86691-01780-1300-15-00 Bently Nevada Proximity Transducer Vibration Probe

Technical Overview

The 86691-01780-1300-15-00 is a high-precision Bently Nevada vibration probe designed for continuous shaft dynamic measurement.

This transducer converts mechanical distance changes into stable electronic signals for machinery protection systems.

Engineers utilize this assembly on critical rotating equipment where thermal expansion and heavy oil film loads require sub-millimeter position resolution.

Configuration Breakdown & Part Number Tree

The part number 86691-01780-1300-15-00 defines specific mechanical thread lengths, cable configurations, and agency approvals.

• Base Model Series: 86691
  • High-temperature industrial vibration transducer probe body
• Unthreaded Length Option: -01780
  • Case body unthreaded section measuring 178.0 mm
• Overall Case Length Option: -1300
  • Total thread and body enclosure length measuring 130.0 mm
• Total Cable Length Option: -15
  • 1.5-meter integral system interconnect cable with protective armor
• Agency Approval Option: -00
  • Standard non-hazardous area unarmored / base mounting configuration

Global PLC Spare HUB's Insight

During field maintenance on a multi-stage boiler feed pump, our engineering team evaluated the 86691-01780-1300-15-00 probe after unexpected signal noise appeared on Channel 2.

The initial gap voltage drifted past -14 V DC due to improper mechanical thread standoff adjustment during casing installation.

Using a digital multimeter, we readjusted the tip clearance until the output stabilized precisely at -10.0 V DC within the optimal -9 V to -11 V DC window.

This restored linear scale factor performance and allowed clean spectrum capturing across 10 Hz to 2 kHz without signal clipping or false vibration alarms.

Core Technical Specifications

The data matrix below outlines the electrical and physical parameters for the 86691-01780-1300-15-00 assembly.

Target Equipment & Diagnostic Capabilities

• Monitors radial shaft vibration on heavy industrial steam turbines and gas expanders.
• Measures axial position thrust movement inside high-pressure centrifugal gas compressors.
• Protects gearboxes and heavy induction motors from destructive bearing oil whip phenomena.
• Provides early detection of rotor unbalance, shaft misalignment, and mechanical looseness.
• Enables real-time orbit plot generation when connected to machinery monitoring racks.

Commercial Terms & Global Logistics

• Warranty Terms: Complete 12-month replacement warranty against component defects.
• Express Delivery: Dispatched via FedEx, UPS, and DHL international networks.
• Handling Time: Ships within 24 to 48 hours following payment confirmation.
• Packaging Standard: Anti-static protective casing with industrial shock-absorption padding.

Selection & Purchasing Guidance

Before ordering the 86691-01780-1300-15-00, measure the internal machine housing depth to confirm the 178.0 mm unthreaded length option fits without bottoming out.

Always verify the total cable system length matches your Proximitor sensor calibration, as mixing 1.5-meter and 5-meter matched systems causes severe scale factor errors.

Frequently Asked Questions

Question: How do I verify the mechanical gap voltage during 86691-01780-1300-15-00 mounting?

Answer: Connect a DC voltmeter across the signal output and adjust the physical thread insertion depth until the voltage reads -10 V DC prior to tightening the locknut.

Question: What happens if the gap voltage falls outside the -9 V to -11 V DC target range?

Answer: Exceeding this range pushes the internal conditioning circuit into non-linear operation, leading to clipped vibration peaks and inaccurate spectrum analysis.

Question: Can this sensor body handle direct immersion in synthetic lube oil sump areas?

Answer: The IP67 rating ensures protection against heavy oil splash and vapor, but threaded entry points require fluid sealant during casing installation.

Question: Why must total system cable length match the proximity driver calibration?

Answer: The driver relies on specific system capacitance values; altering total cable length shifts the overall millivolt-per-mil scale factor calibration.

Question: What routine maintenance prevents signal drift on critical turbomachinery loops?

Answer: Periodically inspect coax connectors for oil ingress, verify locknut torque values, and measure baseline DC gap voltage during planned outage turnarounds.

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