An overview of the multivariable measurement technology
What is the multivariable measurement?
The measurement of multiple process variables in one instrument in order to accurately measure volume as well as mass flow through appropriate flow compensation. The use of multivariable measurement simplifies complexity.
The use of multivariable measurement is growing faster than the single variable measurement in industrial process applications
The above image is heat exchanger control is a typical example of multivariable technology.
Measurement points are increasing as process plants become bigger and more complex, putting higher demands on the plant operations and maintenance personnel. Multivariable measurement is emerging as a viable solution for this challenge helping to reduce cost and improve efficiency by optimizing the number of instruments in the plant.
What are the benefits of multivariable measurement?
• Faster calculations of flow rate, differential pressure etc.
• Predictive maintenance can be done based on device wear and tear algorithm to avoid unscheduled downtime.
What are the potential applications of multivariable measurement?
• Oxygen flow measurement in the furnace in the glass industry
• Natural gas flow measurement
• Steam flow measurement in dryers and rollers in pulp & paper industry
• Waste gas flow in oil and gas refineries
Recent trends in multivariable technology
Recent developments in this technology offer scope for wider adoption in the industry.
• For pressure measurement faster flowrate calculation and improved dynamic response.
• For temperature measurements, flexible input from RTD /thermocouple can be given.
• Local graphic design with real-time trending and diagnostics.
Challenges in implementing
• Application selection
• Location/installation mounting requirements
• Defining the performance and functional requirements
• Flow element selection and sizing
• Temperature sensor selection to suit the application
• Selecting the appropriate multivariable device
• Calibration and configuration
• System integration
• Lifecycle management