Description

Configured for transmitting high-frequency eddy-current signals in 3500 Machinery Protection Systems, the Bently Nevada 330130-040-00-05 (330130 Extension Cable) provides direct physical/electrical execution. This component connects an 8 mm proximity probe to a compatible proximitor sensor, maintaining impedance matching across the entire circuit path. The assembly provides mechanical protection and electrical shielding against industrial electromagnetic interference without altering signal propagation delay. Consequently, the hardware passes raw voltage variations to monitoring modules to evaluate machinery health.

Suffix Breakdown & Model Matrix

The alphanumeric suffixes designate specific physical characteristics and compliance metrics for this hardware assembly:

• 330130: Base model number for the 3300 XL 8 mm Proximity Transducer Extension Cable.
• -040: Specifies a total physical cable length of 4.0 meters (13.1 feet).
• -00: Indicates standard cable construction without a connector protector.
• -05: Denotes multiple hazardous area agency approvals, including ATEX, IECEx, and CSA certifications.

Hardware Specifications

Eddy-Current Probe Scaling and Gap Voltage Validation

The hardware executes a linear voltage response relative to the physical distance between the probe tip and the observed target area. During initial installation and routine calibration, field engineers perform gap voltage validation to establish the physical center of the linear range. Adjusting the probe position until the proximitor sensor output measures a steady -10 VDC targets the midpoint of the 80 mil (2.0 mm) linear range.

Because the system relies on eddy-current probe scaling calibrated at 7.87 V/mm (200 mV/mil), any mismatch in total system length alters the overall capacitance and electrical length. This mismatch directly corrupts the voltage output curve, inducing false readings in rotor dynamics analysis. Therefore, maintaining the specified 4.0-meter length variant guarantees proper cross-talk suppression and signal integrity within high-density instrument trays.

Frequently Asked Questions

Q: Can this 4.0-meter extension cable be paired with any length of proximity probe?

A: No, the total electrical length of the proximity probe plus the extension cable must match the required input length of the proximitor sensor, which is strictly 5.0 meters or 9.0 meters. Pairing this 4.0-meter cable with a 1.0-meter probe creates a proper 5.0-meter system, whereas pairing it with an incorrect probe length disrupts the system calibration.

Q: Is hot-swapping this extension cable permissible while the machinery protection system is fully energized?

A: Yes, the cable is a passive components and can be disconnected or reconnected while the system is powered. However, disconnecting the cable will open the sensor loop, which causes the associated monitor channel to drive to a “Not OK” state and potentially trigger a downstream trip if bypasses are not active.

Field Installation Guidelines

• Connector Torque and Insulation: Connect the coaxial interfaces by hand until the internal ClickLoc mechanism engages. Do not use pliers or locking wrenches, as excessive torque will deform the gold-plated pins. Slide the standard clear fluoropolymer sleeve over the connection to insulate the outer ring from machine ground.
• Conduit and Cable Routing: Route the cable body inside dedicated flexible or rigid metal conduits to shield against physical impact and external electromagnetic noise. Avoid routing this low-voltage sensor cable parallel to high-voltage AC motor lines or variable frequency drive outputs.
• Bend Radius Limits: Maintain a minimum bend radius of 25.4 mm during installation. Sharp kinks or tight zip-ties crush the internal dielectric layer, altering the 75-ohm characteristic impedance and generating signal reflections that degrade vibration accuracy.