Description
Bently Nevada 129716‑173‑037‑15‑05 3300‑XL 8 mm Standard Eddy‑Current Proximity Probe Assembly (Hazardous‑Area Approved)
Product Overview
The 129716‑173‑037‑15‑05 is a front‑mount non‑contact eddy‑current proximity probe from Bently Nevada 3300‑XL 8 mm transducer family, adopting legacy Microdot interface. This probe converts shaft‑to‑tip clearance into proportional voltage signal, used for dynamic shaft‑relative radial vibration, static thrust position monitoring, and Keyphasor rotational speed / phase reference measurement on rotating machinery. It meets API‑670 turbomachinery protection requirements. The final ‑05 suffix provides multi‑agency hazardous‑area intrinsic‑safety certifications for explosive classified zone deployment.
Critical Compatibility Warning
- This is legacy Microdot interface probe. It works exclusively with 3300‑XL Microdot‑type extension cables (330130 series). NOT compatible with NSv ClickLoc system (330930 / 330905 series).
- Total calibrated transducer length = probe built‑in pigtail length + Microdot extension cable length. The summed value must match the length setting of paired proximitor unit. Mismatched total length will result in scale‑factor deviation and measurement error.
- Probe integrated pigtail terminates with straight Microdot 10‑32 connector. Never splice or modify factory‑molded probe‑cable assembly. Always verify intrinsic‑safety label on physical hardware before hazardous‑area installation.
Part Number Decoding
- 129716：Base part number for 8 mm standard front‑mount proximity probe
- ‑173：Probe housing overall length: 173 mm
- ‑037：Mounting thread specification: 3/8‑24 UNF
- ‑15：Integral pigtail cable length: 1.5 m non‑armored
- ‑05：Certification option: ATEX / IECEx / CSA multi‑hazardous‑area intrinsic‑safety approvals
129716-173-037-15-05
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | 129716‑173‑037‑15‑05 |
| Series | 3300‑XL 8 mm Microdot Eddy‑Current Proximity Probe |
| Measurement Principle | Non‑contact eddy‑current displacement |
| Nominal Sensitivity | 7.87 V/mm (200 mV/mil), ±5 % tolerance |
| Linear Measurement Range | 0.25 mm ~ 2.0 mm (10‑80 mil) |
| Probe Tip Diameter | 8 mm |
| Mounting Thread | 3/8‑24 UNF |
| Housing Length | 173 mm |
| Integral Pigtail Length | 1.5 m, non‑armored FEP insulated |
| Connector Type | Straight Microdot 10‑32 coaxial |
| Frequency Response | 0 Hz‑10 kHz |
| Operating Temperature Range | ‑52 °C ~ +177 °C |
| Housing Material | 316 stainless steel |
| Certifications | API‑670 compliant; ATEX, IECEx, CSA intrinsic‑safety approvals |
| Country of Origin | USA |
| Weight | ≈0.31 kg |
Main Features
- Front‑mount mechanical configuration: Standard 3/8‑24 UNF thread, 173 mm housing length, widely used for bearing‑housing direct installation on turbines, compressors.
- 1.5 m factory‑calibrated non‑armored integral pigtail with straight Microdot connector: Matches 330130 series Microdot tri‑axial extension cables to achieve required total transducer loop length.
- Multi‑agency hazardous‑area intrinsic‑safety certifications (‑05 suffix): Qualified for petrochemical, refinery and oil‑gas classified explosive zone applications.
- Stable linear performance and wide operating temperature range: Resists oil‑mist, humidity and continuous machinery vibration, satisfies API‑670 protection requirements for critical rotating equipment.
- Full interoperability within legacy 3300‑XL Microdot transducer ecosystem.
Typical Application Scenarios
- Shaft‑relative radial‑vibration and axial thrust‑position protection for steam turbines, gas turbines, centrifugal compressors
- Keyphasor phase reference and shaft rotational‑speed detection for fluid‑film‑bearing rotating machinery
- Refinery, petrochemical and power‑plant projects requiring ATEX / IECEx hazardous‑area certified Microdot‑type proximity transducers
- New‑project integration with Bently Nevada 3500 rack Microdot‑compatible proximitor channels
- Spare‑part replacement for existing legacy Microdot proximity measurement loops
Related & Recommended Alternative Models
| Model | Description |
|---|---|
| 129716‑173‑037‑15‑00 | 1.5 m pigtail front‑mount probe, without hazardous‑area approvals |
| 129716‑173‑037‑10‑05 | 1.0 m integral pigtail variant, multi‑hazardous‑area approvals |
| 129716‑173‑037‑20‑05 | 2.0 m integral pigtail variant, multi‑hazardous‑area approvals |
| 330130‑075‑00‑05 | 7.5 m non‑armored Microdot extension cable, dual‑end right‑angle Microdot |
| 330105‑02‑12‑05‑02‑05 | Reverse‑mount NSv ClickLoc probe (incompatible, reference‑only) |
Compatible Components & Accessories
- Extension Cables: 330130 series Microdot tri‑axial extension cables (straight / right‑angle types)
- Monitoring Hardware: 330180 series proximitor modules, Bently Nevada 3500 rack Microdot‑compatible monitor channels, Microdot‑type 990 transmitters
- Mechanical Accessories: Probe mounting lock‑nut, probe mounting shell, 43501‑02‑04‑02 low‑pressure cable‑seal assembly, 43574‑04 multi‑hole grommet
- Installation Consumables: Anti‑seize compound for mounting threads, cable clamps for strain‑relief, high‑temperature cable ties
- Calibration Tool: 8 mm 3300‑XL Microdot static gap calibration fixture
Installation and Configuration Guide
Warning: Installation must be performed by qualified instrument technicians. Always refer to original Bently Nevada 3300‑XL Microdot transducer‑system manual as primary reference. Verify intrinsic‑safety marking before deployment in explosive classified hazardous zones.
- Pre‑installation Total‑Length Calculation
- Calculate total transducer length = probe integral pigtail (1.5 m) + selected Microdot extension‑cable length.
- Confirm total length strictly matches calibrated‑length requirement of paired proximitor. Length mismatch causes scale‑factor error.
- Mechanical Probe Mounting
- Install matching probe mounting shell onto bearing housing.
- Apply anti‑seize compound to 3/8‑24 UNF threads; screw probe into mounting shell, adjust working gap to target value, fasten lock‑nut to specified torque.
- Ensure probe tip keeps safe clearance and no physical contact with rotating shaft surface.
- Cable Routing & Microdot Connector Mating
- Route tri‑axial transducer cable separately from high‑power AC, VFD and contactor wiring to reduce EMI interference.
- Observe minimum static bending radius ≥50 mm; avoid sharp kinks. Do not pull cable assembly by Microdot connector.
- Clean Microdot contact pins; align keyway and tighten to manufacturer‑specified torque value. Do not over‑torque.
- Install strain‑relief clamps adjacent to connector joint. Where cable penetrates machine casing, use approved cable‑seal fitting.
- System Commissioning
- Complete full transducer‑loop assembly and power‑up proximitor / monitoring rack.
- Read static gap voltage to validate mechanical gap setting. Perform static‑gap calibration test with 8 mm Microdot calibration fixture to confirm system scale‑factor.
- Clear Not‑OK fault status; configure alarm and trip thresholds according to project machinery specification.
- Maintenance & Troubleshooting
- During unit turnaround, check probe locking torque, Microdot connector for oil contamination and corrosion; inspect pigtail jacket for cracking or abrasion.
- Gap‑voltage drift, high noise level or persistent Not‑OK faults may be caused by loose Microdot joint, gap shift, cable damage or incorrect total transducer‑loop length.
- Replace complete probe assembly once pigtail or probe tip gets damaged; field splicing of factory probe cable is strictly prohibited.
Supplementary Remark
129716‑173‑037‑15‑05 is a legacy front‑mount 3300‑XL 8 mm Microdot eddy‑current proximity probe with 173 mm housing, 3/8‑24 UNF thread, 1.5 m integral pigtail and ATEX/IECEx/CSA multi‑hazardous‑area intrinsic‑safety certifications. It only works with Microdot‑type tri‑axial extension cables and proximitor hardware and cannot connect to NSv ClickLoc system. Before commissioning, cross‑check mounting dimension, total transducer‑loop length, Microdot interface and hazardous‑area approval against project BOM and mechanical drawings.
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