Overview
Suffix Breakdown & Model Matrix
The supplied technical information identifies 129716-XXX-032-90-05 as a drawing-controlled configuration. Therefore, the suffixes are retained as the complete ordering designation.
The available data does not define the electrical or mechanical meaning of each suffix position. Consequently, no independent suffix decoding is stated for XXX, 032, 90, or 05. The exact assembly configuration should be verified against the applicable OEM drawing or Bently Nevada documentation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | Bently Nevada 129716-XXX-032-90-05 |
| Base Model | 129716 |
| Brand | Bently Nevada |
| Product Family | 3300 XL 8 mm Proximity Transducer System |
| Product Type | Proximity Transducer Assemblies |
| Configuration | Drawing-controlled OEM configuration |
| Measurement Principle | Non-contact eddy-current displacement measurement |
| Linear Measurement Range | 2.0 mm, approximately 80 mils |
| Usable Measurement Region | Approximately 0.25 mm to 2.3 mm, or 10 to 90 mils |
| Incremental Scale Factor | 7.87 V/mm, equivalent to 200 mV/mil, +/- 5% |
| Frequency Response | 0 Hz to 10 kHz, -3 dB |
| Output Impedance | 50 ohm |
| Power Supply Requirement | -17.5 VDC to -26 VDC when used with a compatible 3300 XL Proximitor Sensor |
| Maximum Power Consumption | 12 mA maximum |
| Probe Tip Material | Polyphenylene sulfide, PPS |
| Cable Type | Fluid-resistant coaxial cable; stainless steel armor depends on the exact configuration |
| Probe Tip and Cable Operating Temp | -51 deg C to +177 deg C |
| Proximitor Sensor Operating Temp | -51 deg C to +100 deg C |
| Hazardous Area Compliance | CSA, ATEX, and IECEx certifications may apply depending on the complete system configuration |
| Machinery Protection Standard | Designed for applications associated with API 670 machinery monitoring requirements |
Eddy-Current Probe Scaling and Gap Voltage Validation
The 3300 XL measurement chain converts changes in the distance between the probe tip and the conductive shaft surface into a DC output signal. The specified incremental scale factor is 7.87 V/mm, equivalent to 200 mV/mil, within the stated tolerance.
Correct system performance depends on the matched probe, extension cable, and Proximitor Sensor configuration. Therefore, replacement components should not be mixed without confirming the required total system electrical characteristics.
During commissioning, technicians commonly verify the static gap voltage before interpreting dynamic vibration data. A nominal gap voltage near -10 VDC is widely used as a practical setup target for many Bently Nevada eddy-current probe applications; however, the final acceptance value must follow the applicable system calibration and OEM shaft material requirements.
Proper gap validation supports accurate rotor dynamics measurements and helps maintain the expected linear operating region. In addition, controlled cable routing and physical separation from high-energy conductors reduce external interference and unwanted signal coupling.
Frequently Asked Questions
Q: Can the Bently Nevada 129716-XXX-032-90-05 be replaced with an arbitrary 3300 XL 8 mm probe assembly?
A: No. The supplied part number is identified as a drawing-controlled OEM configuration. The complete probe, cable, and Proximitor Sensor characteristics should be verified against the applicable OEM drawing before substitution.
Q: Why must the probe gap voltage be checked during installation?
A: The DC gap voltage indicates the probe operating position relative to the target. A correctly established gap helps place the measurement point within the calibrated linear region before vibration or displacement signals are evaluated.
Q: What cable installation practices help reduce measurement interference?
A: Route the transducer cable away from high-current power conductors, variable-frequency drive output cables, and strong electromagnetic sources. Maintain cable integrity, avoid unnecessary splices, and follow the specified shielding and grounding practices for the complete monitoring system.
Field Installation Guidelines
Verify the complete Bently Nevada 129716-XXX-032-90-05 configuration against the applicable drawing-controlled documentation before installation.
Install the probe so that the sensing tip maintains the required mechanical clearance from the shaft throughout the expected rotor movement range. Confirm that the target surface is compatible with the calibration requirements of the matched transducer system.
Set and validate the static gap before commissioning dynamic measurements. Do not use vibration data as a substitute for confirming the correct mechanical and electrical operating position.
Route coaxial cables separately from high-current conductors and variable-frequency drive output wiring. Avoid sharp bends, crushing, abrasion, and unnecessary cable joints.
Maintain the specified shielding and grounding arrangement throughout the complete transducer chain. In addition, keep probe and extension cable connections clean and mechanically secured to prevent intermittent signal changes.
After installation, verify the DC output condition, signal polarity, and dynamic response using the procedures specified for the associated 3300 XL machinery monitoring system.
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