Fieldbus Analog Input Function Block
The Analog Input (AI) function block processes field device measurements and makes them available to other function blocks. The output value from the AI block is in engineering units and…
Introduction to Fieldbus Function Blocks
Introduction A fieldbus system is a distributed system composed of field devices and control and monitoring equipment integrated into the physical environment of a plant or factory. Fieldbus devices work…
Difference Between Absolute and Gauge Pressure
Pressure can be described as the force applied to an area. There are many different systems of pressure measurement, with absolute pressure and sealed gauge pressure being two of the…
Humidity Measurement Principle
Humidity measurement is an important tool for predicting the climate outdoors as well as controlling the climate indoors. Humidity control is especially important in living, storage, and manufacturing sites. Definitions…
Pressure Switch Terminology
Pressure switches are very popular and important in plant control and instrumentation. They are mainly used in control circuits and power circuits. This piece will discuss common terminology associated with…
Differential Pressure Switch Principle
The Differential Pressure Switch just like the pressure switch is a simple electro- mechanical device that operates on the basic principles of Levers and opposing forces. They are mainly used…
What is Double Block and Bleed Valves?
What is Double Block and Bleed Valves ? API 6D defines a double-block-and-bleed valve (DBB) as a "single valve with two seating surfaces that, in the closed position, provides a…
Zone vs Class / Division
In 1947, the NEC first recognized different levels of risk exist in hazardous locations.Consequently, it established Division 1 and Division 2, to provide a means to treat the issue. This…
Important Factors Consider during Piping Design
Tubular products are termed ‘tube’ or ‘pipe’. Tube is customarily specified by its outside diameter and wall thickness, expressed either BWG (Birmingham wire guage) or in inches or in thousands.…
Basics of Loop Powered Devices
What are Loop Powered Devices? A lot of loop setups will utilize an external power supply in order to power the devices which are attached to the current loop. It…
