SU950293A1 - Apparatus for monitoring sterilization process - Google Patents

Description

(54) DEVICE FOR CONTROL OF STERILIZATION PROCESS

one

The invention relates to instrumentation used to control the quality of thermal sterilization equipment, such as microbiological production.

A device for monitoring the aging process is known, comprising a temperature sensor connected to a voltage-resistance converter and an analog-digital converter connected in series, a clock generator, a code converter, an indicator of the sterilization criterion value.

At the same time, the measurement of the sterilization criteria for drying is performed in two stages: the measurement of temperature values and their accumulation in a memory device encoded with a binary code; reading, data storage and determination of the actual value of the sterilization criteria 1.

However, the known device does not allow monitoring the current values of the sterilization criteria in the course of the sterilization process itself, since at the first stage only the accumulation of temperature values in the memory device is carried out, and the processing of the obtained values and the calculation of the criterion is performed at the second stage, as a rule, at the end of the process sterilization. In addition, the known device does not allow to set the desired (required) value of the sterilization criterion and to record the time when this value is reached.

The aim of the invention is to improve the accuracy of the control.

Claims (1)

10 The goal is achieved by the fact that a device for monitoring the sterilization process, containing a temperature sensor connected to a voltage-voltage converter and an analog-digital converter, connected in series, a clock generator, a code converter, a sterilization criterion indicator, is additionally equipped with a unit comparison, setpoint adjuster, the sterilization criterion and the process termination indicator, while the outputs of the analog-digital converter are connected through a code converter with an indicator of the sterilization criterion value and a comparator unit, the input of the latter is connected to the setpoint setter of the sterilization criterion, and the output through the signal conditioner is sterile with the process end indicator, the clock generator is connected to the inputs of the analog-digital converter and the code converter. The drawing shows a functional diagram of the device. A device for monitoring the sterilization process contains a temperature sensor installed in a tank (not shown), connected by bus 1 to the voltage-resistive converter 2 and the analog-digital converter 3 connected in series, clock generator, code converter 4, indicator 5 values of the sterilization criterion, comparison unit 6, unit 7 of the established value sterilization criteria, signal generator 8 "Sterile, associated with the process termination indicator 9, at this The signal conditioner is “sterile via tires 10 connected to an actuator, for example to a steam flow controller. In the device, the code converter is designed as a computing unit that converts the temperature code into a sterilization criterion code, the sterilization criterion values corresponding to the values of the coding table calculated by the formula determining the sterilization criterion value for microbiological industries. Ai Aepr -E / RT (-.- A-ti, where is DT; 1.1-1 is the time during which the temperature T can be considered constant; T (T, -) is the temperature at time i; Aj - value of sterilization criterion 3 time point i; n - 1, 2, 3 For example, for heat-resistant spores of Bacterium Stearothermophilus A c, E 282,486 kJ / mol. The selected time interval (Alj) depends on the specific conditions of the sterilization process and on the permissible degree accuracy. For microbial production conditions, the required accuracy is achieved at A1 | (p 30 s. The comparison unit is designed as a differential The setter of the achieved sterilization criterion and the setpoint. The setpoint adjuster of the sterilization criterion is made in the form of three ten-position switches, with which, in a known range, the set value of the sterilization criterion is set.The device operates as follows.The temperature signal on buses 1 goes to the impedance converter 2 voltage from which a constant voltage, proportional to temperature, is supplied to analog-to-digital converter 3, from the output of which A thirteen-bit binary code of the temperature on the converter 4 of the code, where the temperature code is converted into the sterilization criterion code V, is summed up and then supplied to the indicator 5 of the current values of the criterion and block 6 with the setting unit 7. When the current value of the sterilization criterion set by the setting unit is reached, the comparison unit outputs the signal to the signal conditioner is “Sterile, which, in its turn”; d, forms a signal that arrives at the process terminator 9 and the actuator through the tongue 10. The expected effect is the device automatically allows to measure, monitor and control the sterilization process, increases the accuracy of control of the sterilization process and provides clarity flow of this process. The error of this device does not exceed 15-20 ° / o. The economic effect is achieved by saving energy costs (steam), reducing sterilization time, and also by improving the accuracy of measuring the sterilization criteria. Apparatus of the Invention A device for monitoring a sterilization process, comprising a temperature sensor connected to a voltage-voltage converter and an analog-digital converter connected in series, a clock generator, a code converter, a sterilization criterion value indicator, a code converter, a sterilization criterion indicator, characterized by in order to increase the accuracy, it is equipped with a comparison unit, a set value setter, the criteria for sterilization and signalization The end of the process, the outputs of the analog-digital converter are connected via a code converter with a sterilization criterion value indicator and a comparison unit, the last input is connected to a set sterilization criterion setter, and the output is through a "End of process indicator, and the clock generator is connected to the outputs of the analog-digital converter and the code converter. . Sources of information taken into account in the examination 1. Patent of Germany No. 2456663, cl. G 01 F 15/46, 1977. / h - - / h   m /