Measurements

Measurements are required for

• monitoring
• analyzing
• controlling

processes and operations.

Monitoring

• measured and indicated quantities not included in control or data acquisition systems  

Examples - thermometers, anemometers, electricity meters, water meters, barometers ...

Analyzing

• measured quantities included in data acquisition systems

Examples - values used in statistical models like historical weather, values used to build empirical models like weather forecasts ...

Controlling

• measured values used in control systems

Examples - thermostat to switch on/off an electric heater, pressure-sensor used in an oil-refinery to control compressors