Bently Nevada 330876-01-90-00-05 50 mm Differential-Expansion Probe
A 1/2-20 straight-exit probe with high-temperature FluidLoc cable and multiple approvals for long-range turbine measurements.
Product Profile
330876-01-90-00-05 is a straight-exit probe for the 3300 XL 50 mm proximity transducer system. The large sensing coil supports the long linear travel needed for differential expansion and rotor expansion on large turbine generators.
Its suffix specifies a 1/2-20 case, nine-metre length, high-temperature FluidLoc cable without armor and the multiple-approval option.
Technical Data
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Complete Part Number | 330876-01-90-00-05 |
| Product Family | 3300 XL 50 mm |
| Probe Case | Straight exit, 1/2-20 thread |
| Total Probe Length | 9.0 m (29.5 ft) |
| Cable Construction | High-temperature FluidLoc cable |
| Armor Option | Without armor |
| Agency Approval | Multiple approvals |
| System Linear Range | 27.9 mm (1100 mil) |
| Nominal Scale Factor | 394 mV/mm (10 mV/mil) |
| Continuous Probe Temperature | Up to 200°C |
| Intermittent Probe Temperature | Up to 250°C |
System Role
- Measures large axial growth differences between turbine rotor and casing.
- Works with a 3300 XL 50 mm extension cable and 330878 Proximitor Sensor as one calibrated chain.
- Supports single-sided redundant or complementary differential-expansion arrangements.
Compatibility
- Keep the total system length matched across probe, extension cable and 330878 Proximitor Sensor.
- When upgrading an older 7200 50 mm loop, replace every transducer-system component with the 3300 XL 50 mm family.
- Confirm the target collar, bracket, direction of movement and monitor range before commissioning.
Applications
- Steam-turbine differential-expansion measurement.
- Rotor-expansion monitoring on large turbine-generator trains.
- Engineered upgrades from legacy 7200 50 mm systems using compatible mounting arrangements.
FAQ
Is 330876-01-90-00-05 intended for ordinary radial vibration points?
Its principal role is long-range differential or rotor expansion; use a probe family sized for the actual measurement travel and target.
Which Proximitor Sensor belongs with 330876-01-90-00-05?
Use the 330878 50 mm Proximitor Sensor configured for a nine-metre total system and the correct extension cable.
Can only the probe be changed when migrating a 7200 50 mm loop to 330876-01-90-00-05?
No. Replace the probe, extension cable and Proximitor Sensor as a complete 3300 XL 50 mm system.
What mounting information is needed for 330876-01-90-00-05?
Document the 1/2-20 bracket, collar geometry, expected axial travel, straight-exit clearance and verification-slide arrangement.
How should 330876-01-90-00-05 be verified after installation?
Move the probe assembly through a known displacement, confirm scale and direction, then validate monitor range, alarms and redundancy logic.
What should be included in a quotation request for 330876-01-90-00-05?
Provide the exact model, extension cable, Proximitor Sensor, bracket style, target drawing, operating temperatures and area classification.
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