What is Instrumentation?
The first question that popped up in my mind and raised to our professor during the first day of my instrumentation classes was that what is Instrumentation and how is it being used in process control? “Simple, these are instruments that we use in order to measure, satisfy and complete a given sequence that will control the process required ” my professor replied. then I taught, Duh! Instrumentation is not that complicated and might be a boring subject but then when he goes along introducing the different kinds of instruments that are involve in the process, then I started to get interested and eventually loved the subject.
Then I started reading books to expand my knowledge on what instrumentation really does in process control. Instrumentation is actually the art of measuring the value of process parameters namely pressure, flow, level and temperature to name a few and supplying a signal that is proportional to the measured parameter. The output signals are standard signal and can then be processed by other equipment to provide indication, alarms or automatic control. There are a number of standard signals; however, those most common that we use are the 4-20 mA electronic signal and the 20-100 kPa pneumatic signal.
Sensors to measure speed, pressure, flow, level and temperature and valves to influence their behaviour and more complex instruments are what we are talking about here. Below are the different types of instruments that are essential for all aspects of processes control. Further explanation, types and theory of each item will be explained in each separate article. just click on the types of instument to read more.