A list of process variables

 Here is a short list of process variables that may appear in chemical and non-chemical processes.

These variables have the following features:

1. change in time,
2. can be measured in the field (variables measured from sampling are avoided),

The list of process variables

1. Temperature
2. Pressure
3. Level
4. Flow rate
5. pH
6. Angular velocity (rpm) [As in mixing operations]
7. Viscosity (kinematic or dynamic)
8. Density
9. Gas concentration (of CO$_2$, CH$_4$, for example) [As in an alarm setup]
10. Turbidity [A form of solid particle concentration]
11. Electrical conductivity [A form of solid particle concentration]
12. Weight
13. Voltage (for some electrochemical operations)

Any question? Write in the comments and I shall try to help.

Other stuff of interest

• LE01 - AC and DC voltage measurement and continuity test
• LE 02 - Start and stop push button installation 24V DC
• LE 03 - Turn on/off an 24V DC pilot light with a push button
• LE 04 - Latch contact with encapsulated relay for turning on/off an AC bulb light
• Ways to control a process
• What is a process variable?
• What are the most important process variables?
• Time dependence of process variables

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Ildebrando.