Integrating Processes – Liquid Level Control
A good example of an integrating process is liquid level control, where either the flow rate of liquid into or out of a vessel is constant and the other flow rate varies. If a control valve is opened in a step-change fashion, liquid level in the vessel ramps at a rate proportional to the difference in flow rates in and out of the vessel. The following illustration shows a typical liquid level-control installation, with a process trend showing the level response to a step-change in valve position (with the controller in manual mode, for an “open-loop” test): It is critically
Liquid Level Control using Flow Loop - InstrumentationTools
Since liquid level can only change in a vessel if there is an imbalance of inlet and outlet flow rates, would this system achieve level control?
Lubrication Control System - Turbo Alternator
A control system is used in a turbo alternator to regulate the lubrication oil flow, pressure, and temperature.
Turbine Speed Control system using Woodward Governor
In this article, we will study turbine speed control system using the Woodward governor 505.
Background of Modbus - ASCII and RTU Data Frames
Modbus protocol exchanges process data between industrial control devices. Learn the background, ACSII and RTU Data frames format.
PID Controller Loop Tuning Questions and Answers
This article provides PID controller loop tuning conditions for different conditions to analyze Process Variable, Set Point and Controller Output trends.
Factors for Setting Alarm Levels on Toxic Gas Detectors
Various factors considered when setting alarm levels on toxic gas detectors to minimize the risk of potentially dangerous exposure levels to personnel.
What is Photoionization Detector (PID)? - InstrumentationTools
Photoionization Detector (PID) uses ultraviolet light to ionize the measured gas. The sensor measures ion current to determine gas concentration.
Control Valve Failure Rate Calculation | Instrumentation Tools
Suppose an average of 15 failures for every 200 control valves in service over the 5-year period, calculate the Control Valve Failure Rate.
HART Communication Tutorial Part 5
APPLICATION IN SCADA The technology used in HART is very useful for SCADA applications. Since HART supports digital process values, it can be applied in SCADA. Various status parameters of PVs obtained from HART measurements can be used to schedule field trips for preventive maintenance. This would result in less downtime and less employment of manpower. SCADA applications require updating field data in minutes. Since data updating using HART requires only a fraction of a second, it can very safely be applied in SCADA applications. Other application areas where HART can be applied in SCADA are inventory management, automated meter
Instrumentation Tools
Telugu Automation School