Difference between Data Highway and Data Highway plus
The Data Highway and Data Highway plus systems are Local Area Networks (LANs). They connect programmable controllers, computers, and other devices so they can communicate...
Author : Areej
Difference between Inverse Time Circuit Breakers and Instantaneous Trip Circuit Breakers
Inverse Time Circuit Breakers Inverse time circuit breakers have both thermal and instantaneous trip features and are preset to trip at standardized levels. This is...
Difference between profibus and foundation field bus
Profibus ProfiBus (PROcess FIeld BUS) is a widely accepted international networking standard, commonly found in process control and in large assembly and material handling machines....
Introduction to Industrial Ethernet
Industrial Ethernet Early Ethernet systems (of the 10 Mbps variety) use the CSMA/CD access method. This gives a system that operates with little delay if...
How to convert mA signal into % in instruments?(ie 4-20 mA=0 to100%)
Example calculation: controller output to valve An electronic loop controller outputs a signal of 8.55 mA to a direct-responding control valve (where 4 mA is...
Introduction to some important pneumatic components
Main pneumatic components All main pneumatic components can be represented by simple pneumatic symbols. Each symbol shows only the function of the component it represents,...
PRESSURE SPRING THERMOMETERS
Introduction The construction and mechanical operation of all types of pressure spring thermometers are identical. The thermal system of pressure spring thermometer contains a metal...
Procedures to do before starting up and shutting down a differential pressure transmitter
Installation: After installation and before start up of the differential pressure transmitter, be sure to perform the following checks and procedures. Preparation: (1) Check for...
Difference between filled impulse line and purged impulse line
Filled impulse lines An alternate method for isolating a pressure-sensing instrument from direct contact with process fluid is to either fill or purge the impulse lines with a harmless...
Different types of calibration
Definition and Need for Calibration According to Webster’s Dictionary, calibrate means “to check, adjust, or standardize systematically the graduations of a quantitative measuring instrument.” As...