330876-02-50-00-00 (Bently Nevada 3300 XL 50mm Eddy Current Probe)

Model: 330876-02-50-00-00

Brand: Bently Nevada (Baker Hughes)

Series: 3300 XL 50mm Large Gap Eddy Current Sensor System

Type: Probe, Ceramic Sensor Head, M14×1.5 Side-Outlet One

Model Analysis (330876-A-B-C-D)

330876: 3300 XL 50mm Large Gap Probe (Ceramic Head)

02: Probe Housing → M14×1.5 Metric Thread, Side-Outlet

50: System Total Length → 5.0m (Probe Comes with Cable Total Length)

00: Cable Type → High Temperature FluidLoc Non-Covered Cable (-40°C to +120°C)

00: Certification → No Explosion-proof / Third-party Certification (General Environment Use)

II. Core Parameters

1. Electrical and Measurement

Measurement Range: 0～50mm; Linear Zone: 2～45mm (Suitable for 4140 Steel)

Sensitivity: 40mV/mm (±5%)

Frequency Response: 0～5kHz

Output Signal: -24V to 0V DC (Proportional to Gap)

Recommended Working Gap: 10～40mm (Typical Working Point 20mm ≈ -16V)

2. Mechanical and Environment

Sensor Head: Ceramic (Corrosion-resistant, Anti-Hydrogen Embrittlement)

Housing: 316 Stainless Steel, M14×1.5 Thread, Side-Outlet

Cable: FluidLoc High Temperature Non-Covered, 5.0m Total Length

Protection Grade: IP67

Working Temperature: -40°C to +120°C (Cable); -40°C to +85°C (Probe Body)

Weight: ≈1.1kg

III. System Compatibility (Must be a Complete Set)

1. Matching Components

Probe: 330876-02-50-00-00 (50mm, 5m, Non-Covered)

Extension Cable: Not Required (Probe Comes with 5m Cable, Direct Connection to Preamplifier)

Preamplifier: 330878-50-00/05 (5m System, Panel Mounting)

Monitoring Module: 3500/40M (Vibration), 3500/45M (Axial Displacement), 3500/50M (Phase)

2. Applicable Scenarios

✅ Large Diameter (＞200mm), Large Gap (10～40mm)

✅ Hydrogen-cooled Generator, Sealed Unit, High Temperature / High Pressure Equipment

✅ Turbine Thrust Disk, Hydro Turbine Shaft, Compressor Rotor Monitoring

✅ Space Constrained, Short Distance Installation (5m), Ordinary Non-Explosion-proof Area

IV. Comparison of Key Models in the Same Series (50mm Probe) Table

Model Thread Length Cable Approval Applicable Scenarios

330876-02-50-00-00 M14×1.5 5m High-temperature non-armored No Short distance + Common high-temperature / Hydrogen zone

330876-02-90-00-00 M14×1.5 9m High-temperature non-armored No Long distance + Common high-temperature / Hydrogen zone

330876-02-50-01-00 M14×1.5 5m High-temperature armored No Short distance + Strong mechanical protection

330876-02-50-00-05 M14×1.5 5m High-temperature non-armored Explosion-proof Short distance + Hazard zone (Oil and Gas)

V. Installation and Calibration Key Points

Gap Calibration: Zero gap ≈ -24V; 10mm ≈ -20V; 40mm ≈ -4V; Recommended working point 20mm (≈ -16V).

Thread Installation: M14×1.5 thread, tightening torque ≈ 25Nm; Insulate the shell from the equipment to avoid ground current.

Cable Installation: Non-armored cable avoid crushing / bending (minimum curvature radius ≥ 50mm); Appropriate for FluidLoc temperature resistance in high-temperature zone.

Length Strict Matching: 5m probe must be paired with 5m pre-coupler (330878-50-XX), cannot be truncated or mixed with 9m pre-coupler.

VI. Common Confusion Clarification

❌ Not 8mm/25mm probe: 330876 is exclusive for 50mm large gap, cannot be mixed with 330180 (8/25mm).

❌ Not pre-coupler: Pre-coupler is 330878 (blue box), probe is 330876 (with long cable).

✅ Short-distance high-temperature / Hydrogen zone specific: 5m short length is suitable for space-constrained scenarios, ceramic head resistant to hydrogen embrittlement, suitable for hydrogen-cooled generators.

Usage: Axial displacement measurement for large units (steam turbines, water turbines, compressors); Large gap radial vibration measurement, differential expansion, key phase measurement; **5m short system, high-temperature / Hydrogen environment, ordinary zone (without explosion-proof)** specific.