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The 18745-04 proximity transducer from Bently Nevada measures shaft displacement inside turbine and compressor protection systems. Plant engineers install this transducer whenever rotor position and vibration demand precise, non-contact measurement. Consequently, it delivers reliable displacement data to the monitor rack without touching the rotating shaft.
Key Technical Specifications
The table below outlines the main physical and electrical parameters of the 18745-04 transducer.
| Parameter | Specification |
|---|---|
| Product Type | Proximity Transducer |
| Compatibility | Bently Nevada 3300 / 3500 series systems |
| Probe Diameter | Standard proximity probe tip |
| Overall Length | Configurable cable length options |
| Weight | Approximately 0.3 kg (0.66 lbs) |
| Mounting | Threaded probe holder or mounting bracket |
| Interface | Coaxial cable to monitor input |
| Connectors | Coaxial connector and probe tip |
| Component Count | Probe tip, coil assembly, cable, and connector |
| Energy Storage | Not applicable for this passive transducer |
| Measurement Range | Configurable linear displacement range |
| Operating Temperature | -35 degrees C to 177 degrees C |
| Storage Temperature | -40 degrees C to 85 degrees C |
| Humidity | 5% to 95% non-condensing |
Functional Overview
This transducer generates an eddy current field that responds to shaft surface proximity. Therefore, it converts displacement into an electrical signal the monitor can read. The 18745-04 also withstands high temperatures near turbine bearings and seals. Meanwhile, its coaxial cable carries the signal to the monitor without interference.
Installation and Handling Notes
Always set the probe gap voltage to the specified value before tightening the holder. In addition, route the coaxial cable away from power wiring to reduce noise. Secure the cable with clamps so it cannot flex during operation. Finally, verify linearity across the measurement range.