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Load Cells Versus Piezoelectric Sensors

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Load cells and piezoelectric sensors are used in all types of measurement applications. While both types of sensors are used to measure similar physical quantities, they work on different principles and have distinctive characteristics.

By simple definition, load cells measure the amount of force or weight being applied to them. The amount of force a load cell is engineered to measure is numerated by the capacity of the model specification and design, such as 50lbf (pounds-force) or 5kN (kilonewton). When a force is applied to the load cell, the metal body deforms slightly, which changes the resistance of the strain gages. This change in resistance is then measured and used to calculate the amount of force being applied to the load cell.

Piezoelectric sensors work on the principle of piezoelectricity. They are made of materials that generate an electric charge in response to mechanical stress, such as pressure or vibration. Piezoelectricity is a property of certain materials that allows them to generate an electric charge in response to applied mechanical stress, such as pressure or vibration. The word “piezo” comes from the Greek word for “squeeze” or “press,” which refers to the fact that these materials generate an electric charge when they are squeezed or pressed. When a force is applied to a piezoelectric sensor, it generates a voltage proportional to the amount of force being applied. This voltage can then be measured and used to calculate the force or weight being measured. Piezoelectric sensors are most often used in vibration and pressure tests.

Load cells are more suitable for applications where high accuracy is required, as they are more sensitive than piezoelectric sensors in detecting smaller changes in force. Load cells are characteristically more robust and can withstand higher loads without being damaged. Piezoelectric sensors, on the other hand, can be more fragile and may require more careful handling to avoid damage.

Load Cell Advantages

  • Higher accuracy: Load cells are more accurate than piezoelectric sensors, especially when measuring low loads. Load cells can provide precise and reliable measurements with minimal error, making them ideal for applications that require high accuracy. Read: Specifying Accuracy Requirements When Selecting Load Cells
  • Lower sensitivity to temperature changes: Load cells are less sensitive to temperature changes than piezoelectric sensors. This means that load cells can maintain their accuracy even when the temperature changes, while piezoelectric sensors may need to be calibrated frequently to maintain accuracy. Read: Understanding Load Cell Temperature Compensation
  • Better linearity: Load cells have a more linear response than piezoelectric sensors, which means that their output is more predictable and easier to calibrate. This is particularly important in applications where accurate and repeatable measurements are critical.
  • Higher durability: Load cells are more robust and can withstand higher loads without being damaged. This makes them suitable for applications where high loads are present, such as in heavy machinery or construction.
  • Lower cost: Load cells are often less expensive than piezoelectric sensors, making them a more cost-effective choice, especially for OEM use cases.

Piezoelectric sensors are used in a wide range of applications that require the measurement of vibration or acceleration. For example, piezoelectric sensors can be used in machinery and equipment to monitor vibrations and detect potential problems, such as imbalances or misalignments. They are the sensors used in cars to measure pressure, such as in tire pressure monitoring systems or fuel injection systems. Piezoelectric sensors are found in ultrasound imaging to generate and detect sound waves and in musical instruments, such as electric guitars or electronic drum kits, to convert vibrations into electrical signals for amplification.

In selecting the right load cell for any project, check out our new Load Cell Selection Guide. It is a useful resource to determine the capacity, capability and design features that are best suited for your applications. You can also check out How to Choose the Right Load Cell.

Load cells and piezoelectric sensors have distinctive characteristics and advantages, thus specific application requirements will determine the choice of sensor. For questions about selecting the right sensor for your application, contact our solutions engineers.

Additional Resources

How Do Load Cells Work?

LowProfile Load Cells 101

Get an Inside Look at Interface’s Famously Blue Load Cells

Load Cell Basics Sensor Specifications

Interface Load Cell Field Guide

 

 

Faces of Interface Featuring Mark Bliss

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For our newest edition of Faces of Interface, we had the opportunity to talk with Mark Bliss, senior application engineer, with our manufacturer’s representative, Minnesota Measurement Engineering.

Minnesota Measurement Engineering (MNME) works across a wide variety of industries throughout Minnesota, North Dakota, South Dakota, Western Wisconsin, and Iowa. They help engineers specify sensing, testing, and measuring products that best fit their needs and the needs of their application. In addition, MNME builds and integrates custom test and measurement systems for customers. We are thrilled to have them as a partner and are proud to feature Mark Bliss and the team at MNME.

Mark is proud to be a career learner, especially as it pertains to science and engineering. Mark’s mother was a librarian, and his father was involved in science. His upbringing led both himself and his brother to pursue a career in engineering.

Mark attended the University of Minnesota, where he received a Bachelor of Science in Mechanical Engineering. During his time in school, he also engaged in several high-profile internships with Thermo King Corporation, Ecolab, Inc., and Honeywell. This experience helped him get hired at Boeing shortly after college.

Mark spent a year and two months with Boeing as a mechanical design engineer before he and his wife decided they wanted to return to Minnesota. With the move, Mark joined MTS Systems Corporation where he served as a mechanical engineer and program leader within the Systems Product Development R&D Group.

Mark also started his own engineering consulting services company 2RM, LLC. Mark’s passion for engineering pushed him to moonlight as a consultant for everything from OEMs to startups. Some of the work he conducted included custom machine design, structural finite element analysis and optimization, reverse engineering, prototyping, component and material sourcing, in addition to boosting his skill set in sales, accounting, marketing and customer service.

In 2015, Mark was looking for a new challenge and saw an opportunity to take on a sales role at MNME while still applying his passion for engineering through the custom systems side of the business.

As a Senior Application Engineer at MNME, Mark is responsible for assisting customers with force, torque, pressure, acceleration, position, flow, vibration, data acquisition, and custom solutions for R&D, industrial, and OEM applications. His role includes supporting customer product information and quoting requests, visiting customers to understand and identify needs, following up on leads and principal contact reports, identifying sales opportunities and maintaining relationships with customers of all sizes.

Mark mentions that the best part about his position with MNME is the fact that he gets to see and work with new technology every day. Some days he might be working with a medical device manufacturer and the next day he is selling solutions for an autonomous vehicle. The diversity of his customers keeps him on his toes and ensures he’s always learning something new.

He also loves the fact that he gets to continue getting hands on with technology. One of the unique capabilities of MNME is the fact that they act as both a manufacturer’s rep, as well as a solutions provider. Many of Mark’s customers leverage him to develop custom systems or help integrate systems in their test and measurement process.

So where does Interface fit into all this? Going back again to MTS Systems, Mark would often interact with Interface. He developed a fondness for our force measurement products and systems because of their accuracy, durability and reliability. When he moved to MNME, he continued that relationship on the sales side and now acts as one of our top reps!

He, his wife and their two girls are also highly active. The family enjoys downhill skiing, boating, fishing and camping, as well as traveling the world. When we spoke to Mark, he discussed a many skiing trips he had taken in Austria, Germany, and Canada. Finally, if he wasn’t already involved in enough, he also enjoys investing in stocks and bonds. The man certainly keeps himself busy!

We are proud to have Mark at MNME representing Interface products and services. Working alongside Josh Sebasky, both provide Interface customer’s a great depth of experience and knowledge whether it is finding the right load cells or torque transducers for a test project or customizing a verification load frame solution for test and measurement programs.

To locate a representative or distributor in your area, please visit here.

The Future of Force Measurement

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In this post, Joel Strom, CEO at Interface, shared his vision for the company and force measurement predictions for 2020 and beyond. 

Engineering and manufacturing are continuously changing to keep up with the pace of fast-evolving technology. It feels like every time one of our customers releases a game-changing new product; they immediately go back to the drawing board to work on its next evolution. To enable our customers to meet the speed of innovation and compete in the expanding sensor marketplace, Interface must follow suit. That also means we are constantly looking at ways to improve the ingenuity and capability of our vast array of products and solutions.

Looking ahead to 2020 and the next five years, here are our predictions for the future of force measurement and how Interface is positioning ourselves as leaders in our industry.

Innovating for the Digital Age

For much of Interface’s 50-year history, we have developed analog load cells. This was always the way a load cell worked. In recent years, we have put a heavy focus on innovation and transforming our company for the digital age. The sensors we are building now allow our customers to transmit data wirelessly through WIFI and Bluetooth® technology. These products help to connect everything through the internet of things (IoT), giving our customers more accessibility in the way they collect and measure force data.

We are deliberately focusing on ways to provide our customers with more value from our entire suite of force measurement products, custom solutions, and services. Our goal is to connect everything we design, build and create ensuring the data our products gather can help make better decisions and automate processes greater efficiency and usability for our valued customers. Through the age of digital transformation, Interface is a partner to our customers in helping them do big things in the world.

Pushing the Limits in Force Measurement Technology

One of the biggest trends in force measurement is the demand for all-in-one tools and systems that provide more data points from a single product. Customers want their load cell and sensor technology to measure a combination of force, torque, vibration, position, speed and more.

We are addressing these requirements by investing in the next generation of our core products to improve the value to customers. As the most accurate and reliable load cell manufacturer, we want to push the limits on the accuracy, improve the temperature ranges of our products, and expand application uses and grow capacities. Using our ingenuity and industry experience, we also want to add more capability to our core products. Digitizing existing product lines is one way we are doing, as well as adding more sensors that can collect a wider range of data.

Exploring New Industries and Advanced Technology

One of the most exciting things about working in the force measurement industry is the fact that we are on the ground floor in developing new and innovative hardware. As we enter a new decade, we see expanding developments in space, robotics, and electric and autonomous vehicles. These are all products and inventions that require extremely accurate force measurement tools to create and test their innovations.

In order to stay on top of new technology, we are investing more in research and development than ever before. Imagining the possibilities, we are working closely with our customers, and in many cases partnering with them, to understand their evolving needs. Many of the products we have released in the last two years have been a direct response to customer requests and the application of imaginative thinking from our skilled leadership and engineering teams.

As we continue our journey in the 2nd 50 years of Interface, we are excited about the possibilities of force measurement and the new ways we can help our customers. We can’t wait to show you what we have on the horizon.

To stay up-to-date on new product announcements and to learn more about Interface and its commitment to accuracy, reliability, and innovation, please stay connected by subscribing to our blog and follow us on our social media channels: LinkedIn, Twitter, YouTube, and Facebook.  You can also watch a recent company video highlighting why Interface was chosen as Arizona’s 2019 Manufacturer of the Year.

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