Charting Parameters With Different Units

A simple chart cannot be used to display a pressure of 1E-5 mbar and a temperature of 200°C because the temperature will just be a flat line at the bottom of the chart. In recent years, we have used 4 different ways of getting round this problem. One such solution is shown below, where we have:

  • 2 y-axes (left and right) with the ability to select which parameters are plotted on each (using drop-down menus above each axis).
  • The ability to define the time-frame on-the-fly by use of the scrollbar and “timebase” control
  • Display of “recipe steps” in the coloured bar below the chart
  • Ability to switch to previous (“historical”) data and back to “live” data

chart