Some factors that need to be considered are as the following.

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The control system with other systems available in the area may be some interfaces. The data collection should be based on the requirements of company such as local printer report, network printer report, building control system report and historical data trending analysis. Controls provided with electronic data collection intended for use in the manufacture of pharmaceutical products are required to comply with regional regulatory expectations. Define the list of process variables to be recorded and frequency of recording such as the autoclave chamber pressure, chamber temperature, jacket temperature and run time. If the system provides a report, define the expectations for information to be included in the report. How complex or simple a control system is needed. Describe the control system requirements in terms of manual, semi-automatic and automatic operation. Whether the operation and control of the system is to be performed at an operator interface panel on the sterilizer or at an external control system. State whether the access is provided through a date-communication link. Specify security access levels for operation, cycle programming, and maintenance activities, and the security access is typically local and may be sever verified. Control type should be taken into consideration on and off or analog. Digital on and off and proportional analog valves are both successfully used in the establishment of steady state conditions within a chamber and load. Orifice plates and or flow control valves positioned on the chamber inlet and outlet. Their settings or dimensions therefore become key control parameters.
The following are the requirements for the control system. The control system of temperature and pressure. Use a thermostatic steam trap, open when the medium cool and close when it hot, to remove the air or condensate water from the chamber. A sterilization cycle timer and a sequencing controller. Set the ability to sterilization exposition parameters such as add or subtract number of pulses, vacuum levels and exposure time. Confirm that the system is equipped with door interlock system. For example, the door cannot be sealed before it is closed and locked. The cycle cannot be initiated until the door is sealed. The cycle can be initiated only if there are no active alarms. The door cannot be unsealed before the sterilization cycle is completed and the chamber pressure has equalized to the atmospheric pressure. In case the cycle is aborted but the exposure phase was not completed , only the loading side can be opened.

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