pH Transmitter Problem
A newly-installed pH transmitter does not seem to be measuring the pH of the process liquid accurately. The indicating controller’s
Practical Questions
In Practical Instrumentation Questions section, you will get industry related technical questions with problem solving approach,
Current-to-Pressure Transducer Calibration Table
Suppose you wish to calibrate a current-to-pressure (“I/P”) transducer to an output range of 3 to 15 PSI, with an
Diagnosing Electric Motor Circuit
Suppose the electric motor refuses to run when the “Run” pushbutton switch is pressed. A technician begins diagnosing electric motor
Questions on Pneumatic Control Loop
Examine these two pneumatic control loops (transmitter-controller-valve systems) for an industrial boiler, controlling both water level and steam pressure: Pneumatic
Identify Instrumentation Terms in Water Supply System
You have to Identify Instrumentation Terms in Water Supply System in this example problem. A water reservoir located high on
PLC Practice Questions
Explain what the following PLC Practice Questions on “ladder-logic” circuit does, and identify the meaning of each symbol in the diagram: PLC
Process Control Loop Testing
A very useful technique for testing process control loop response is to subject it to a “step-change” in controller output.
Identify Level Control Loop Tuning Problems
A level control loop is supposed to maintain a constant level of liquid at the bottom of the stripping tower where
PLC Permissive for Motor Control
A engineer needs to write a PLC program to control a water pump driven by an electric motor. This water
Process Control High Level Alarm Fault Analysis
An operator reports a high level alarm (LAH-12) displayed at the control room for the last 13 hours of operation,
