Vibration transmitters in 4-20 mA 2-wire technology

Vibration Transmitters in 4–20 mA 2-Wire Technology – Simple and Reliable Vibration Monitoring

Vibration transmitters with 4–20 mA 2-wire technology are compact sensor solutions for continuous monitoring of vibrations in machines and systems. They combine a vibration sensor and signal conditioning in a single device and provide a standardized 4–20 mA output signal that can be directly integrated into control and monitoring systems.

Thanks to 2-wire technology, both power supply and signal transmission are carried over the same cable, making installation particularly simple and cost-efficient. These sensors are ideal for industrial applications where a robust and low-maintenance solution for condition monitoring is required.

Vibration transmitters are widely used in condition monitoring systems and help detect wear or malfunctions at an early stage, preventing unplanned downtime.

Key Features and Technical Advantages

• Direct 4–20 mA signal:
  Enables easy integration into PLC, DCS, or SCADA systems without additional signal conditioning.
• 2-wire technology:
  Power supply and signal transmission via a single cable – reduces wiring effort and installation costs.
• Robust design:
  Developed for harsh industrial environments: vibration-resistant, shockproof, and with high protection ratings (IP67 or higher).
• Linearity and accuracy:
  Precise measurement of vibration velocity (mm/s) or acceleration (g) within defined frequency ranges according to ISO 10816.
• Optional temperature compensation:
  Ensures accurate measurements even under significant temperature fluctuations.

How Vibration Transmitters with 4–20 mA 2-Wire Technology Work

Vibration transmitters detect mechanical vibrations using integrated sensing elements—commonly based on piezoelectric or MEMS technology. The measured vibrations are processed directly within the sensor and converted into an analog current signal (4–20 mA).

Signal transmission takes place via a 2-wire connection, where:

• The device is powered through the current loop
• The measurement signal is transmitted simultaneously

The output current is proportional to the measured vibration parameter (e.g., vibration velocity or acceleration). This allows the data to be easily integrated into PLC, DCS, or other industrial control systems.

This simple and standardized signal transmission makes vibration transmitters highly reliable and resistant to interference—even over long distances.

Typical Applications

Vibration transmitters with 4–20 mA 2-wire technology are used in a wide range of industrial applications:

• Condition monitoring of pumps, motors, and compressors
  Early detection of bearing damage or imbalance.
• Predictive maintenance in the process industry
  Seamless integration into existing monitoring systems for continuous plant availability.
• Power plants and energy facilities
  Protection against unplanned downtime through reliable vibration diagnostics.
• Chemical industry and refineries
  Available with ATEX options for hazardous areas.
• Machinery and equipment monitoring
• Integration into PLC and process control systems
• Fan and HVAC systems
• Production plants and manufacturing lines

Advantages of Vibration Transmitters with 4–20 mA 2-Wire Technology

• Easy integration into existing systems
  Standardized 4–20 mA signal for direct connection to PLCs and control systems.
• Low installation effort
  Only two wires required for power supply and signal transmission.
• High interference immunity
  Resistant to electromagnetic interference and signal loss.
• Compact all-in-one solution
  Sensor and signal processing integrated into a single device.
• Reliable condition monitoring
  Continuous monitoring of critical machine parameters.
• Cost-efficient solution for industrial applications
  Ideal for standard monitoring without complex analysis systems.

How to Choose the Right Vibration Transmitter

Selecting a suitable vibration transmitter depends on the requirements of the specific application as well as the existing system environment.

• Measured variable (e.g., acceleration or velocity)
  Depending on the application, it must be decided whether acceleration or vibration velocity is the relevant parameter. For many industrial applications, vibration velocity is commonly used.
• Measurement range and scaling of the 4–20 mA signal
  The measurement range should be selected to optimally cover typical operating conditions without losing resolution.
• Frequency range
  The sensor must be capable of capturing the relevant frequencies of the application to provide meaningful measurement data.
• Output signal and integration
  The 4–20 mA signal must be compatible with the existing control or monitoring system. Signal scaling within the system should also be considered.
• Mounting and design
  The mounting method (e.g., thread, screw) affects measurement quality and should be adapted to the application.
• Environmental conditions
  Temperature, humidity, dust, or chemical influences can affect sensor performance and must be taken into account.
• Approvals and standards
  In certain industries, additional requirements such as ATEX or other certifications may be relevant.

Our experts are happy to support you in selecting the right vibration transmitter for your application. Contact us!