IEPE (piezo electric) accelerometers

IEPE Accelerometers – Precise Vibration and Shock Measurement for Industrial Applications

IEPE accelerometers are specialized sensors designed to measure dynamic acceleration, vibration, and shock. They are widely used in industrial measurement technology, machine condition monitoring, and testing systems.

An IEPE accelerometer (Integrated Electronics Piezo-Electric) is a piezoelectric sensor with built-in electronics. Signal conditioning is performed directly within the sensor, resulting in a stable and easy-to-process output signal. This concept enables simple installation and ensures high signal quality.

IEPE sensors are among the most commonly used accelerometers for vibration analysis, vibration measurement, and machine monitoring. They are typically applied in test benches, production systems, and the condition monitoring of critical machinery.

What is an IEPE Accelerometer?

An IEPE accelerometer is based on the piezoelectric effect, where mechanical force generates an electrical charge. The term IEPE stands for:

• Integrated Electronics
  Signal conditioning—especially a charge amplifier—is integrated directly into the sensor housing.
• Piezo-Electric
  The sensing element uses the piezoelectric effect, where mechanical stress generates an electrical charge.

This combination results in a compact and high-performance accelerometer, particularly suitable for dynamic measurements at high frequencies.

How an IEPE Accelerometer Works

The operation of an IEPE accelerometer is based on several coordinated components:

• Piezo element generates electrical charge
  When the sensor is subjected to acceleration—such as from vibrations or shocks—the inertial force acts on the piezoelectric element. This generates an electrical charge proportional to the acceleration.
• Integrated charge amplifier
  The generated charge is immediately converted into a voltage signal by integrated electronics within the sensor. Typical output signals are in the range of 2 to 10 V/g.
• Power supply and signal transmission via a single cable
  IEPE sensors require a constant current supply (typically 2–20 mA), usually provided by a measurement device or data acquisition system.

The key advantage: both power supply and measurement signal are transmitted through the same coaxial cable, significantly simplifying installation.

Advantages of IEPE Accelerometers

• Easy installation
  Only a single coaxial cable is required for both power supply and signal transmission.
• High signal-to-noise ratio
  Integrated electronics ensure stable and precise measurement signals.
• Wide frequency range
  Ideal for highly dynamic measurements of vibration and shock.
• Robust design
  IEPE accelerometers are compact, durable, and low-maintenance.
• Ideal for industrial measurement systems
  Easily integrated into data acquisition systems, test benches, and condition monitoring solutions.

Typical Applications

IEPE accelerometers are used in a wide range of industrial and scientific applications, particularly for dynamic measurement tasks:

• Vibration monitoring of machinery
• Condition monitoring
• Vibration analysis in production systems
• End-of-line test benches in the automotive industry
• Structural testing and modal analysis
• Shock and drop testing
• Crash testing and load analysis
• Research and development in vibration analysis

How to Choose the Right IEPE Accelerometer

When selecting a suitable IEPE accelerometer, several technical criteria should be considered to ensure reliable and accurate measurements.

• Sensitivity
  Typical sensitivities range from 10 mV/g to 1000 mV/g, depending on the application and required resolution.
• Frequency range
  IEPE sensors often cover frequency ranges from around 1 Hz up to over 10 kHz, making them ideal for dynamic vibration and shock measurements.
• Measurement axes
  Depending on the application, single-axis or triaxial accelerometers are available for capturing motion in one or multiple directions.
• Housing material
  Sensors can be made from stainless steel, titanium, or other specialized materials to withstand different environmental conditions.
• Mounting method
  Installation options include stud mounting, adhesive bonding, or magnetic mounting, all of which influence measurement quality and ease of use.

The experts at Althen Sensors & Controls will be happy to support you in selecting the right IEPE accelerometer for your application. Contact us!