DWC Thermal Analyser - Professional Manual

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Importing Raw Data Files:

 

Initial Importing Procedure:

In order to import data into DWC Thermal Analyser – Professional you need to:

  1. Open DWC Thermal Analyser - Professional.

  2. A screen will appear asking for the file you wish to open. Select the desired file and click Open. Note: File Format is originally set to display Excel files; this will need to be changed for DAT and TAB files.

  3. Once the data file has been opened, it will be imported into DWC Thermal Analyser - Professional, whereby a list of importing options is presented.

For further assistance, click on the support video link.

 

Importing options:

During initial importing of data, DWC Thermal Analyser - Professional displays a list of File Options, and Default Thermal Processing Values (as shown below), relevant to the data-set.

The Import File Options are default set as a sterilisation process. When the Reference Temperature and Z value are changed in accordance to an alternate processes such as pasteurisation or minimal processing, DWC Thermal Analyser - Professional will refer to the F value as an Fp value throughout the program.



At the commencement of importing data, a list of File Options and Default Thermal Processing Values are displayed.

  1. Number of Probes to import (leave blank for all): This allows the option to import a selected number of probe data columns. For example, if the number 3 was inserted, then only the first three probe data columns would be imported.

  2. Reference Temperature and Z value: Initially, the Reference Temperature and Z values are set at 121.1 °C and 10.0 °C respectively, which denotes a low acid, sterilization thermal process in which case the F value will be displayed as an Fo value. These can be changed to suit the thermal process delivered. For example, for a pasteurisation process, the Reference Temperature can be changed to 90.0 °C and the Z value can be changed to 9.0 °C simply by clicking in the space provided, deleting the existing temperature values and inserting the new temperature values. In this case the F value will be displayed as an Fp value.

  3. Processing Temperature: For temperature distribution trials, the set temperature of the retort should be input, however for process evaluation trials, in order for DWC Thermal Analyser - Professional to calculate F values for each probe using the Mathematical Method, the scheduled process temperature may need to be amended to the correct process temperature (actual retort temperature). For example, the scheduled retort temperature might be 122.0 °C however, due to the inclusion an offset of + 0.7 °C; the actual temperature would be 122.7 °C. The easiest method of locating the actual retort temperature is in the Data Block. This can be achieved by taking the average of the retort temperature during the hold phase.

  4. Scheduled Hold Time: The scheduled hold time that was recorded during the thermal process to be inserted here.

  5. Come-up Time: The come-up time that was recorded needs to be inserted here. Note, the actual come-up time for the trial needs to be inserted, not the scheduled come-up time as these may occasionally differ.

  6. Number of Seconds Between Readings: The default setting here is 30 seconds, this needs to be changed according to the data-set’s time/scan interval. For example, if the data was recorded at 1.0 minute intervals, then this needs to be changed to 60 seconds.

  7. Data File Time Format: This option is dependent on the time/scan setup of the raw data.
    1. Standard Excel Time Format: This format involves the first column of the data following the Excel time format.
    2. Reading Numbers: This format involves the first column of data representing the data scan/reading. i.e. 1, 2, 3, 4 etc.
    3. Number of Minutes: This format involves the first column of data representing the accumulative number of minutes throughout the trial.
    4. Number of Seconds: This format involves the first column of data representing the accumulative number of seconds throughout the trial.

  8. First Row of Table Contains Probe Labels: This option is set as checked (default), if the first row of the data-set does not include the probe labels, but instead is the first recorded data, this option needs to be unchecked.

  9. Fo Data in Every Second Column: If the data that is being imported is temperature only, this option remains unchecked. However, if the data also contains Fo values in every second column, this option needs to be checked, otherwise DWC Thermal Analyser - Professional will assume that the Fo column is a probe data column.

  10. Once completed, click OK. DWC Thermal Analyser - Professional will take approximately 5 - 10 seconds to analyse and compute the data.

Below are examples of low acid sterilisation and pasteurisation thermal process values for the Import File Options.

Example of an Import File Options for a sterilised product which had an 18.0 minute come-up time followed by a 24 minute scheduled hold at 122.0 °C, (122.7 °C actual).


Example of an Import File Options for a pasteurised product which had a 15.0 minute come-up time followed by a 30 minute scheduled hold at 101.0 °C.

For further assistance, click on the support video link.

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