Bently Nevada 330780-91-00

Product Overview

330780-91-00 is a 3300 XL 11mm proximity Sensor produced by Bently Nevada, a subsidiary of Baker Hughes. The 330780-91-00 is the core electronic unit in the eddy current displacement/vibration measurement system, responsible for working in coordination with the 3300 XL 11mm probe to convert the minute gap changes sensed by the probe into standard, easy-to-transmit and process DC voltage signals.

The preamplifier is the "brain" and "power source" of the entire measurement chain. High-frequency and stable excitation signals are provided to the probe through the integrated cable, and the impedance signals returned by the probe that vary with the gap are received. After being processed by the internal precise demodulation and amplification circuits, the preamplifier outputs a standard signal ranging from -2.0Vdc to -18.0Vdc that is linearly proportional to the probe-to-target surface gap. The total system length of 9.0 meters of 330780-91-00 makes it particularly suitable for application scenarios where the distance between the probe and the monitoring system cabinet is relatively long. The DIN rail installation method facilitates rapid and standardized installation and maintenance within the control cabinet.

Product Parameters

Product type                              3300 XL 11mm Proximitor Sensor

Complete part number PN           330780-91-00

Compatible probes                      3300 XL 11mm series probes

Total system length                     9.0 meters /29.5 feet. This length is the sum of the probe, the extension cable and the cable inside the preamplifier.

Linear range                              4.0 mm

Sensitivity                                  4.0 mV/μm

Output range                             -2.0Vdc to -18.0Vdc

Frequency response                    0.0Hz (DC) to 8.0kHz (-3 dB), suitable for static displacement and dynamic vibration measurement.

Power supply requirement           -24 Vdc, typical current consumption 20 mA.

Output drive capability                can drive 300-meter (1000-foot) shielded twisted-pair cables to high-impedance loads.

Operating temperature range      -30°C to +85°C

Installation method                    DIN rail mounting

Institutional certification             No special requirements

Product Functional Features

Precise signal conditioning and long-distance driving

High linearity and stability. The interior adopts precise analog circuits and temperature compensation technology, providing excellent linearity throughout the entire 4.0mm range and ensuring stable performance over a wide temperature range. It serves as the foundation for accurate measurements of shaft displacement, expansion difference, etc.

Strong output-driven capability. The output circuit design of 330780-91-00 can drive cables up to 300 meters long, which means that the preamplifier can be installed in the central control room far from the on-site probes without signal attenuation or distortion due to long-distance transmission, greatly enhancing the flexibility and anti-interference ability of the system.

Optimized specifically for 11mm systems

The electrical characteristics of this preamplifier are perfectly matched with the 3300 XL 11mm probe. This end-to-end system calibration ensures that the entire signal chain from the probe tip to the monitoring room complies with the performance indicators promised in the specification.

Compared with the 8mm system, the 11mm system offers a larger linear measurement range, making it highly suitable for applications that require a wide range, such as measuring large axial displacements and differential expansion of medium and high pressure cylinders.

Industrial-grade robustness and easy installation

The wide operating temperature range of -30°C to +85°C enables it to adapt to various harsh environments, from cold northern oil fields to hot tropical refineries.

The 330780-91-00 adopts a standard DIN rail clip design, allowing for quick installation or disassembly without screws, which greatly facilitates system integration, debugging and later maintenance. The modular installation method also ensures a neat layout and good heat dissipation within the cabinet.