Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 18745-03 |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Product Type | Proximitor Sensor / Eddy Current Signal Conditioner |
| Series | 7200 Series Proximity Transducer System |
| Compatible Probes | 7200 Series 5 mm and 8 mm proximity probes |
| System Length | 5 metres (16.4 ft) combined probe and extension cable length |
| Scale Factor | 200 mV/mil (7.87 V/mm) ±5% |
| Linear Range | 80 mils (2.0 mm) |
| Linearity | Within 0.8 mils (0.02 mm) of the 200 mV/mil line |
| Frequency Response | 0 Hz (DC) to 10 kHz (–3 dB) |
| Input Power | –17.5 Vdc to –26 Vdc, 12 mA maximum (–24 Vdc nominal) |
| Output Signal | DC gap voltage, nominally –2 Vdc to –18 Vdc over the linear range |
| Target Material | AISI 4140 steel standard calibration (custom calibration available) |
| Operating Temperature | –51 °C to +100 °C (–60 °F to +212 °F) |
| Storage Temperature | Approximately –55 °C to +120 °C |
| Mounting | DIN rail or flat panel mounting in a junction box or enclosure |
| Dimensions | Approximately 102 mm × 114 mm × 132 mm (also quoted as 50.8 mm × 79.2 mm × 60.5 mm depending on case revision) |
| Approximate Weight | 0.22 kg to 0.23 kg |
| System Compatibility | Bently Nevada 3300, 7200 and 9000 monitoring systems; API 670 compliant installations |
Main Features and Advantages
True non-contact measurement: Because the Bently Nevada 18745-03 works on the eddy current principle, nothing touches the shaft, so there is no wear, no friction loading and no consumable contact element to replace. This allows the same channel to report static gap — for thrust position and eccentricity — and dynamic motion — for radial vibration — from one permanently installed probe, which is exactly what continuous machinery protection requires on machines that cannot be stopped for inspection.
Industry-standard calibration: The 200 mV/mil (7.87 V/mm) scale factor and the 80 mil linear range of the Bently Nevada 18745-03 are the reference values that monitor modules, DCS scaling and portable analyzers already expect, so replacement does not require re-engineering of alarm setpoints or re-scaling of trending data. Calibration is performed against AISI 4140 steel as standard, and custom calibration is available for shafts of other materials, which matters on stainless or non-standard rotors where an uncalibrated channel would read incorrectly.
Wide bandwidth for real diagnostics: With response from DC to 10 kHz, the Bently Nevada 18745-03 captures slow rotor bow during a cold start and high-frequency vibration events during operation on the same channel. Maintenance teams therefore see not only the amplitude of a vibration problem but the character of it — the difference between imbalance, misalignment, oil whirl and rub — which is what turns a trip record into an actionable diagnosis.
Matched-system accuracy: The Bently Nevada 18745-03 is tuned for a defined total electrical length, and its internal circuitry compensates for the distributed capacitance of the coaxial cable so that linearity does not drift after long cable runs. This is the reason the 5-metre configuration is identified in the part number: installing a proximitor tuned for the wrong length on an existing probe and cable introduces scale error that no amount of commissioning adjustment will remove.
Built for the plant environment: Rated from –51 °C to +100 °C and supplied in a sealed, industrial case, the Bently Nevada 18745-03 performs on turbine pedestals, compressor skids and pump bases where temperature, humidity and electromagnetic noise are constant companions, and its output is a robust DC voltage that travels cleanly to the monitoring rack rather than a low-level signal vulnerable to interference.
