F-value Computation for the Sterilization Process for Pharmaceutical and Chemical Products


When sterilizing preserved foods by heating, bacteria must be completely annihilated without changing the heat of the product (a degradation of the taste) and the integrated fatality (F value) must be recorded and monitored. By using the computation function of the SMARTDAC+ series Paperless recorder GX/GP (relational computation, four arithmetical operations, and exponential computation), the F value can be calculated and recorded.

Setting example


  • The F value at a specified sterilization temperature is automatically computed and recorded as production data.
  • Using external input contact, recording can be started or stopped automatically.
  • Automatic data file transfer and WEB monitoring are available.

F value

“F value” is The integrated fatality of the bacteria obtained by heat sterilization.  It is the integrated value of the fatality rate (Li) of the bacteria per unit amount of time (Δt),  and Li is a function of the sterilization temperature.

F value computation


Configuration Example on the SMARTDAC+

Ex. Sterilization temp. Tr=121.1degC, Z value Z=10degC,
      Measurement interval Δt=0.0167min(=1sec)

  • Constant
    K1=10, K02=10.0degC(Z value), K03=121.1degC(Sterilization temp.), K04=0.0167min(measurement Interval), K05=100degC(measurement interval)
  • Constant K2 to K5 may vary depending on the conditions.
  • Equations
    Measurement channel 0001
    MATH channel A001: K01**((0001-K03)/K02) ←Li value
    MATH channel A002:(A002+A001*K04)*(0001.GT.K05) ←F value

*When the temperature falls to 100℃, the value of A002 is reset to 0.

Temperature monitoring for HACCP

In HACCP, the temp. management is required for the whole food supply chain (ex. Food manufacturing, processing, cooking, and sales). SMARTDAC+ series can record multiple points of temp. in production lines, facilities or environment of storage …etc.
It provides strong supports for your temp. management.

Temperature monitoring for HACCP


  • 制药


  • 食品和饮料




  • 按钮操作式DX1000/DX2000

    Daqstation DX1000/2000系列是带显示的数据采集系统。HMI支持工业应用、审计跟踪和符合FDA 21CFR Part11高级安全性的自定义图形。

  • 触屏式GX10/GX20

    SMARTDAC+TM GX10/GX20 是一款多点触屏记录仪,提供直观以人为本的设计,支持Web功能,具有可扩展的体系结构。


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