General Information

Core Description

The 86691-00680-0350-90-05 is a Bently Nevada 3300 XL 11mm OEM-modified proximity probe featuring an extended 4.0 mm linear tracking range. Fully compatible with 11mm system backplanes, this specialized unit works seamlessly with 3300 XL 11mm Proximitor sensors to deliver highly stable thrust displacement tracking and reliable machine protection communication.

Specific Application

• Extended-Range Axial Position Tracking: Monitoring thrust bearing deflection on critical industrial machinery where standard 8mm sensors fall short of the required linear measurement window.
• Thick-Walled Machine Bore Deployment: Penetrating multi-jacketed compressor frames or deep steam turbine housings using an elongated 350mm mechanical case length.
• Direct-Connect Enclosure Routing: Eliminating intermediate field junctions by threading the integrated 9.0-meter (29.5 feet) triaxial cable straight from the target track to a remote instrument cabinet.

Ordering Information

System Compatibility

• Proximitor Sensor Pairing: Mates natively with the Bently Nevada 3300 XL 11mm Proximitor Sensor (e.g., 330780).
• System Interconnects: Integrates with 3300 XL 11mm Extension Cables if custom short-cable versions of the 86691 series are deployed.
• API Standard Alignment: Delivers backward operational data metrics that remain compliant with global API 670 instrumentation specifications.

Alternative Model & Differences

• Alternative Model: Standard 3300 XL 11mm Proximity Probe (Part Number 330701).
• Key Differences:

• Mechanical Hardware Customization: The 86691-00680-0350-90-05 is an OEM-modified part offering tailored non-standard mechanical body housing dimensions. The standard 330701 probe restricts catalog case metrics up to maximum limits of 250mm.
• Sleeve and Cable Integration: This custom 86691 part number locks in an extra-long 350mm physical case matched to a 9.0m single-piece integrated cable path. The standard catalog 330701 requires distinct extension line junctions to bridge comparable distances.

Installation & Troubleshooting FAQ

Q1: What is the correct initial calibration voltage required for this custom 11mm proximity system?

A: For the 3300 XL 11mm transducer architecture, the scale factor is calibrated to 3.94 V/mm (100 mV/mil). The correct physical midpoint initial calibration gap voltage is -10.0 VDC, mirroring the standard 8mm setup but spanning a wider 4.0 mm (160 mils) total linear field. Hook up a digital multimeter across the Proximitor sensor's OUT and COM lines, then thread the probe forward until it references -10.0 VDC before locking down the outer assembly.

Q2: Why is the transducer loop generating signal saturation or clipping at the upper end of its linear span?

A: This issue usually points to cross-talk or a severe side-effect constraint caused by tight machine spacing. Because the 11mm tip emits a significantly larger electromagnetic field than an 8mm probe, it is highly sensitive to surrounding metallic walls. Field engineers must ensure that any casing counterbore diameter is machined to at least three times the probe tip diameter to prevent physical signal dampening and calibration curve distortion.

Q3: How do I safeguard the integrated 9.0m triaxial cable connection against severe moisture ingress during washdowns?

A: Conductive fluids bridging the internal gold-plated ClickLoc connector terminal pins will instantly cause severe phase errors and data glitches. To permanently isolate the loop from rain or oil mist, always install original Bently Nevada silicone connector protectors over the terminal junction. Alternatively, wrap the layer tightly using self-fusing waterproof rubber tape covered by a protective shield of standard PVC electrical tape.