TYPES OF PRESSURE: When and why are they used?
Automation is a key of rapid industrial development in 21st century and process control is an integral aspect of automation. Process control is extensively used in applications where bulk production is carried out in a consistent manner. It includes wide range of application area such as chemical & mechanical processes, food & goods packaging industry, power plants, oil & petroleum refineries and much more. A fundamental requirement of any of these process environments is an accurate and precise measurement. Good measurement practices along with consistent and reliable measurement systems maintain the defined level of accuracy and ultimately direct to the expected outcome. Clear and systematic way of expressing the entities under measurement is needed to analyze the outcome and take necessary control action. Most of the process control applications use ‘pressure’ as a core entity of measurement and regulation. Pressure measurement products provide solution to almost every application need. Pressure sensors find their use in countless number of everyday ordinary applications. They are also used in indirect form for measuring other variables such as fluid level, fluid flow, speed etc. Therefore, it is important to understand the basic concepts of pressure for interpreting various ways of its measurement and related applications. The simplest definition of pressure says it is a measure of the force applied on an object which is perpendicular to the surface and distributed equally. This definition applies to solids whereas fluid pressure is nothing but force exerted per unit area by fluid. Going further, various units of pressure […]