August 28, 2023
Strain gauge load cells are the industry standard for force measurement in industries that require precision. From big industrial systems to lab applications, they’re the go-to solution. Known for their accuracy, reliability, and cost-effectiveness, they meet the growing demand for durability and precision across many sectors. At Massload Technologies, we’ve been at the forefront of providing high-quality strain gauge load cells to meet these needs.
Our guide will help break down the basics of strain gauge load cells, how they work, the benefits, what to look for when choosing one and how to maintain them for best performance.
What is a Strain Gauge Load Cell?
A strain gauge load cell is a precise instrument to measure force in many applications. It has a metal body that detects changes in force or weight. These are used in industries like manufacturing, research, and transportation, where precision is key.
Strain gauge load cells, known for their versatility, can handle anything from heavy industrial use to delicate scientific applications. They are cost-effective, durable, and reliable, even in harsh environments with extreme temperatures or high humidity. So, they are the go-to choice for applications that require consistent and precise force measurement.
How Strain Gauge Load Cells Work
Strain gauge load cells turn mechanical force into an electrical signal, making it easy to measure weight or force accurately. Here’s how it works:
When you apply force to the load cell, an internal spring element bends or stretches slightly. This movement affects the strain gauges attached to it, changing how electricity flows through them.
These strain gauges are tiny metal wires that detect the movement of the spring. When they stretch or compress, their resistance changes. A special circuit, called a Wheatstone bridge, then turns this change in resistance into a small electrical signal.
That signal directly matches the amount of force applied, giving a precise and reliable measurement. It’s a simple yet incredibly effective system!
Breaking Down The Benefits of Using Strain Gauge Load Cells
Strain gauge load cells have many advantages that make them the go-to choice in industrial and scientific applications:
1. Accuracy
Strain gauge load cells are known for their high accuracy. The detailed measurement of resistance changes and advanced electronics means highly accurate force readings. They’re perfect for scientific applications and industrial systems that require precise measurements.
2. Reliability
They’re built to last. Less wear and tear than mechanical systems and can perform in the harshest of environments. Minimal calibration and maintenance required.
3. Durability
Strain gauge load cells can withstand harsh conditions. Whether it’s extreme temperatures, vibrations, chemicals or moisture, they can perform in demanding industries like manufacturing, food processing and oil and gas.
Comparison with Other Types of Load Cells
While strain gauge load cells are popular, other load cell types like hydraulic and capacitive load cells have their own advantages. Here’s how they compare:
Hydraulic Load Cells
Hydraulic load cells measure force by detecting the pressure of a liquid in a chamber. They’re simple and reliable but bulkier and less accurate than strain gauge load cells. They’re also sensitive to temperature changes which can affect performance.
Advantages of Strain Gauge Load Cells over Hydraulic Load Cells:
- More accurate
- Smaller and more versatile
- Easier to interface with digital systems
Capacitive Load Cells
Capacitive load cells measure the change in capacitance when materials deform under force. While they have some benefits, capacitive load cells are more sensitive to environmental factors like humidity and temperature. They’re not as robust as strain gauge load cells in many industrial applications.
Advantages of Strain Gauge Load Cells over Capacitive Load Cells:
- More robust in industrial environments
- Less environmental sensitive
- More durable and less wear
Types of Strain Gauge Load Cells
Strain gauge load cells come in different types to suit specific requirements. They’re classified into tension and compression types based on the forces they measure.
Tension Strain Gauge Load Cells
These measure pulling forces. When tension is applied, the strain gauge elongates, and the electrical resistance increases.
Common Applications:
- Crane scales
- Hoist weight monitoring
- Rope tension measurement
Compression Strain Gauge Load Cells
Compression load cells measure pushing forces. When force is applied, the strain gauge shortens and gets thicker, and the electrical resistance decreases. These load cells are used in applications where forces are applied downwards, such as tank or vessel weighing.
Common Applications:
- Tank, hopper and vessel scales
- Material testing equipment
- Compression-based testing machines
How to Maintain and Calibrate Strain Gauge Load Cells
At Massload, we offer comprehensive services to help you keep your load cells in top condition. Here’s how you can maintain and calibrate your strain gauge load cells:
Maintenance
- Regular Checks: Check for wear and corrosion. Clean the load cell regularly to prevent dirt or moisture from affecting its performance.
- Environmental Protection: Keep the load cell within its specified temperature and humidity range. Use protective enclosures if necessary.
- Overloading: Never exceed the load cell’s capacity to prevent damage.
- Cable Care: Check cables for wear and stress to prevent electrical failures.
Calibration
- Initial Calibration: Calibrate the load cell after installation or long term storage using certified weights in a controlled environment.
- Periodic Calibration: Recalibrate every 6 to 12 months for continued accuracy.
- Zeroing & Span Adjustments: Zero the load cell and adjust the span for full range readings.
- Testing Against Standards: Compare the load cell’s output to known weights to ensure it’s still accurate.
For your convenience, you can also send your load cells back to Massload for calibration, ensuring your equipment performs optimally over time.
Troubleshooting Common Problems
Even with proper maintenance, issues can occur. Here’s how to troubleshoot:
- Inconsistent Readings: Temperature or electrical noise could be the cause. Recalibrate or check connections.
- No or Low Output Signal: Check power supply and wiring.
- Overload: Check for damage if the load cell has been overloaded and recalibrate or replace as required.
- Mechanical Damage: Cracks or deformation will require load cell replacement.
Why You Can Benefit from Our Expertise
Even with proper care, performance and reliability requires expertise. Massload Technologies has over 40 years experience, we provide custom load cell solutions and full support. We help with everything from initial selection to ongoing maintenance, troubleshooting and calibration. We have a proven track record across many industries, Massload will get your load cells performing and delivering long term value and precision for your business.
Massload Technologies is a Trusted Strain Gauge Load Cell Manufacturer
Need help finding a strain gauge load cell for your application? Contact us for more information on strain gauge load cells, load cell applications, and capabilities or if you need assistance selecting a scale load cell solution.
Can’t find a load cell that addresses your challenges? Request a quote for a custom load cell solution that meets your application requirements.
