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Industrial Instrumentation Questions, Instrumentation Questions For You, Instrument Questions & Answers, Instrumentation Tools Questions.

Diagnosing Electric Motor Circuit

S Bharadwaj Reddy
Suppose the electric motor refuses to run when the “Run” pushbutton switch is pressed. A technician begins diagnosing electric motor circuit following the steps shown (in order): Test 1: Measured 12...

Questions on Pneumatic Control Loop

S Bharadwaj Reddy
Examine these two pneumatic control loops (transmitter-controller-valve systems) for an industrial boiler, controlling both water level and steam pressure: Pneumatic Control Loop If the PIC setpoint is 225 PSI and...

Process Control Loop Testing

S Bharadwaj Reddy
A very useful technique for testing process control loop response is to subject it to a “step-change” in controller output. In other words, the process is perturbed (the highly technical...

Identify Level Control Loop Tuning Problems

S Bharadwaj Reddy
A level control loop is supposed to maintain a constant level of liquid at the bottom of the stripping tower where considerable amount of vibration exists, but it seems to have...

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