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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

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


Application note

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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