Published on July 3, 2026 at 21:35
Predictive maintenance is one of the most economically sensible approaches in industry, and vibration measurement is its most important diagnostic method for rotating machinery. Rolling bearings, motors, pumps, gearboxes, fans: all of them reveal their condition through measurable vibrations long before a visible problem appears. A developing bearing failure typically announces itself 4-8 weeks before breakdown through a specific vibration signature. The trick is to capture that signal in time, and that takes an instrument that goes where the machine is. The VB400 pen vibration meter is built for exactly this purpose.
What a Vibration Meter Does in Practice
Vibrations on a machine are recorded in two quantities: acceleration (m/s² or g) and velocity (mm/s). The two are related, since velocity is the time integral of acceleration, but they provide different diagnostic information.
Acceleration is particularly sensitive to high-frequency vibrations (100-1000 Hz and above). These are typical of bearing damage: spalling of the rolling elements or cracking in the raceway material produces short, high-frequency impacts with high acceleration. A standard parameter for bearing diagnostics is the acceleration amplitude in specific frequency bands.
Velocity is particularly sensitive to mid-frequency vibrations (10-1000 Hz). These are typical of rotational problems: rotor imbalance, misalignment between the motor and the driven machine, loose foundation bolts. Velocity is also the standard measure in many standards, such as ISO 10816, which defines limit values for different machine classes.
The VB400 in Detail
The VB400 vibration meter comes in a pen format: compact, rugged and optimized for one-handed operation in day-to-day maintenance. It measures RMS values (Root Mean Square, effective values) for both quantities:
- Acceleration: 0 to 200 m/s² with 0.1 m/s² resolution
- Velocity: 0 to 200 mm/s with 0.1 mm/s resolution
- Frequency range: 10 Hz to 1 kHz
- Basic accuracy: ±(5 % + 2 digits)
- Water resistance: IP65 (dust-tight and protected against water jets)
The 10 Hz – 1 kHz frequency range was chosen deliberately: it covers the typical vibration signatures relevant to bearing diagnostics and rotational problems. High-frequency analyses (gear teeth at very high speeds) would require specialized instruments with an extended frequency range, but for 90% of applications this range is sufficient.
How a Measurement on the Machine Works
- The pen’s measuring tip is placed on a solid structure of the machine, typically on the bearing housing or the motor foot.
- The tip is pressed on with even pressure; a magnetic base (included) also allows hands-free positioning on ferromagnetic surfaces.
- After a few seconds, the display shows the RMS value of the vibration.
- The value is noted down or compared with previous measurements at the same position.
Trend measurement, meaning regular repetition at the same measuring point, is the key to early diagnosis. An absolute value on its own says little; a rise over time is the diagnostically relevant information.
Where the VB400 Can Be Used in Daily Practice
Maintenance of production plants: Fans, pumps, conveyor systems, compressors. Weekly or monthly measurement rounds with the VB400 allow condition monitoring without investing in permanently installed sensors.
HVAC maintenance: Air conditioning systems with large fan motors, cooling tower pumps, condenser fans. Vibration anomalies point to incipient bearing problems, which can be resolved by relubrication or bearing replacement before a summer breakdown turns into a crisis.
Water and wastewater management: Pumps in waterworks and sewage treatment plants run 24/7. Failures are problematic under all circumstances. Predictive maintenance with vibration measurement is more cost-effective than reactive repairs.
Wind turbines: Gearbox input and output, generator bearings. Weekly measurements in the nacelle, where access is limited, so a compact pen format is practical.
Shipyards and boatyards: Propulsion systems, cooling water pumps, generators. Regular condition checks reduce service effort while underway.
Plastics processing and the plastics industry: Extrusion lines, injection molding machines. Gearbox damage leads to product quality problems, and early diagnosis saves scrap.
Construction machinery maintenance: Excavators, wheel loaders, compressors on construction sites. Vibration measurement as part of the maintenance routine detects incipient problems that would otherwise lead to unexpected breakdowns.
Machine tool maintenance: Spindle bearings, feed motors, ball screws. Precision machines with preventive vibration monitoring deliver consistent machining quality for longer.
Training: The VB400 is an excellent teaching tool for aspiring maintenance technicians. The relationship between machine condition and vibration signature becomes directly tangible.
Cost-Effectiveness
A single unplanned failure of a critical system typically costs 10 to 100 times the price of the instrument, including lost production, emergency call-outs and possibly consequential damage to the unit. Even if the VB400 prevents only a single failure per year, the ROI is dramatic.
In addition, predictive maintenance reduces spare parts inventory. You know in advance which bearings or motors need to be replaced and can order them on schedule instead of making emergency purchases.
What’s Included
VB400 vibration meter with fixed pen tip for direct contact, magnetic base for hands-free positioning on ferromagnetic surfaces, 4 x AAA batteries, carrying case for the toolbox.
€742 is an investment that, for most maintenance departments, pays for itself with a single bearing failure caught early. For smaller workshops and sole proprietors without a dedicated maintenance department, it is a tool that opens up access to professional condition monitoring.
Learn more: View the VB400 Pen Vibration Meter in the shop →
