Instrument Inspector Interview Questions and Answers

The standard height of instrument installation varies depending on the type of instrument and its application.

• The height should be such that the instrument is easily accessible for operation and maintenance.

• For example, the height of a pressure gauge in a pipeline should be at eye level for easy reading.

• Instruments installed in hazardous areas should be placed at a safe distance from potential sources of ignition.

• The height of instruments in control rooms should be such that ...read more

The gap between electrical tray and instrument tray depends on various factors such as safety regulations, equipment requirements, and installation specifications.

• The gap between electrical tray and instrument tray is typically determined by safety regulations and codes.

• It is important to maintain a sufficient gap to prevent any electrical interference or damage to the instruments.

• The specific gap requirement may vary depending on the type of instruments and electrical equipm...read more

Cable testing involves checking the integrity and functionality of cables used in electrical systems.

• Inspect the cable for any physical damage or wear and tear

• Check the continuity of the cable using a multimeter

• Perform insulation resistance testing to ensure the cable is not short-circuited

• Use a cable fault locator to identify any faults or breaks in the cable

• Perform a high voltage test to ensure the cable can withstand the required voltage

• Document the results of the testing ...read more

A pressure transmitter works by converting the pressure of a fluid into an electrical signal.

• Pressure from the fluid acts on a diaphragm inside the transmitter

• This causes a change in resistance, capacitance, or voltage

• The change is then converted into an electrical signal that represents the pressure

• The signal is sent to a control system for monitoring or control

• Example: A pressure transmitter in a boiler system measures the steam pressure and sends the signal to the control ...read more

RTD stands for Resistance Temperature Detector, which measures temperature by changes in electrical resistance.

• RTD works on the principle that the electrical resistance of a metal increases with temperature.

• The RTD sensor is made of a pure metal, such as platinum, nickel, or copper.

• The resistance change is measured using a Wheatstone bridge circuit.

• RTDs are commonly used in industrial applications for accurate temperature measurement.

• Example: A platinum RTD sensor has a resis...read more