330877-040-37-00 Bently Nevada Armored Probe Cable

Product Overview

The 330877-040-37-00 is an authentic, industrial-grade 3300 XL 50 mm Extension Cable with Armor engineered by Bently Nevada (a Baker Hughes business). This heavy-duty component is designed for high-precision proximity transducer systems, which are widely deployed across heavy industries to monitor shaft vibration, axial position, and oil-film bearing clearances in large rotating machinery. Featuring a flexible stainless steel armor casing over a specialized FluidLoc triaxial line, this 4.0-meter cable provides superior physical protection while transmitting sensitive eddy-current signals from a 50 mm probe to a remote Proximitor sensor. Safely preserved in its original factory packaging, this brand-new assembly carries a full 12-month factory warranty and has a total shipping weight of approximately 1.45 lbs (approx. 0.66 kg) due to its robust metal armoring layer.

The visual showcases the flexible, interlocking stainless steel armor sheath that encases the core signal line. The exposed light-blue ends feature high-quality miniature coaxial connectors, allowing the cable to bend seamlessly into junction boxes while keeping the core protected from heavy impact and crushing forces.

Core Technical Advantages

• Rugged Interlocking Metal Armor (Option 37): Wrapped in a highly durable, flexible stainless steel armor conduit. This protective layer shields the inner PFA insulated cable from crushing forces, sharp metal shavings, worker foot traffic, and aggressive mechanical abrasion common on turbine decks.
• FluidLoc Wicking Barrier: Incorporates a proprietary internal block design that prevents lubricating oils, process moisture, or corrosive chemicals from traveling down the inside of the cable jacket into sensitive electronic enclosures if the cable ends are exposed.
• Premium Triaxial Noise Isolation: Engineered with a 75 Ω triaxial architecture insulated with high-temperature Perfluoroalkoxyethylene (PFA). This multi-layered shield provides extreme immunity against electromagnetic interference (EMI) and cross-talk caused by nearby high-voltage machine wiring.
• Broad Operating Temperature Range: Rated to perform reliably without signal degradation in extreme environmental temperatures ranging from -51°C up to +200°C (-31°F to +392°F), handling everything from freezing ambient shutdowns to hot steam piping exposure.

Technical Specifications

Model Number Breakdown

The specific model code 330877-040-37-00 breaks down into the following design configuration values:

• 330877: Main product type prefix for the high-end 3300 XL 50 mm Extension Cable lineup.
• 040: Defines a standard physical cable length of exactly 4.0 meters (13.1 feet).
• 37: Configures the assembly with a **FluidLoc extension cable paired with protective metal armor**, providing heavy-duty structural reinforcement.
• 00: Designates **No Approvals**, intended for use in safe, non-hazardous areas where explosion-proof certifications are not regulatory requirements.

Installation & Field Maintenance Guidelines

• Strict 5.0m / 9.0m Loop Balancing Rule: To maintain correct eddy-current system calibration, the combined electrical length of your proximity probe and extension cable must perfectly match the configured length of the Proximitor Sensor. Because this part is a 4.0-meter line, it must be paired with a 1.0-meter proximity probe to achieve a standard 5.0-meter loop system. Mismatched lengths will disrupt the internal circuit impedance, introducing severe linearity errors in your vibration data.
• Connector Care and Protective Sleeves: Use a dedicated connector wrench tool during mating to ensure a snug fit without over-torquing. Since the miniature coaxial connectors are sensitive to mechanical stress, avoid twisting the wires. Even though option 37 features tough steel armor, the actual connection joint remains vulnerable to dirt and moisture; Bently Nevada strongly advises wrapping the final mated junction in self-fusing silicone tape or using an external connector protector.
• Armor Minimum Bend Radius Limits: Avoid creating sharp kinks when routing the armored cable through tight spaces. Bending the stainless steel conduit past its recommended minimum bend radius can pinch the internal PFA insulation. This distortion changes the 75 Ω line impedance, resulting in signal reflection ripples that show up as false vibration spikes on your machinery protection monitor.

Technical FAQs

Q1: What is the main benefit of option "37" armor compared to unarmored option "36"?
A1: Option 36 relies entirely on the bare PFA jacket, which is ideal for routing through smooth, pre-installed conduit pipes. Option 37 introduces an integrated, interlocking stainless steel armor sleeve over that same jacket, making it suitable for direct exposed routing across machinery frames where it might be stepped on or struck by falling tools.

Q2: Why does the specified cable DC resistance matter during plant maintenance?
A2: Proximity sensors rely on precise electrical properties to calculate distances accurately. During routine loop verification or troubleshooting for a "Sensor Drive Limit" fault, engineers use a multimeter to measure the loop resistances. Values outside the factory ranges (1.0 ± 0.25 Ω center-to-coax and 0.3 ± 0.1 Ω coax-to-coax) immediately signal a damaged cable, a loose connector, or internal wire degradation.

Q3: Can the "-00" option cable be installed in areas requiring intrinsic safety certifications?
A3: No. The "-00" option means the cable does not carry hazardous area markings. If your application is located within an explosive zone (such as a gas turbine enclosure or a hazardous chemical refinery skid), you must deploy an option that carries appropriate multi-agency certifications, such as the "-05" Multiple Approvals option.