A process variable is a condition of the process fluid (a liquid or gas)that can change the manufacturing process in some way. In the example of you sitting by the fire, the process variable was temperature. In the example of the tank in Figure 7.1, the process variable is level. Common process variables include:
- Pressure
- Flow
- Level
- Temperature
- Density
- Ph (acidity or alkalinity)
- Liquid interface (the relative amounts of different liquids that are combined in a vessel)
- Mass
- Conductivity
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