Stable vacuum conditions are essential for reproducible processes in industry and research. Even smallest leaks or material-related outgassing can cause process instability, quality losses, or increased energy consumption.
Precise leak-rate calculation and continuous pressure monitoring are therefore crucial for safe, stable, and cost-efficient vacuum processes.
Rate of Rise Measurement for Vacuum System Leak Testing
Leaks cause uncontrolled pressure changes that can negatively affect stable and reproducible process conditions. Especially in the rough and fine vacuum range, rate of rise measurement enables a simple and reliable detection of even the smallest pressure changes, allowing leaks to be identified with high confidence.
Important factors in addition to measurement accuracy:
- High long-term stability
- Easy data evaluation
- Flexible application options
- Reliable use in service, maintenance, and research
Compact Measurement Technology for Versatile Applications
The VD850 is a compact vacuum meter measuring absolute and relative pressure across a wide measurement range, using a combined Piezo/Pirani sensor. It delivers precise measurement results in both rough and fine vacuum ranges.
Typical applications include:
- Initial testing and regular inspection of vacuum chambers, evacuation processes, and production systems
- Long-term recording of measurement data via integrated data logger with export function
- Leak-rate calculation directly at the device via rate of rise measurement
How Does Leak-Rate Calculation via Rate of Rise Measurement Work?
Pressure rise measurement is an established method for determining the integral leak rate:
- Evacuation of the vacuum chamber to the target end pressure
- Isolation from the pumping system
- Measurement of pressure increase within the sealed volume
The slope of the pressure curve is used to determine the integral leak-rate. For accurate results, the chamber or system volume must be known as precisely as possible.
Where Is Leak-Rate Calculation Used in Practice?
Typical application areas include vacuum vessels and systems used in:
- Thin film technology
- Chemical process engineering
- Research and development
- Production and quality assurance
- Service and maintenance
Practical example
A manufacturer of thin film and distillation systems performs pressure rise measurements using the VD850 on laboratory and pilot systems with volumes from 50 liters up to 50 m³, verifying defined leak rate and end pressure requirements.
Conclusion: Increased Process Reliability Through Precise Vacuum Measurement Technology
Reliable leak-rate calculation stabilizes processes, reduces energy consumption, and increases system availability. Compact measurement solutions with integrated data evaluation provide a cost-effective and practical way to monitor modern vacuum systems.
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