Application Scenarios
In a hydroelectric power station, turbine bearing pedestals experience continuous low-frequency vibration that can indicate imbalance, misalignment, or structural resonance. Operators need reliable vibration data to schedule maintenance before bearing degradation escalates into forced outages. However, the plant’s existing solid-state sensors are overly sensitive to transient impacts from water hammer events, producing nuisance alarms that erode operator confidence in the monitoring system.
The Bently Nevada 9200-06-02-10-00 addresses this challenge directly. Mounted vertically on the bearing housing with its M10 stud base, the 9200-06-02-10-00 captures absolute vibration relative to free space. Its moving-coil design inherently filters out high-frequency impact excitation that would trigger false readings on integrating accelerometers. The sensor’s 10 Hz minimum operating frequency ensures reliable capture of the low-frequency vibration signatures characteristic of hydro turbine instability. When vibration velocity exceeds the alarm threshold, the 9200-06-02-10-00 delivers a clean voltage signal to the plant’s 3500 monitoring system, enabling operators to distinguish genuine mechanical degradation from transient process disturbances.
In another scenario, a petrochemical facility uses the 9200-06-02-10-00 on reciprocating compressor frames, where impact-rich vibration from piston strokes would overwhelm conventional accelerometer-based sensors.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 9200-06-02-10-00 |
| Manufacturer | Bently Nevada |
| Product Category | Two-Wire Velocity Transducer (Seismoprobe) |
| Sensitivity | 20 mV/mm/s (500 mV/in/s) ±5% at 100 Hz |
| Frequency Response | 10 Hz to 1,000 Hz (600 to 60,000 cpm) |
| Velocity Range | Up to 25 mm/s (1 in/s) peak at 100 Hz |
| Coil Resistance | 1.25 kΩ ±5% |
| Operating Temperature | –29°C to +121°C (–20°F to +250°F) |
| Mounting Angle/Min Frequency | Option 06: 0° ±100°, 10 Hz (600 cpm) |
| Connector Option | Option 02: Side mount |
| Mounting Base Option | Option 10: Circular, M10×1 stud |
| Agency Approval | Option 00: No approvals required |
| Case Material | Anodized aluminum A204 |
| Dimensions | 102 mm height × 41 mm diameter (typical) |
| Weight | 300 g (10.5 oz) typical |
Technical Principles and Innovative Values
Self-Generating Moving-Coil Design: The 9200-06-02-10-00 operates on the electromagnetic induction principle. A permanent magnet suspended on springs moves through a wire coil as the machine vibrates, inducing a voltage directly proportional to vibration velocity. This self-generating characteristic eliminates the need for external power, simplifying wiring and enabling portable measurement applications.
Impact Insensitivity Compared to Accelerometers: Unlike solid-state sensors that rely on accelerometers with integrating electronics, the moving-coil architecture of the 9200-06-02-10-00 naturally attenuates high-frequency impact excitation. This makes the 9200-06-02-10-00 superior for applications where impulsive forces—such as those in reciprocating compressors or gear mesh—would otherwise produce misleading vibration data.
Absolute Vibration Measurement: The 9200-06-02-10-00 measures vibration relative to free space (absolute vibration), providing a direct indication of how the machine casing or bearing housing moves in inertial space. This contrasts with proximity probes that measure relative displacement between shaft and bearing, making the 9200-06-02-10-00 particularly valuable for structural vibration assessment.
Rugged Industrial Construction: The anodized aluminum housing and hermetically sealed design of the 9200-06-02-10-00 withstand wet, corrosive, and dusty industrial environments without additional protection. The sensor’s broad operating temperature range of –29°C to +121°C accommodates installations from Arctic compressor stations to tropical power plants.
