Product Introduction
The Bently Nevada 3300/61 is a Dual Vector Monitor from the 3300 Series machinery protection system. It is designed for continuous, online monitoring of shaft relative vibration on two independent axes (typically horizontal and vertical) using eddy‑current proximity probes. The module simultaneously measures vibration amplitude and phase angle for both channels, requiring a Keyphasor reference signal to provide phase information. The 3300/61 outputs vibration data (including vector information) for machinery protection, diagnostics, and balancing. It meets API 670 requirements for machinery protection systems. The module occupies a single slot in a 3300 Series rack and is compatible with 3300 Series proximitors and probes.
Parameters
| Parameter | Specification |
|---|---|
| Model / Part Number | 3300/61 |
| Product Type | Dual Vector Monitor (2‑channel) |
| Series | 3300 Series |
| Number of Input Channels | 2 (independent, for X and Y axes) |
| Input Type | Eddy‑current proximity probe (via 3300 Series proximitor) |
| Keyphasor Input | 1 (required for phase measurement) |
| Vibration Measurement | Peak‑to‑peak amplitude (µm or mils) and phase angle |
| Frequency Range | 0.1 Hz to 10 kHz |
| Outputs (per channel) | 4‑20 mA recorder output (optional), buffered dynamic signal |
| Alarm Outputs | Alert and Danger per channel (via backplane to relay modules) |
| Slot Width | 1 slot in 3300 Series rack |
| Dimensions (W × H × D) | 24.9 × 241.3 × 218.4 mm (0.98 × 9.50 × 8.60 in) |
| Weight | 0.45 kg (1.0 lb) |
| Operating Temperature | 0 to +65 °C (32 to +149 °F) |
| Storage Temperature | –40 to +85 °C (–40 to +185 °F) |
| Humidity | 5% to 95% non‑condensing |
| Input Impedance | 10 kΩ |
| Scaling Factor (with 3300 XL system) | 200 mV/mil (7.87 V/mm) |
| Compliance | API 670 |
Application Scenarios
Two‑Plane Vibration Monitoring on Turbomachinery – Installed on steam turbines, gas turbines, and centrifugal compressors to measure radial vibration in two orthogonal directions (X and Y) at each bearing. The vector data enables diagnosis of imbalance, misalignment, and bearing faults.
Rotor Balancing Support – The simultaneous measurement of amplitude and phase angle provides the data needed for single‑plane and two‑plane field balancing, reducing vibration levels without shutting down the machine for external balancing equipment.
Shaft Orbit Analysis – The X and Y vibration signals from the 3300/61 can be plotted against each other to generate shaft orbit diagrams, helping identify rubs, looseness, and fluid whirl instability.
Transient Analysis (Startup / Coast‑down) – When used with a Keyphasor, the module provides the phase reference required for Bode plots, polar plots, and waterfall diagrams, allowing engineers to identify critical speeds and rotor dynamic behavior.
Integration with 3300 Series Protection Systems – Works alongside 3300/50 speed monitors, 3300/32 relay modules, and 3300/20 display units to form a complete machinery protection solution in power plants, refineries, and petrochemical facilities.
Global direct procurement guarantee
All products are purchased directly from overseas original manufacturers or authorized channels, 100% guaranteed genuine quality, sufficient spot inventory, and comprehensive model coverage
Quality Commitment
Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
Flexible procurement plan
- Bulk order enjoys Friendship discount (2 pieces or more can be applied)
- Long-term cooperative customers can apply for priority supply
Full service support
7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
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On the basis of the same quality, we provide:
- More competitive price system
- Faster logistics response
- More complete technical support (free product technical documentation)
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