100+ Instrumentation Technician Interview Questions and Answers

As an instrumentation technician, I am skilled in troubleshooting, repairing, calibrating, and testing various types of process control instruments.

• I have experience in identifying and diagnosing problems with instruments and determining the appropriate solutions.

• I am proficient in repairing and replacing faulty components and ensuring that instruments are functioning properly.

• I am knowledgeable in calibrating instruments to ensure accurate readings and maintaining proper doc...read more

A pressure switch is used to monitor and control pressure levels in a system.

• Connect the pressure switch to the system using appropriate fittings

• Set the switch to the desired pressure range

• Calibrate the switch if necessary

• Monitor the switch for any changes in pressure and adjust as needed

DCS stands for Distributed Control System and PLC stands for Programmable Logic Controller.

• DCS is a control system used to control and monitor industrial processes, such as power plants and chemical plants.

• PLC is a digital computer used to automate electromechanical processes, such as assembly lines and robotic devices.

• DCS is designed to control multiple processes across a large area, while PLC is designed to control a single process or machine.

• DCS uses analog signals to comm...read more

Transmitters used in instrumentation include LT, PT, FT, DPT, RADAR, and MASS FLOW.

• LT - Level Transmitter measures the level of a substance in a tank or container.

• PT - Pressure Transmitter measures pressure in a system.

• FT - Flow Transmitter measures the flow rate of a substance in a pipe or channel.

• DPT - Differential Pressure Transmitter measures the difference in pressure between two points.

• RADAR - Radar Transmitter uses radar technology to measure level, distance, or speed....read more

A PLC panel wiring diagram is a visual representation of the electrical connections and components in a programmable logic controller panel.

• A PLC panel wiring diagram shows the layout and connections of various components such as power supplies, input/output modules, relays, and sensors.

• It helps technicians understand how the electrical signals flow within the panel and how different devices are interconnected.

• The diagram includes symbols and labels to represent different com...read more

Near miss is a potential accident that did not result in injury or damage, accident is an unplanned event that results in injury or damage, incident is any event that disrupts normal operations.

• Near miss is a close call where an accident almost happened but was avoided.

• Accident is an unplanned event that results in injury, damage, or loss.

• Incident is any event that disrupts normal operations, regardless of outcome.

• Examples: Near miss - Almost tripping over a loose cable, Acci...read more

A transmitter is a device that converts a physical quantity into an electrical signal for transmission.

• Transmitters are used in various industries such as oil and gas, chemical, and manufacturing.

• They are used to measure and transmit physical quantities such as temperature, pressure, flow, and level.

• The working principle of a transmitter involves converting the physical quantity into a proportional electrical signal using a sensing element and signal conditioning circuitry.

• Ex...read more

RTDs and thermocouples are both temperature sensors, but they differ in terms of principle, accuracy, range, and cost.

• RTD stands for Resistance Temperature Detector, while thermocouple is a temperature sensor based on the Seebeck effect.

• RTDs are more accurate and have a higher temperature range compared to thermocouples.

• RTDs are more expensive than thermocouples.

• RTDs have a linear relationship between resistance and temperature, while thermocouples have a non-linear relations...read more

An instrument is a device used to measure, control, or manipulate variables in a system.

• Instruments are commonly used in various industries such as manufacturing, research, and healthcare.

• They can measure physical quantities like temperature, pressure, flow rate, and electrical signals.

• Instruments can also control processes by adjusting variables based on feedback.

• Examples of instruments include thermometers, pressure gauges, oscilloscopes, and control valves.

To calibrate FIT, PIT, TIT, PDIT, LIT, PG, and TG, one needs to follow specific procedures and use calibrated equipment.

• Use calibrated equipment such as pressure gauges, thermometers, and flow meters

• Follow the manufacturer's instructions for calibration procedures

• Ensure that the instrument is clean and free from any debris or contaminants

• Perform a zero and span calibration to ensure accuracy

• Record all calibration data and compare it to previous calibration records

• Perform regu...read more

Emergency light system is a backup lighting system that automatically turns on during power outages or emergencies.

• Emergency light system provides illumination in case of power failure or emergency situations.

• It is typically installed in buildings, such as offices, hospitals, schools, and public spaces.

• The system consists of battery-powered lights that are connected to a central control panel.

• During normal operation, the lights are off and the batteries are charged.

• When the m...read more

There are various types of pressure gauges used in different industries.

• Mechanical pressure gauges: These gauges use mechanical elements like springs or Bourdon tubes to measure pressure.

• Digital pressure gauges: These gauges provide a digital readout of pressure and often have additional features like data logging.

• Differential pressure gauges: These gauges measure the difference in pressure between two points.

• Absolute pressure gauges: These gauges measure pressure relative to...read more

A thermocouple is a temperature sensor that consists of two different metals joined together at one end.

• It generates a voltage proportional to the temperature difference between the two junctions.

• It is commonly used in industrial and scientific applications to measure temperature.

• Different types of thermocouples are available, each with its own temperature range and accuracy.

• Examples of thermocouple types include K, J, T, and E.

• Thermocouples are often used in conjunction with...read more

Earthing is the process of connecting electrical equipment to the earth to prevent electric shock. Fire alarm is a device that detects and alerts people to the presence of fire.

• Earthing is important to prevent electric shock and ensure safety in electrical systems

• It involves connecting the metal parts of electrical equipment to the earth using a conductor

• Fire alarm is a device that detects smoke or fire and alerts people to evacuate the building

• It can be a standalone device o...read more

Calibration of instruments inside furnace is crucial for accurate readings and safe operation.

• Calibration should be done regularly to ensure accuracy

• Instruments should be calibrated according to manufacturer's instructions

• Calibration should be done in a controlled environment to minimize errors

• Examples of instruments inside furnace that need calibration include temperature sensors, pressure gauges, and flow meters

A pressure control valve is a device used to regulate and control the pressure of a fluid within a system.

• Pressure control valves are commonly used in industrial processes and systems.

• They are designed to maintain a specific pressure level by adjusting the flow rate of the fluid.

• These valves can be manually operated or automated, depending on the application.

• They are often found in hydraulic systems, pneumatic systems, and gas pipelines.

• Pressure control valves can protect equ...read more

A combined-cycle power plant is a type of power plant that uses both gas and steam turbines to generate electricity efficiently.

• Combines gas turbine and steam turbine in one plant

• Gas turbine generates electricity by burning fuel and spinning a generator

• Waste heat from gas turbine used to produce steam for steam turbine

• Steam turbine generates additional electricity

• Higher efficiency compared to traditional power plants

These are common instruments used in the field of instrumentation for measuring temperature, flow, and safety area classification.

• RTD stands for Resistance Temperature Detector and is used to measure temperature by sensing changes in electrical resistance.

• Thermocouples are temperature sensors that work based on the principle of two dissimilar metals producing a voltage proportional to the temperature difference.

• Flow transmitters are used to measure the flow rate of a fluid in...read more

An instrument name refers to the specific type or model of an instrument used in the field of instrumentation technology.

• Instrument names can vary depending on the industry and application.

• Examples of instrument names include pressure transducer, temperature controller, flow meter, pH meter, etc.

• Instrument names help identify the purpose and functionality of the instrument.

• Different instrument names may require different calibration and maintenance procedures.

RTD (Resistance Temperature Detector) works on the principle of change in electrical resistance with temperature.

• RTD measures temperature by sensing the change in electrical resistance of a metal wire or film.

• As the temperature increases, the resistance of the RTD also increases.

• The most common type of RTD is made of platinum (PT100) and has a resistance of 100 ohms at 0 degrees Celsius.

• RTDs are highly accurate and stable temperature sensors used in various industries such as...read more

MOS stands for Metal Oxide Semiconductor. It is a type of transistor used in electronic devices.

• MOS is a type of transistor that is commonly used in electronic devices.

• It is made up of a metal gate, oxide insulator, and semiconductor material.

• MOS transistors are used in digital circuits, amplifiers, and memory devices.

• Examples of MOS-based devices include microprocessors, memory chips, and LCD screens.

Pt 100 is a type of temperature sensor that uses platinum as its sensing element.

• Pt 100 is a resistance temperature detector (RTD) that measures temperature based on the resistance of platinum.

• It is commonly used in industrial and scientific applications where high accuracy and stability are required.

• Pt 100 sensors have a resistance of 100 ohms at 0°C and their resistance increases with temperature.

• They are often used in conjunction with instrumentation amplifiers to provide ...read more

A control valve is a device used to regulate the flow of a fluid in a process system by varying the size of the flow passage.

• Control valves are essential components in process control systems

• They can be operated manually or automatically

• Control valves can be used to control flow rate, pressure, temperature, or level in a system

• Examples include globe valves, butterfly valves, and ball valves

Instrumentation is the science and art of measuring and controlling variables in a process or system.

• Instrumentation involves the use of various instruments and devices to measure and monitor physical quantities such as temperature, pressure, flow rate, and level.

• It also includes the control and automation of these variables to ensure optimal performance and safety.

• Instrumentation technicians are responsible for installing, maintaining, and troubleshooting instrumentation sys...read more

I am looking for a new job opportunity that allows me to further develop my skills and knowledge in instrumentation technology.

• Seeking a position with more growth potential

• Interested in working with advanced instrumentation equipment

• Want to expand my knowledge in calibration and troubleshooting

• Desire to work in a team-oriented environment

• Looking for a company that values professional development

An analyser is a device that measures and analyzes the properties of a substance or sample.

• Analyzers are used in various industries such as chemical, pharmaceutical, and food processing.

• They can measure properties such as pH, temperature, pressure, and concentration of various substances.

• Examples of analyzers include gas chromatographs, mass spectrometers, and spectrophotometers.

Alarms and trips are used in instrumentation to alert operators of abnormal conditions and to shut down equipment to prevent damage or danger.

• Alarms are used to alert operators of abnormal conditions, such as high or low pressure, temperature, or flow rates.

• Trips are used to shut down equipment to prevent damage or danger, such as in the case of overpressure or overtemperature.

• Alarms and trips can be set to different levels depending on the severity of the condition.

• Examples ...read more

Emerson mass flow meters can be calibrated using the manufacturer's recommended procedures and tools.

• Emerson provides detailed calibration instructions in the product manual or online resources.

• Calibration typically involves adjusting the zero and span settings to ensure accurate measurement.

• Specialized calibration equipment may be required, such as a reference flow meter or calibration software.

• Regular calibration is important to maintain the accuracy and reliability of the ...read more

The output of RTD (Resistance Temperature Detector) is a change in resistance in response to a change in temperature.

• Output is a change in resistance

• Output is proportional to the change in temperature

• Output can be measured using a Wheatstone bridge circuit

Types of SOV's, gauges, and limit switches used in instrumentation.

• Types of SOV's: solenoid-operated valves, pneumatic valves, electrically-operated valves

• Types of gauges: pressure gauges, temperature gauges, level gauges

• Types of limit switches: mechanical limit switches, proximity limit switches, photoelectric limit switches

Surge protection is a measure taken to protect electrical equipment from voltage spikes or surges.

• Surge protectors are devices that divert excess voltage away from sensitive equipment.

• They are commonly used to protect computers, TVs, and other electronics from power surges.

• Surge protection can help prevent damage to equipment and data loss.

• Lightning strikes and power outages are common causes of power surges.

Instrumentation is the science and art of measuring and controlling variables in a process or system.

• It involves the use of instruments to measure and monitor various parameters such as temperature, pressure, flow rate, and level.

• Instrumentation technicians install, maintain, and repair these instruments and control systems.

• Examples of instruments used in instrumentation include sensors, transmitters, controllers, and recorders.

• Instrumentation is used in various industries su...read more

A control valve regulates the flow of fluid or gas in a system by adjusting the valve opening based on the input signal.

• Control valves have a valve body, actuator, and positioner.

• The valve body contains a plug or disc that controls the flow.

• The actuator receives the input signal and moves the valve plug or disc.

• The positioner ensures the valve is in the correct position based on the input signal.

• Control valves can be operated manually or automatically.

• Examples of control valv...read more

RTD (Resistance Temperature Detector) measures temperature by detecting changes in electrical resistance.

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

• A known current is passed through the RTD sensor and the voltage drop across it is measured.

• The resistance value is then converted into temperature using a calibration curve or equation.

• Common RTD types include platinum, nickel, and copper.

• RTDs are highly accurate and stable over a wide te...read more

A fire alarm system is a network of devices that detect and alert people to the presence of fire or smoke.

• Fire alarm systems are designed to quickly detect and warn individuals of a potential fire hazard.

• They consist of various components such as smoke detectors, heat detectors, fire alarms, and control panels.

• When a fire is detected, the system activates audible and visual alarms to alert occupants and initiate emergency response procedures.

• Fire alarm systems can be found in...read more

To calibrate an instrument, follow these steps:

• Identify the type of instrument and its specifications

• Prepare the calibration equipment and standards

• Perform the calibration procedure as per the manufacturer's instructions

• Record the calibration results and compare them with the instrument's specifications

• Adjust the instrument if necessary

• Repeat the calibration process until the results are within the acceptable range

• Label the instrument with the calibration date and results

K type thermocouple is a type of temperature sensor made of two different metals that generate a voltage proportional to the temperature difference between the two junctions.

• It is commonly used in industrial applications due to its wide temperature range (-200°C to 1350°C)

• It is inexpensive and has a fast response time

• Examples of its use include in furnaces, gas turbine exhaust, and diesel engines

The amount of celery consumed per month varies depending on personal preferences and dietary habits.

• The amount of celery consumed per month can range from a few stalks to several bunches, depending on individual consumption habits.

• Some people may eat celery as a snack every day, while others may only include it in certain recipes occasionally.

• Factors such as availability, cost, and personal taste preferences can also influence the amount of celery consumed per month.

There are three types of temperature: absolute, relative, and thermodynamic.

• Absolute temperature is measured in Kelvin (K) and is based on the movement of particles.

• Relative temperature is measured in Celsius (°C) or Fahrenheit (°F) and is based on a comparison to a reference point.

• Thermodynamic temperature is measured in Kelvin (K) and is based on the laws of thermodynamics.

• Examples of absolute temperature include the temperature of outer space and the temperature at which a...read more

To install a temperature transmitter, you need to properly mount the transmitter, connect the wiring, configure the settings, and test the transmitter.

• Mount the temperature transmitter in a suitable location near the temperature source.

• Connect the wiring according to the manufacturer's instructions, ensuring proper grounding.

• Configure the settings such as range, output signal, and calibration using the transmitter's display or software.

• Test the transmitter by comparing the di...read more

Control valves regulate the flow of fluid in a system by varying the size of the flow passage.

• Control valves have a movable element (such as a ball, butterfly, or plug) that adjusts the flow rate based on signals from a controller.

• They can be operated manually, pneumatically, electrically, or hydraulically.

• Control valves are commonly used in industries such as oil and gas, chemical processing, and water treatment.

• Examples of control valve manufacturers include Fisher, Emerson...read more

Control valves regulate the flow of fluids or gases in a process system.

• Control valves are used to control the flow rate, pressure, temperature, or level of a fluid or gas.

• They consist of a valve body, actuator, and positioner.

• The valve body contains a movable element, such as a plug or a ball, that controls the flow.

• The actuator provides the force to move the valve element.

• The positioner ensures accurate positioning of the valve based on the control signal.

• Control valves can...read more

To increase instrument performance, regular maintenance, calibration, and upgrades are necessary.

• Perform regular maintenance to ensure instruments are functioning properly

• Calibrate instruments to ensure accurate readings

• Upgrade instruments to newer technology for improved performance

• Train personnel on proper use and care of instruments

• Implement a preventive maintenance program

• Monitor instrument performance and address any issues promptly

PID controller installation involves mounting the controller, connecting it to the process, and configuring the parameters for optimal control.

• Mount the PID controller in a suitable location near the process equipment.

• Connect the controller to the process using appropriate wiring and communication protocols.

• Configure the PID parameters such as proportional, integral, and derivative gains for desired control performance.

• Tune the PID controller by adjusting the parameters based...read more

An instrument is a device used to measure, control, or regulate physical quantities such as temperature, pressure, flow, or level.

• Instruments are used in various industries such as manufacturing, chemical, and oil and gas.

• Examples of instruments include thermometers, pressure gauges, flow meters, and level sensors.

• Instruments can be analog or digital, and can be operated manually or automatically.

• Instrument technicians are responsible for installing, maintaining, and repairin...read more

A hazard is a potential source of harm or danger that could cause injury, damage, or loss.

• A hazard can be a physical condition, activity, or substance that has the potential to cause harm.

• Hazards can be classified into categories such as biological, chemical, physical, ergonomic, and psychosocial.

• Examples of hazards include slippery floors, toxic chemicals, loud noises, heavy lifting, and workplace stress.

• Identifying and mitigating hazards is important to ensure safety in the...read more

A risk is the potential of gaining or losing something of value. It involves uncertainty and the possibility of negative outcomes.

• Risk is inherent in any decision or action taken.

• It involves assessing the likelihood of an event occurring and the potential impact if it does.

• Examples include financial risks, safety risks, and health risks.