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APPLICATION NOTE

APPLICATION NOTE. " MEDICAL STERILIZERS ". APPLICATION. To kill bacteria , the products to be sterilized are placed into a temperature. chamber at 121 Deg C , for a specified time . A recorder is used to document that

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APPLICATION NOTE

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  1. APPLICATION NOTE " MEDICAL STERILIZERS " APPLICATION To kill bacteria , the products to be sterilized are placed into a temperature chamber at 121 Deg C , for a specified time . A recorder is used to document that sterilzation was accomplished according to the local regulations. CUSTOMER NEEDS . Need to record the process temperature of the cavity ( T1 ) , the internal ? pressure ( P ) , and optionally the inside temperature of the load ( T2 ) in the sterilizer . The Sterilization sequence ?is made by the PLC of the autoclave ? A contact signals the Start ?, and the End ? of the sterilization sequence ? The recorded batch chart must be ? filed ? after each operation ? This record must be documented and ? proof ?the good process operation ? The price of the recorder must be as low as possible ? P L C P L C D1 T 2 T 1 P Cavity LOAD

  2. HONEYWELL Solution : The pen recorder with minor modifications can meet the customer needs . DPR 100 A Product description : Recorder 2 or 3 pen ? Analogue display ? Unit is delivered from the factory with the following configuration : ? Channel 1 ( P ) = Pressure inside the a utoclave . Input 1 = 4 to 20 mA Scale 1 = - 1 , 0 , +4 Bars . Channel 2 = Temperature of the cavity Input 2 ( T1 ) = 50 to 150 Deg C Pt 100 Scale2 = 50 to 150 Deg C . Channel 3 = Temperature of the product ( insert probe ) : Optional nput 3 ( T2 ) = 50 to 150 Deg C Pt 100 I Scale 3 = 50 to 150 Deg C . 2 Digital input contacts ( see here below ) . No alarm output . Chart 0 to 100 linear , 100 divisions . Chart fan fold Special function ( ST ) The unit should be built with a special Print inhibit ? function as following : The digital input contact 1 makes this operation : At contact closure : ? - Start immediately the recorder in operation without making the chart references ( at the preconfigured chart speed ) - The unit prints : Date , Time , Chart speed , and recorder address . Then the unit records the process variables ? At contact opening : ? - The unit prints time - Continue to print the PV抯 until the memory buffer is emptied , but stop the aquisitions - T hen makes a fast chart advance of 50 to 60 mm - Then , stops the recording . ( ready to cut the chart )

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