Bently Nevada 32000-16-05-04-135-03-02 Proximity Probe

Bently Nevada's 32000 series is its classic vibration monitoring system, of which 32000-16-05-04-135-03-02 is an eddy current proximity probe in the series. The following is a detailed analysis from multiple dimensions:

1. Model code analysis

Each segment of numbers/letters in the model represents a specific meaning, which can help understand the specifications and functions of the probe:

32000: represents Bently Nevada 32000 series vibration monitoring system;

16: Probe diameter, usually 16mm (common specifications include 8mm, 25mm, etc.);

05: Probe length, in inches (for example, 05 may represent 5 inches, about 127mm);

04: Probe cable type or connection method (different numbers correspond to different cable materials, shielding layers or interface designs);

135: Probe operating temperature range or special coating (for example, 135 may indicate temperature resistance of 135℃, or special treatment for high temperature environment);

03: Cable length, in meters (for example, 03 represents 3 meters);

02: Calibration coefficient or output characteristics (different numbers correspond to different linear ranges, sensitivities, etc.).

2. Working Principle

The eddy current proximity probe works based on the eddy current effect:

The probe contains a high-frequency oscillating coil inside, which generates an alternating magnetic field when powered on;

When a metal object to be measured (such as the shaft of a rotating machine) approaches the probe, eddy currents are induced on the metal surface, and the reverse magnetic field generated by the eddy currents weakens the oscillation amplitude of the probe coil;

The internal circuit of the probe converts the change in oscillation amplitude into a voltage or current signal (usually -20V to 0V DC voltage, or 4-20mA current) that is linearly related to the distance of the object to be measured, and transmits it to the monitoring system through a cable.

3. Core Features

Non-contact measurement: No need to contact the object to be measured, avoid wear, suitable for shaft displacement, vibration, and speed monitoring of high-speed rotating machinery (such as turbines, compressors, generators, etc.). High precision and stability:

The linear measurement range is usually 0.5-2.5mm (depending on the model), the sensitivity can reach 7-10V/mm, and the resolution can reach micron level;

It has strong anti-interference ability and is not affected by environmental factors such as oil, dust, and water vapor, which is suitable for harsh working conditions in industrial sites.

High temperature resistance and long life:

The probe body can withstand temperatures from -30℃ to +200℃ (some models are higher), and the cable material can adapt to different temperature zones according to different models;

No mechanical moving parts, long service life, and low maintenance cost.

IV. Application Scenarios

Mainly used for status monitoring of rotating machinery, including:

Shaft displacement monitoring: detect the axial position change of the rotor relative to the bearing to prevent dynamic and static friction (such as turbine shaft displacement protection);

Vibration measurement: monitor the radial vibration amplitude and frequency of the shaft to determine whether the machinery has imbalance, misalignment, bearing wear and other faults;

Speed measurement: output pulse signals through the probe's induction of the gear (or keyway) on the shaft to calculate the speed (such as speed calibration before the generator is connected to the grid);

Key phase detection: used in conjunction with the key phaser to determine the initial position of the rotor for phase positioning in vibration analysis.