Introduction
The part number 21000-28-05-15-028-04-02 refers to a highly specific configuration of a Proximity Transducer System (PTS), a critical component for monitoring rotating machinery. This part number typically defines a complete kit that includes a proximity probe, extension cable, and a proximity driver (oscillator/demodulator).
This system is used to measure the relative displacement and vibration of a metal shaft relative to its bearing housing. It operates on the eddy current principle: the probe generates a high-frequency magnetic field, and changes in the gap between the probe tip and the shaft cause changes in the field, which are converted into a DC voltage proportional to the distance. This provides vital data for machine protection, including shaft position (eccentricity), vibration amplitude, and phase reference (Keyphasor®).
Key Parameters
The following table outlines the typical specifications for a proximity transducer system matching this part number structure.
| Parameter Category | Specification |
|---|---|
| Part Number | 21000-28-05-15-028-04-02 |
| System Type | Proximity Transducer System (Kit) |
| Components | Probe, Extension Cable, Proximitor |
| Measurement | Relative Shaft Displacement (Vibration and Position) |
| Linear Range | 0 to 2.0 mm (0 to 80 mils) standard for a -28 probe |
| Scale Factor | 200 mV/mil (7.87 V/mm) |
| Target Material | 4140 Steel or equivalent (material-specific calibration) |
| Output Signal | -2 V to -18 V DC (Gap Voltage) & 0 to -24 V AC (Dynamic Vibration) |
| Power Supply | -24 V DC to -26 V DC (typical for Proximitor) |
| Operating Temperature | Probe: -30 °C to +150 °C Cable: -30 °C to +150 °C Proximitor: -30 °C to +80 °C |
| Probe Tip Material | PEEK (Polyether Ether Ketone) or High-Temperature Plastic with sensing coil |
| Probe Body Material | 316 Stainless Steel |
| Cable Material & Jacket | Stainless Steel Braid with High-Temperature FEP/Teflon® Jacket |
| Probe Dimensions | Approx. 40 mm (1.57 in) length x 8 mm (0.31 in) diameter (standard 8mm probe) |
| System Weight | Approx. 1.2 kg (2.65 lbs) for the entire kit |
Application Scenarios
Proximity Transducer Systems like this one are the primary means of monitoring radial and axial displacement in high-speed turbomachinery. Their key application scenarios include:
Radial Vibration Monitoring on Critical Rotors:
Turbines, Compressors, and Large Pumps: Installed in X and Y orientations perpendicular to the shaft to measure the shaft's dynamic motion within the bearing clearance. This is essential for detecting unbalance, misalignment, and oil whirl, and for triggering machine trips to prevent catastrophic damage.
Axial Position Thrust Monitoring:
Used to monitor the position of the thrust collar within its bearing to detect excessive thrust load, which can occur during startup, shutdown, or due to process upsets. This protects the machine from catastrophic thrust bearing failure.
Eccentricity (Slow-Roll) Measurement:
Measures the mechanical runout or bow of a shaft when it is rotating at slow speeds (below its first critical speed). This helps distinguish between actual dynamic vibration and mechanical runout.
Keyphasor® Reference for Diagnostics:
A single probe is used as a Keyphasor® to provide a once-per-turn timing pulse. This signal is fundamental for measuring phase lag, which is critical for rotor balancing, determining the mode shape of vibration, and creating orbit and trend plots for advanced diagnostics.
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