Product Introduction: 84141-01
The 84141-01 is a Vibration Sensor Preamplifier, often referred to as a "proximitor" in the context of Bently Nevada and related machinery monitoring systems. This module is a critical signal conditioning component designed to work with eddy-current proximity probes. It provides the high-frequency radio frequency (RF) signal to power the probe and then amplifies, demodulates, and conditions the returning signal to produce two key outputs: a dynamic AC signal proportional to vibration (for analyzing the motion of the shaft) and a static DC signal proportional to the average gap between the probe tip and the shaft (for measuring position).
Technical Parameters
The key technical specifications for the 84141-01 preamplifier are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 84141-01 |
| Type | Proximitor / Vibration Preamplifier |
| 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 |
| Output Signals | • Dynamic Vibration (AC): -1 to -11 VDC (scale factor: 200 mV/mil) • Average Gap (DC): -2 to -18 VDC (scale factor: 200 mV/mil) |
| Frequency Response | 0 to 10,000 Hz (+1%, -3%) |
| Power Supply | +20 to 32 VDC |
| Linearity | Within ±1% of full scale |
| Operating Temperature Range | -20°C to +80°C |
Application Scenarios
This proximitor is a fundamental component in systems monitoring radial vibration and axial position of rotating machinery.
Shaft Vibration Monitoring on Turbines and Compressors:
Used to condition signals from proximity probes monitoring radial vibration on critical equipment like steam turbines, gas turbines, and centrifugal compressors to detect imbalance, misalignment, and shaft cracks.
Axial Thrust Position Monitoring:
Essential for monitoring the axial position of a rotor to prevent catastrophic damage from excessive thrust bearing wear or failure in machines like turbines and large pumps.
Eccentricity and Differential Expansion:
Used in applications to measure slow-roll shaft bow (eccentricity) and the differential thermal growth between a rotor and its casing (DE) in large steam turbines.
Integration with Monitoring Systems:
The conditioned DC (gap) and AC (vibration) output signals are designed to be connected to the input channels of machinery monitoring systems (like the Bently Nevada 3500) or data acquisition systems for alarm and shutdown functions.
General Rotating Machinery Protection:
Provides the essential signal conditioning for any application using eddy-current probes for precise, non-contact measurement of shaft relative motion.
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7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
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