A Trend In measurement and automation technology, this refers to the graphical representation of measured values over time. In this process, analog and digital signals are displayed in a Time-Domain Plot (y-t Plot) plotted. Time is plotted on the horizontal axis (x-axis) and the measured value on the vertical axis (y-axis).
Trend analysis is one of the most important tools in measurement data analysis, as it quickly and clearly illustrates changes, trends, and relationships among measured variables.
How does a trend chart work?
In a trend, continuously recorded measurements are plotted over time. This allows you to observe and analyze measurement trends.
Examples of measurable quantities include:
- Temperature
- Flow rate
- Current
- Voltage
- Performance
- Vibrations
- Levels
- Digital Switching States
Continuous recording makes it possible to track both current conditions and historical trends.
Online Trends and Offline Trends
Online Trend
An online trend visualizes measurement values directly in real time as data is being collected.
Advantages:
- Real-time process monitoring
- Rapid Error Detection
- Live Display of Measurement Values
- Immediate Response to Deviations
Online trends are frequently used in control rooms, test benches, and production facilities.
Offline or Analysis Trend
An analysis trend displays previously recorded measurement data and enables a detailed retrospective evaluation.
Advantages:
- Historical Analyses
- Investigating the Causes of Disorders
- Long-term analyses
- Comparison of Different Measurement Periods
- Documentation and Reporting
Offline analysis plays a key role, particularly in process optimization and error analysis.
Benefits of Trend Charts
The graphical representation of measurement data offers numerous advantages:
- Quick Detection of Changes
- Simple Interpretation of Complex Measurement Data
- Early Detection of Disorders
- Support for Troubleshooting
- Optimization of processes
- Verification and Documentation of Process Flow
- Comparison of Various Metrics
Especially when dealing with large amounts of data, trend charts are much more informative than raw numerical values.
Trend Analysis in Delphin Systems
The solutions from Delphin Technology enable the acquisition, storage, and visualization of measurement data in real time, as well as the subsequent analysis of historical data. With the measurement technology software ProfiSignal 20 Powerful trend analysis functions are available for this purpose. Measurement values from a wide variety of sensors can be visualized, analyzed, and compared with one another in trend graphs. In addition, the software supports both online analysis during ongoing measurements and detailed analysis of stored measurement data.
Users can:
- Display Multiple Measurement Channels Simultaneously
- Zoom freely in time ranges
- Compare Measurements
- Monitor Threshold Values
- Analyze Events
- Analyze Long-Term Trends
This enables a thorough analysis of processes, systems, and measurement tasks.
Typical areas of application
Trend charts are used in:
- Process monitoring
- Energy Monitoring
- Test Bench Technology
- Laboratory Applications
- Machine monitoring
- Environmental measurement technology
- Building Automation
- Research and development
- Quality Management
- Condition Monitoring
Especially for ongoing processes, trends enable a quick assessment of the plant's condition and support data-driven decisions.
Implications for Data Analysis
A trend turns individual data points into a clear pattern. This allows users to:
- Recognizing Trends
- Identify Patterns
- Locating Faults
- Analyzing Relationships Between Metrics
- Derive predictions about system behavior
Trend analysis is therefore a key tool for modern measurement data acquisition, process monitoring, and Industry 4.0 applications.