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| Programmable Logic Controller | ||
 The type PCD4 programmable logic controller used is manufactured by SAIA. Its powerful functions and speed render sterilization cycle efficiency control "intelligent". Equipped with both EPROM and RAM memories, cycle parameters can be edited by authorized personnel possessing an access code. PLC temperature control is based on a 100 Ohm PT probe located on the chamber floor and physically separate from the recorder temperature sensor. This controller function handles fully preprogrammed, access code protected sterilization cycles. The use of an absolute pressure sensor of unparalleled precision adds, in addition to vacuum set point detection and vacuum stage validation, new functions such as leak value measurements with digital output to tape. Also, the programmable logic controller will compute the sterilization factor Fo, which is likewise recorded on tape. Indeed, this programmable logic controller; designed to meet future European Standards, ushers in a new era of operator-oriented physical parameter control in the sterilization field. |
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| Keypad | ||
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| Interfacing with the programmable logic controller, the " intelligent" operator terminal features a keypad and a 25-character display facilitating programming, vacuum stage monitoring and alarm identification. | ||
| Control | ||
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Digital display includes chamber temperature and pressure, sterilization
factor Fo, current cycle timer, date, time-of-day and cycle timer |
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| Parameter programming | Main & submenus | |
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| Access to the parameter menus is protected by code. Authorized personnel can edit such holding time parameters as sterilization time and temperature and final vacuum (drying) stages, with or without adding heat. New cycles can be stored under index identifiers. Other menu options include autoclave dedication through cycle command key disabling, conditional start requiring keyboard entry of lot and/or operator number. Executive pharmacists and sterilization management have a full range of programmable functions at their disposal to ensure procedural operation and traceability. | ||
| Sterilization cycles | ||
| 41 sterilization cycle storage capacity | ||
| Preprogrammed cycles: | ||
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| In conformance with NFS 90.320 standard certification requirements, the three basic programs, i.e., "instruments", "textiles" and "rubber" having been type-approved using typical loads, are therefore ROM-based and tamper-proof. | ||
| Test cycles: | ||
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| Test cycles are ROM-based programs. The leak rate test is a Bowie-Dick test complement, quantifying chamber tightness. | ||
| Password-protected programmable cycles: | ||
| Password holders can access the programming menu to customize a basic cycle. The shaded and hatched areas on the diagrams are user-programmable to create new sterilization protocols. Basic cycle variation storage space is 9 cycles/register; i.e. 27 in all. |  |
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| Factory-programmed cycles: | ||
| Autoclaves can be ordered with up to 7 ROM-based factory-programmed cycles, all phases of which have been checked and validated. | ||
| <- 15 cc, > 15 cc liquid cycles: | ||
| Both programs
are standard autoclave software. It is to be noted that the > 15 cc software is delivered disabled. Please contact us for enabling procedures. |
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| Sterilization checks | ||
 Cycle
pressure and temperature curves, process identification and load data
are all recorded on the same tape. Europe range series 2H sterilizers
are standard equipped with analog and digital recorders for autoclave
serial, cycle, lot and operator number, date, time-of-day, cycle type
selected, holding temperature and time processing and cycle pressure/temperature
curve monitoring. Recorder configuration allows for two additional
temperature tracks with no hardware modification (option OPR 4002). |
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| Leak rate test: | ||
| The leak rate test quantifies vacuum chamber tightness and will detect leaks of >1.3 mbar/minute, a rate which would ruin the sterilization process. The programmable logic controller computes leak rates from absolute pressure sensor signals and outputs the results to the recorder at the completion of the test cycle. | ||
| Sterilization factor Fo: | ||
| Using signals from the chamber floor temperature sensor, the programmable logic controller computes the temperature rise and outputs the cycle sterilization factor found to both tape and display. | ||
| Alarm and error messages: | ||
| Failure to attain low pressure set points or the occurrence of environmental factors affecting autoclave operation (power failures, compressed air; mains water or control system component failures) will generate an alarm message that is both displayed on-screen and recorded on the tape. | ||
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