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330878-90-05

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330878-90-05
May 23, 2026

330878-90-05

I. Model Analysis (330900-A-B) 330900: Special installation housing for 3300 XL NSv probe 50: Shell length 5.0 in (127mm) 00: Standard configuration (no special options) II. Core Parameters 1. Mechanical Specifications Material: Stainless steel (316SS), corrosion-resistant and durable Length: 127mm (5.0in) Compatible probes: 330901 (1/4-28), 330908 (3/8-24) etc. NSv series Installation method: Threaded fixation (matching probe outer diameter) Sealing: Viton® O-ring, withstands -40°C to +120°C Protection level: IP67 (dust and water protection) Weight: Approximately 0.15kg 2. Application Scenarios Narrow spaces: Through holes, limited side view, insufficient depth installation positions Small shaft diameters: Radial vibration/ displacement measurement for shafts with a diameter of < 51mm Harsh environments: Oil and gas, chemical, power generation, etc. high-temperature / humid / vibration conditions III. System Compatibility (must be a complete set) 1. Compatible with probes (example) 330901-00-13-05-02-00 (1/4-28 thread, ultra-short housing) 330908-09-51-05-02-05 (3/8-24 thread, short housing explosion-proof) 2. Complete system composition Probe: 3309XX (NSv series) Housing: 330900-50-00 (installation fixation) Extension cable: 330930-XXXX (matching length) Preamplifier: 330980-50-00 (5m system) Monitoring module: 3500/40M (vibration), 3500/50M (phase) IV. Comparison with similar models Table Model Length Material Compatible Probe Scene 330900-50-00 127mm 316SS 330901/330908 Standard length, universal 330900-70-00 177.8mm 316SS 330901/330908 Long body, deep hole installation V. Installation Points Thread matching: Ensure that the shell thread is completely consistent with the probe thread (1/4-28 or 3/8-24). Sealing installation: The O-ring must be in place to prevent oil and water vapor from entering and affecting measurement accuracy. Insulation floating: The shell is insulated from the equipment to prevent ground current interference with the signal. Length matching: The probe cable + extension cable = the nominal length of the preamplifier (e.g., 0.5 + 4.5 = 5.0m). 330878-90-05 (Bently Nevada 3300 XL 50mm preamplifier) Model: 330878-90-05 Brand: Bently Nevada (Baker Hughes) Series: 3300 XL 50mm large gap eddy current sensor system Type: Preamplifier (Proximitor), blue cast aluminum housing Usage: Axial displacement, large gap radial vibration, phase monitoring for large-scale units (steam turbines / hydro turbines / compressors); compatible with 50mm probe, total system length 9.0m, with multiple explosion-proof / safety certifications. VI. Common Confusion Clarification ❌ Not a probe: Probe model is 330901/330908 (with 6-digit code). ❌ Not a preamplifier: Preamplifier model is 330980 series (blue housing). ✅ Shell: Only used for mechanical installation, without electronic components.

Description

I. Model Analysis (330878-A-B)

330878: 3300 XL 50mm Large Gap Preamplifier (Corresponding Probe 330879)

90: Total System Length 9.0m (Probe + Extension Cable Total Length), Panel Installation

05: Multi-Country Certification (CE, UL, CSA, ATEX, IECEx), Explosion-proof / Hazard Zone Available

II. Core Parameters

1. Electrical Characteristics

Compatible Probe: 330879-XX-XX (50mm Large Gap Eddy Current Probe)

Measurement Range: 0 - 50mm (Linear Range 2 - 45mm, Compatible with 4140 Steel)

Sensitivity: 40mV/mm (±5%)

Frequency Response: 0 - 5kHz

Input Impedance: 50Ω

Output: -24V - 0V Direct Current (Proportional to Gap)

Power Supply: +18 - +30V DC (Typical 24V)

Power Consumption: ≤ 150mA

2. Mechanical and Environmental

Material: Cast Aluminum A380, Blue Coating

Installation: Panel Installation (Insulated Base Board, No Additional Insulation Required)

Size: Approximately 114 × 70 × 35mm

Weight: ≈ 0.4kg

Temperature: -40°C - +85°C (Operation); -51°C - +105°C (Storage)

Protection: IP65

Certification: 05 = CE/UL/CSA/ATEX/IECEx (Explosion-proof Ex ia IIC T4 Ga)

III. System Compatibility (Complete Set of 50mm Large Gap)

Probe: 330879-0X-XX (50mm, e.g. 330879-02-00)

Extension Cable: 330880-XXX-XX (Length Matched, e.g. 330880-085-00)

Preamplifier: 330878-90-05 (9.0m, Multi-Country Certification)

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

Applicable Scenarios: Large Shaft Diameter (> 200mm), Large Gap (10 - 40mm), High Vibration, Hazard Zone (Oil/Gas / Chemical)

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

Model Length Installation Approval Applicable Scenarios

330878-90-05 9.0m Panel Multi-Defense Explosion Proof Standard Long Distance + Hazard Zone

330878-90-00 9.0m Panel No Ordinary Environment

330878-50-05 5.0m Panel Multi-Defense Explosion Proof Short Distance + Hazard Zone

V. Installation and Commissioning Key Points

Length must be strictly matched: probe cable + extension cable = 9.0m (nominal of the preamplifier), no cutting / splicing allowed.

Large gap calibration: 50mm probe zero gap ≈ -24V, 10mm ≈ -20V, 40mm ≈ -4V, linear zone 2 - 45mm.

Explosion-proof installation: Hazard zone requires sealed joints, armored cable, single-ended grounding (on the preamplifier side).

Insulation installation: Preamplifier base plate insulation to avoid ground circulation interference.

VI. Common Confusion Clarification

❌ Not the probe: The probe is 330879 (with long cable), the preamplifier is 330878 (blue box).

❌ Not 8mm/25mm: 330878 is exclusive for 50mm large gap, cannot be mixed with 330180 (8/25mm).

✅ It is for large displacement dedicated: suitable for axial/radial monitoring of turbine thrust disk, hydro turbine rotor, compressor rotor.


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