Description

The Bently Nevada 135031-01 is an industry-standard 8mm diameter eddy current proximity probe, engineered for high-accuracy vibration and position monitoring in critical turbomachinery. As part of the globally deployed 3300 XL series, this sensor delivers reliable non-contact measurement of shaft displacement, eccentricity, and speed with a temperature-stable sensitivity of 200 mV/mil (±5%). The 135031-01 features an integrated 5-meter (16.4 ft) armored cable terminated with a MIL-C-5015 connector, designed for permanent installation in harsh environments up to 125°C (257°F). Its epoxy-filled stainless-steel construction resists corrosion from steam, oil, and chemicals while providing EMI immunity for signal integrity.

Calibrated to API 670 standards, the Bently Nevada 135031-01 interfaces seamlessly with monitoring systems like the 3500 series through proximitor interfaces (e.g., 3500/20). The probe’s linear operating range of 0.25–2.25 mm (10–90 mils) covers most machinery clearance monitoring requirements, with a frequency response up to 12 kHz to capture dynamic events like blade pass vibrations. For gas turbines, compressors, and pumps requiring SIL 2 compliance, this probe enables early detection of misalignment, bearing wear, and rotor instability – forming the frontline defense against catastrophic failures.

BENTLY 135031-01

Technical Specifications

Parameter Name	Parameter Value
Product Model	135031-01
Manufacturer	Bently Nevada (Baker Hughes)
Product Type	Eddy Current Proximity Probe
Diameter	8 mm (0.315 in)
Sensitivity	200 mV/mil (7.87 mV/µm)
Linear Range	0.25–2.25 mm (10–90 mils)
Operating Temperature	-40°C to +125°C (-40°F to +257°F)
Cable Length	5 m (16.4 ft) with armor
Connector	MIL-C-5015 (3-pin)
Frequency Response	0 to 12 kHz (±3 dB)
Target Material	AISI 4140 Steel (or equivalent)
Output Gap Voltage	-2 to -18 VDC
Certifications	API 670, ATEX/IECEx Ex ia IIC T4

Main Features and Advantages

Robust Environmental Protection: Hermetically sealed 316 stainless-steel housing and mineral-insulated cable withstand high-pressure washdowns (IP68) and corrosive chemicals in offshore/petrochemical installations.

Plug-and-Play Interoperability: Factory-calibrated to mate with Bently Nevada proximitors (e.g., 3300 XL 8mm Proximitor) without field tuning. MIL-C-5015 connector ensures vibration-resistant terminations.

Advanced Diagnostics: Integrated cable armor shields against EMI/RFI interference, maintaining signal fidelity in electrically noisy environments like VFD-driven motors. Tip insulation resistance >100 MΩ at 500 VDC prevents grounding faults.

Long-Term Stability: Laser-welded construction and epoxy encapsulation eliminate internal movement. Temperature drift <0.1%/°C ensures consistent gap voltage output across thermal cycles.

Application Field

The Bently Nevada 135031-01 is indispensable for rotating equipment protection across energy and industrial sectors. In combined-cycle power plants, it monitors gas turbine generator shaft runout during startup to prevent rub-induced failures. Refineries deploy this probe on hydrocracker centrifugal compressors for thrust bearing position monitoring, integrating with 3500/42M relay modules for SIL 2 shutdowns.

For water injection pumps offshore, the 135031-01 detects impeller imbalance caused by cavitation, while paper mills use it on turbo-blowers to track rotor stability at 10,000+ RPM. Wind turbine gearboxes leverage its extended temperature range for high-speed input shaft monitoring. In nuclear facilities, the probe’s ATEX/IECEx certification allows deployment in containment buildings for reactor coolant pump surveillance.

BENTLY 135031-01

Related Products

3300 XL Proximitor®: Signal conditioner for 135031-01 probe.

149986-01: Extension cable kit (5m) for remote mounting.

3500/20: Vibration monitor module for system integration.

TK-3E Probe Tester: Calibration/validation tool for 135031-01.

3300/16: Transient Data Interface for waveform capture.

330701-00-000-050-10-00: High-temperature probe variant (175°C).

330130-90-05: Probe mounting bracket kit.

330180-51-00: Waterproof junction box for field connections.

Installation and Maintenance

Pre-installation preparation: Verify target material compatibility (ferromagnetic steel). Clean mounting hole with isopropyl alcohol. Use proper installation tools (3300 XL mounting kit) to achieve 1.0–1.5 mm (40–60 mils) initial gap. Route cable away from high-voltage sources (>200 mm separation). Torque connector to 7.5 N·m (66 lb-in).

Maintenance recommendations: Perform annual gap voltage checks (±0.5 VDC tolerance). Inspect probe tip for pitting/coating buildup quarterly. Test cable insulation resistance (>5 MΩ) during shutdowns. Replace if sensitivity drift exceeds 5%. Always pair replacement 135031-01 probes with matching proximitors to maintain calibration.