The 330878-50-00 solves key challenges in large rotating equipment condition monitoring.
It provides accurate, non-contact measurements for vibration, thrust, and rotor expansion in turbines.
In power generation, oil, gas, and petrochemical plants, it prevents catastrophic machine failures.
This sensor delivers reliable data to support predictive maintenance and reduce unplanned downtime.
Its 50mm range fits large-scale turbomachinery where smaller sensors cannot reach critical areas.
Technical Insights
50mm Extended Linear Sensing Range
This model offers a 50mm linear measurement range for large rotor displacement detection.
It captures full movement in large steam turbines and generators with high precision.
Longer range eliminates measurement blind spots and ensures complete rotor health visibility.
This capability supports accurate differential expansion monitoring in heavy industrial turbomachinery.
It reduces the need for multiple sensors and simplifies overall monitoring system architecture.
Wide Frequency Response (0–20kHz)
The 0–20kHz frequency range detects both low-speed position and high-frequency vibration events.
It captures early warning signs of bearing faults, imbalance, and misalignment in rotating shafts.
Broad response ensures no critical mechanical fault signals are missed during operation.
This performance supports precise analysis for predictive maintenance across all operating speeds.
It improves diagnostic accuracy and helps teams address issues before they cause failures.
Extreme Environmental Durability
The unit operates reliably from -51°C to +100°C and withstands harsh industrial conditions.
Its IP67-rated enclosure resists dust, moisture, and chemical exposure in plant environments.
Hermetic construction protects internal components from vibration and physical shock.
Stable performance in extreme conditions reduces sensor failures and extends service intervals.
This durability lowers maintenance costs and ensures continuous monitoring in critical applications.
Installation & Maintenance
Correct Mounting and Orientation
Install the 330878-50-00 only in designated panel or DIN rail locations.
Align probe and sensor precisely to maintain calibrated air gap and measurement accuracy.
Use only Bently-approved mounting brackets to avoid signal distortion and mechanical stress.
Ensure proper clearance to prevent interference with rotating components during operation.
Secure all connections tightly to avoid intermittent signal issues in high-vibration areas.
Cable Management Guidelines
Maintain a minimum 63.5mm bend radius for extension cables to prevent signal loss.
Separate sensor cables from high-voltage power lines to reduce electrical interference.
Use shielded cables and proper grounding practices to minimize electromagnetic noise.
Avoid sharp pulls or kinks that damage internal wiring and degrade measurement performance.
Secure cables away from moving parts to prevent abrasion and unexpected failures.
Routine Calibration Checks
Verify output signal linearity quarterly using certified calibration equipment.
Inspect probe tip condition for damage or contamination that affects measurement accuracy.
Check all electrical connections for corrosion or looseness during routine inspections.
Document calibration results to track performance trends and plan preventive maintenance.
Replace components showing drift beyond factory specifications to maintain monitoring integrity.
Buyer’s Guide FAQ
Is 330878-50-00 compatible with older Bently 7200 series systems?
Yes, the 330878-50-00 directly replaces legacy 7200 series 50mm sensors.
It uses identical mounting dimensions and electrical interfaces for straightforward upgrades.
Existing brackets, cables, and monitoring systems work without modification.
This compatibility reduces upgrade costs and eliminates system redesign requirements.
Teams can modernize monitoring while preserving existing infrastructure investments.
What applications benefit most from this 50mm proximitor sensor?
This model excels at measuring differential expansion in large steam turbine generators.
It monitors thrust position, shaft vibration, and runout in heavy rotating machinery.
Ideal for power plants, refineries, and large compressor stations with critical turbomachinery.
Suitable for equipment where long rotor travel requires extended measurement range.
It delivers reliable data for predictive maintenance programs in heavy industrial environments.
How does this sensor differ from standard 25mm proximity transducer systems?
The 330878-50-00 offers double the measurement range of standard 25mm models.
It supports larger rotor movements in heavy-duty industrial turbomachinery.
Extended range enables complete coverage in applications where 25mm sensors are insufficient.
It maintains similar accuracy and response time while covering greater displacement.
This makes it the preferred choice for large turbines and generators with significant shaft travel.
