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Instrumentation is the science of automated measurement and control. Applications of this science abound in modern research, industry, and everyday living. From automobile engine control systems to home thermostats to aircraft autopilots to the manufacture of pharmaceutical drugs, automation is everywhere around us. This piece will focus on the fundamental principle of measurement terminology.
The objective of any measurement endeavour is to be able to measure a given process variable in order to possibly control it. Hence what you cannot measure, you cannot control.
Instruments are used to measure and control the condition of process streams as they pass through a Plant. Instruments are used to measure and control process variables such as: Temperature; Flow; Level; Pressure; Quality. Automatic instrument control systems are most commonly used to continually monitor these process conditions and correct them, without operator intervention, if there is a deviation from the process value required. The main reason for using automatic controls is that production is achieved more economically and safely. In fact, some of our processes could not be controlled in a stable condition without automatic control systems.
