Pneumatic Level Transmitter Calibration Table
A pneumatic level transmitter has a calibrated range of 0 to 5 feet, and its output signal range is 3 to 15 PSI. Complete the following table of values for...
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Determine Resistance value of Resistors
Determine the nominal resistance values of these resistors, given their band colors, and also express the allowable tolerance in ohms (i.e. what the minimum and maximum acceptable resistance values are...
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 display does not match the display of the hand-held pH...
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 input range of 4 to 20 mA. Complete the following...
Diagnosing Electric Motor Circuit
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
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...
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 a hill stores fresh water for a town’s drinking needs....
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 Practice Questions Explain why the TSH uses a normally-open contact...
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. In other words, the process is perturbed (the highly technical...
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 considerable amount of vibration exists, but it seems to have...