84661-20 | Bently Nevada Velomitor Interconnect Cable (20 ft / 6.1 m)

Product Overview

The Bently Nevada 84661-20 is a Velomitor Interconnect Cable designed for connecting Bently Nevada vibration transducers (such as Velomitor piezo-velocity sensors and proximity probes) to monitoring systems and junction boxes. This 20-foot (6.1 meter) cable features 22 AWG two-conductor twisted shielded construction with a flexible metal armor sleeve for mechanical protection. The moisture-resistant 2-socket female connector at one end and insulated terminal lugs at the other provide reliable, tool-free connections in harsh industrial environments.

Key Specifications

• Manufacturer: Bently Nevada (Baker Hughes)
• Product Family: 3300 XL / Velomitor Interconnect Cable
• Type: Interconnect Cable / Sensor Lead Cable
• Part Number: 84661-20
• Cable Length: 20 ft (6.1 m)
• Conductors: Two-conductor twisted, shielded 22 AWG
• Conductor Material: Tinned copper
• Protection: Flexible metal armor sleeve
• Connector A: 2-socket moisture-resistant female connector
• Connector B: Insulated terminal lugs
• Voltage Rating: 300 V
• Shielding Type: Foil shielded (with drain wire)
• Jacket Material: PVC
• Operating Temperature Range: -40°C to +85°C (-40°F to +185°F)
• Protection Rating: IP67 (moisture-resistant connector)
• Dimensions: 2 × 18.7 × 12.8 cm (0.79 × 7.36 × 5.04 in) — packaging
• Weight: 0.14 kg (0.31 lbs)
• Compatibility: Bently Nevada 3300/3500 monitoring systems, Velomitor sensors, 3300 XL proximity probes
• Not For Use With: 21128 Velocity Transducer Housing

Features & Benefits

• Integrated Armor Protection: The flexible metal armor sleeve eliminates the need for additional conduit, reducing installation time and material costs.
• EMI/RFI Shielding: Shielded twisted-pair construction prevents electromagnetic and radio-frequency interference from corrupting sensitive vibration signals.
• Moisture-Resistant Connector: The 2-socket female connector features a moisture-resistant seal that protects against oil and humidity ingress at the sensor connection point.
• Standard 20-Foot Length: The 6.1 meter length is the industrial standard for connecting local sensors to machine-mounted junction boxes.
• Wide Temperature Range: Operates reliably from -40°C to +85°C for outdoor and harsh environment installations.
• Tool-Free Connection: The moisture-resistant connector and terminal lugs enable quick, secure field installation without specialized tools.

Typical Applications

• Connecting Velomitor piezo-velocity sensors to monitoring systems
• Proximity probe extension in 3300 XL transducer systems
• Bearing housing vibration sensor cabling
• Motor and pump vibration monitoring installations
• Oil & gas compressor sensor connections
• Power plant turbine vibration cabling

Installation Guide

1. Cable Routing: Route the 84661-20 cable from the sensor mounting location to the monitoring system or junction box. Maintain minimum 300 mm separation from high-voltage AC power cables and motor drive cables to minimize inductive noise coupling.
2. Bend Radius: Avoid tight bend radii that could kink the armor. Maintain a bend radius of at least 10× the cable diameter to prevent mechanical damage and signal degradation.
3. Sensor Connection: Connect the 2-socket moisture-resistant female connector to the sensor's male connector. Hand-tighten until the seal is properly seated. Do not overtighten.
4. Terminal Connection: Connect the insulated terminal lugs to the monitoring system input terminals or junction box. Ensure proper polarity and torque per the monitoring system installation manual.
5. Shield Grounding: Ground the cable shield at the monitoring system end only. Connect the shield drain wire to the designated ground terminal. Do not ground at both ends to avoid ground loops.
6. Armor Grounding: Ground the flexible metal armor to the monitor rack or junction box common. Ensure the armor ground does not create a ground loop with the internal shield drain wire.
7. Strain Relief: Use cable clamps or strain relief fittings near the connector and terminal ends to prevent mechanical stress on the connections.
8. Verification: After installation, verify signal integrity by measuring the DC bias voltage at the monitoring system terminals. Stable readings indicate proper connection and shield grounding.

FAQ

Q: What sensors are compatible with the 84661-20?
A: The 84661-20 is compatible with Bently Nevada Velomitor piezo-velocity sensors, 3300 XL proximity probes, and other 2-pin transducer headers. It is not compatible with the 21128 Velocity Transducer Housing.

Q: Can I cut the 84661-20 to a shorter length?
A: No. The terminal lugs and armored transition are factory-terminated. Cutting the cable will compromise the shield integrity and moisture resistance. For shorter lengths, order the appropriate pre-terminated cable (e.g., 84661-03 for 3 ft, 84661-06 for 6 ft).

Q: What is the maximum cable length available?
A: The 84661 series is available in lengths from 3 ft (0.9 m) to 96 ft (29 m). Standard lengths include 6, 8, 10, 12, 15, 17, 20, 25, 30, 33, 50, and 99 ft. For the 84661-20, the maximum recommended length with HTVS is 305 meters (1000 ft).

Q: Does the armor need to be grounded?
A: Yes. The armor should be grounded to the monitor rack or junction box common. However, ensure it does not create a ground loop with the internal shield drain wire. Ground the shield and armor at the same point (monitoring system end).

Q: What is the difference between 84661-20 and 9571-series cables?
A: The 84661 series features integrated armor and moisture-resistant connectors. The 9571 series may have different connector types or armor configurations. Verify compatibility with your specific sensor and monitoring system before ordering.

Selection Tips

• Measure the exact cable run distance from sensor to monitoring system. Add 20% margin for routing. Order the closest standard length (e.g., 84661-20 for ~6 meter runs).
• Verify sensor connector compatibility. The 84661-20 uses a 2-socket moisture-resistant female connector designed for standard Bently Nevada 2-pin transducer headers.
• For hazardous area installations, verify the cable meets local hazardous area requirements or use additional conduit protection.
• When replacing a damaged cable, match the exact part number (84661-20) to ensure identical length, connector type, and armor configuration.
• Keep spare cables in inventory for quick replacement — damaged sensor cables are a common cause of monitoring system downtime.