Product Introduction: 3300/55
The 3300/55 is a Dual-Channel DC Proximitor from the Bently Nevada 3300 monitoring series. This module is a signal conditioner and power supply designed specifically for use with eddy-current proximity probes. It provides the necessary RF excitation to the probes and conditions the returning signals to generate DC voltage outputs proportional to the gap between the probe tip and the target (shaft). It is a fundamental component for measuring shaft position, such as axial thrust, eccentricity, and differential expansion, in rotating machinery.
Technical Parameters
The key technical specifications for a standard 3300/55 module are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number Series | 3300/55 |
| Product Line | Bently Nevada 3300 |
| Type | Dual-Channel DC Proximitor (Signal Conditioner) |
| Mounting | DIN Rail or Panel Mount |
| Dimensions (L x W x H) | Approx. 120 mm x 80 mm x 40 mm |
| Weight | 0.35 kg |
| Input (To Probe) | -18 VDC to -24 VDC RF Supply (per channel) |
| Output Signal | DC Voltage proportional to gap (-2 to -18 VDC, 200 mV/mil scale factor) |
| Power Supply | +20 to 32 VDC |
| Linearity | Within ±1% of full scale |
| Frequency Response (DC) | 0 to 10 Hz |
| Operating Temperature Range | -20°C to +80°C |
Application Scenarios
This DC Proximitor is essential for precise, slow-changing positional measurements in critical rotating equipment.
Axial Position Monitoring:
Used with two probes to monitor the thrust position of a turbine or compressor rotor, providing critical protection against thrust bearing failure.
Eccentricity Monitoring:
Measures slow-roll bow or sag of a large turbine shaft during startup and shutdown to prevent seal rubs.
Differential Expansion (DE) Monitoring:
Measures the difference in thermal growth between a machine's rotor and its casing, which is critical for large steam turbines to avoid internal collisions.
Valve Position Monitoring:
Can be used to monitor the linear position of other components, such as large steam or gas valve stems.
Integration with Monitoring Systems:
The conditioned DC output signals are designed to be connected to the DC input channels of machinery monitoring systems (like the Bently Nevada 3500) for continuous tracking and alarm functions.
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