Understanding Process Measurement

What are the common techniques used for pressure measurement?

• Flow meters

• Voltage meters

• Thermometers

• Manometers, piezometers, pressure transducers, barometers

How often should measurement devices be calibrated?

• Calibration is not required if the device appears to be working.

• Calibration should be done every month regardless of usage.

• Calibration should be done annually or more frequently based on usage and manufacturer guidelines.

• Calibration is only necessary every five years.

What role does instrumentation play in process control?

• Instrumentation is primarily for aesthetic purposes in process design.

• Instrumentation is essential for monitoring and controlling process variables in process control.

• Instrumentation has no impact on process efficiency.

• Instrumentation is only used for data storage in process control.

Describe the working principle of a Bourdon tube pressure gauge.

• A Bourdon tube pressure gauge uses a digital sensor to measure pressure.

• A Bourdon tube operates by filling a liquid-filled chamber to indicate pressure.

• A Bourdon tube measures temperature by expanding a metal rod.

• A Bourdon tube pressure gauge measures pressure by converting the deformation of a curved tube into a dial reading.

What are the advantages of using ultrasonic level measurement?

• Requires frequent calibration

• High cost of installation

• Advantages of using ultrasonic level measurement include high accuracy, non-contact measurement, suitability for various materials, reliability, and low maintenance.

• Limited to specific materials

What factors can affect the accuracy of pressure measurements?

• Temperature variations, calibration errors, atmospheric conditions, contaminants, and measurement methods.

• Humidity levels

• Wind speed

• Color of the measuring device