Petrofac Instrument Engineer Interview Questions and Answers

Different types of level instruments can be used in different applications depending on the requirements.

• For continuous level measurement, ultrasonic level sensors can be used.

• For point level detection, capacitance level switches can be used.

• For high-temperature applications, guided wave radar level sensors can be used.

• For corrosive or aggressive liquids, magnetic level gauges can be used.

• For level measurement in open

A transmitter is a device that converts a signal from a sensor into a standardized output signal for measurement or control purposes.

• Types of transmitters include pressure transmitters, temperature transmitters, level transmitters, and flow transmitters.

• Functions of transmitters include sensing a physical parameter, converting it into an electrical signal, and transmitting the signal to a control system.

• General configu...read more

Instruments used in control and instrumentation include sensors, transmitters, controllers, and actuators.

• Sensors: devices that detect changes in physical properties and convert them into electrical signals (e.g. temperature sensors, pressure sensors)

• Transmitters: devices that send signals from sensors to controllers (e.g. signal transmitters)

• Controllers: devices that receive signals from sensors and transmitters to re...read more

PID loop is a control system feedback mechanism used in industrial processes to maintain desired setpoints.

• PID stands for Proportional, Integral, Derivative

• Proportional term responds to the current error

• Integral term corrects past errors

• Derivative term predicts future errors

• PID controller continuously calculates an error value as the difference between a desired setpoint and a measured process variable

• Example: PID loop...read more