- July 2, 2025
What Is a Strain Gauge Signal Conditioner and Why Is It Important?
Strain gauges are widely used in load cells and torque transducers to measure mechanical deformation. However, the raw output from a strain gauge is typically a very small voltage signal, often in the millivolt range, which is too weak and noisy for direct processing by most data acquisition systems or PLCs.
What Is a Strain Gauge Signal Conditioner?
A strain gauge signal conditioner is an electronic device that amplifies, filters, and converts the low-level electrical signals generated by strain gauges into a usable output format such as voltage, current (e.g., 4–20mA), or digital signals (RS485, Modbus, etc.).
It acts as the intermediary between the sensor and the control system, ensuring that the signal is strong, stable, and readable for further analysis or automation.
Why Is Signal Conditioning Important?
Signal conditioning plays a crucial role in ensuring accurate, reliable, and usable data from sensors like strain gauges in industrial and scientific applications. Without proper conditioning, raw signals can be too weak, noisy, or incompatible with control systems, leading to errors and inefficiencies.
Here are the key reasons why signal conditioning is important:
- Signal Amplification
Strain gauges typically produce signals in the range of ±1–5 mV/V, which is too small for most systems to read accurately. Signal conditioners amplify this signal to a higher voltage level (e.g., ±10V or 4–20mA) to ensure better resolution and accuracy.
- Noise Reduction
Industrial environments can introduce electrical noise and interference. Signal conditioners often include low-pass filters and shielding features to minimise noise and ensure a clean signal.
- Bridge Excitation Supply
Most strain gauges operate in a Wheatstone bridge configuration and require a stable excitation voltage. Signal conditioners supply this excitation (typically 5V or 10V), ensuring consistent performance.
- Signal Conversion
Modern PLCs, data acquisition systems, and controllers often require standardised inputs. Signal conditioners convert the raw signal into:
- Analog voltage (0–10V, ±5V)
- Current loop (4–20mA)
- Digital output (RS232, RS485, CAN, Modbus)
- Zero and Span Calibration
Many signal conditioners offer manual or software-based calibration to fine-tune the output signal, ensuring that zero-load and full-scale load readings are accurate and repeatable.
Key Features of a Signal Conditioner
Signal conditioners are essential components in industrial and scientific measurement systems, ensuring that sensor signals are accurately and reliably processed before reaching controllers or data acquisition units. Their design incorporates several key features that enhance performance, compatibility, and safety across diverse applications.
| Feature | Benefit | |
| High Accuracy and Resolution | Critical for precise measurement in load testing and weighing | |
| Compact Size | Ideal for integration into tight spaces or embedded systems | |
| DIN-Rail or Panel Mount | Flexible installation options in control cabinets | |
| Multiple Output Options | Compatibility with various industrial systems | |
| Temperature Compensation | Ensures stable performance in varying conditions | |
| Isolated Output | Protects downstream systems from electrical interference |
Where Do You Need Signal Conditioning
Signal conditioning is essential wherever precise, low-level sensor signals—like those from strain gauges—need to be amplified, filtered, or converted for reliable use in control systems. These applications span across industries where accuracy, safety, and performance are critical.
Industrial Automation
- Force and torque monitoring in robotic arms
- Tension control in web handling systems
Structural Health Monitoring
- Bridge and building stress analysis
- Real-time load monitoring in construction sites
Aerospace & Automotive
- Component fatigue testing
- Crash and safety testing systems
Research & Development
- Material testing rigs
- Experimental stress analysis
Medical Devices
- Biomechanical force sensors
- Patient lifting and weighing systems
Learn more about load cells in medical applications.
A signal conditioner is not an optional accessory, it’s a critical component that ensures reliable and accurate measurement in any strain-based sensing application. By amplifying, filtering, and converting signals, it bridges the gap between delicate sensor output and industrial-grade data processing systems.
When selecting a signal conditioner, always consider the output requirements, sensor type, and environmental conditions of your application.
MeasureX offers high-performance signal conditioners tailored for load cells and torque sensors. If you’re looking for a high-performance solution for strain gauge applications, the MAS10 Strain Gauge Signal Conditioner is a reliable choice. Designed for industrial and research environments, the MAS10 offers:
- High-accuracy signal amplification with low noise
- Built-in excitation voltage (5V or 10V)
- Adjustable zero and span settings
- Multiple output options, including analog (0–10V, 4–20 mA) and digital
- Compact and DIN-rail mountable for easy integration
Contact us today to find the best match for your measurement system.
