3 Key Trends in Pressure Measurement Technology

In general terms, the most prominent trends in the pressure measurement sector over the past 15 years have been a drive toward smaller and smaller parts, increased accuracy, and improved reliability. And these trends figure to continue in the years to come, as manufacturers leverage advances in microprocessor technology to bring key improvements in the area of pressure measurement.

3 Keys to Better Pressure Measurement
According to Elden Tolman, product development engineer for Automation Products Group, there have been three specific advances that have elevated the pressure measurement process in recent years. First, he says with the development of MicroElectroMechanical Systems (MEMS), the Wheatstone bridge can be etched directly onto a die in one solid piece, thus eliminating errors caused due to gage alignment issues. Gage alignment issues can cause low output or non-linearity. Having the gages on a single solid piece also allows for simpler assembly and less production scrap.
    
Second, Tolman says foil gage technology has also seen moderate improvements with respect to pattern design and layout. “[These improvements allow] for self-compensation when torque stresses are imposed on the diaphragm,” he says. “Improvements in both MEMS and foil gage technology have resulted in smaller packages, improved accuracy, better thermal performance, and greater long-term stability.”
    
Third, Tolman says microprocessor advances have facilitated more options and greater control in pressure measurement systems. “Signal conditioning, curve fitting, and software control of outputs from pressure transducers/transmitters and digital pressure gauges are just some examples of the possibilities through microprocessor control. In fact,” he says, “it is now possible to get a digital gauge that offers field programmable features such as auto-off, peak hold, auto zero and tare, analog outputs, unit conversion, and data logging all within the palm of the hand.”

The Need for More Accuracy
One key area of improvement in the pressure measurement segment is accuracy, as most modern-day pressure devices are far more precise than previous generations of technology. The drive toward improved pressure measurement accuracy is a product of need, as low-pressure applications that require measurement of less than five PSI are growing more prevalent. Such applications are primarily used in regulatory or lab-type conditions for remote monitoring and controlling of fluid levels in shallow tanks. For example, Tolman cites a customer that uses a five PSI digital pressure gauge with a remote sensor at the end of 20-foot cable to measure the level in underground fuel tanks at gas stations.

This is the first part of a two-part article on pressure measurement. To read the second part, "Pressure Measurement Spec & Install Best Practices," click here.

Matt Migliore is the editor-in-chief of Flow Control magazine. He can be reached at Matt@GrandViewMedia.com.