330104-01-05-05-02-CN Bently Nevada 3300 XL 8mm Proximity Probe

Product Overview

The 330104-01-05-05-02-CN is a specialized reverse-mount proximity probe within the world-renowned Bently Nevada 3300 XL 8mm series. This transducer is engineered for the high-demand environment of Turbine Supervisory Instrumentation (TSI), providing critical measurements of radial vibration, axial thrust, and speed. Unlike standard probes, the 330104 series is designed primarily for applications where the probe must be installed from the "inside out" or through specific reverse-mount housing assemblies.

Utilizing the eddy current principle, this 8mm probe delivers a non-contact solution for monitoring shaft displacement with sub-micron precision. It serves as an essential early-warning component for protecting high-value rotating assets—such as centrifugal pumps, compressors, and gas turbines—against catastrophic mechanical failure. Its 3300 XL architecture ensures superior temperature stability and a linear response that remains consistent across varying industrial climates.

Technical Configuration

The model code 330104-01-05-05-02-CN follows a precise logic that defines the mechanical footprint and regional compliance of the sensor.

Unthreaded Length (01)

The 01 option specifies a 10 mm unthreaded portion at the tip of the probe. This design helps prevent the probe threads from binding in thin-wall mounting brackets and allows for finer depth adjustment during the gapping process.

Overall Case Length (05)

The 05 designation indicates a 50 mm (approximately 2.0 inches) total case length. This compact body is ideal for tight-clearance bearing housings where internal space is at a premium.

Total Length (05)

This probe features a 0.5 meter (1.6 feet) total cable length. As a "stubby" probe, it is designed to connect immediately to a 3300 XL extension cable, keeping the high-frequency junction close to the machine casing for better protection.

Connector and Cable (02)

The unit utilizes a Miniature coaxial ClickLoc™ connector with standard cable. The ClickLoc™ system employs a gold-plated, positive-locking mechanism that eliminates the need for torque wrenches and prevents signal loss due to machine vibration.

Agency Approval (CN)

The CN suffix denotes that this specific unit is certified for use in China. It carries the necessary NEPSI/CCC-Ex approvals required for hazardous area installations, ensuring legal and technical compliance for projects within the region.

Technical Specifications

Engineering Advantages

The 330104-01-05-05-02-CN is built to withstand the "dirty" reality of industrial machinery.

• Fluid Resistance: The probe tip is molded from high-performance polyphenylene sulfide (PPS), making it impervious to water, steam, and synthetic turbine oils.

• Gold-Plated Reliability: Every ClickLoc™ connector features gold plating to prevent oxidation—a common cause of signal drift in vibration monitoring systems.

• Systemic Compatibility: This probe is fully compatible with both the 3300 and 3300 XL 5-meter and 9-meter extension cable systems, allowing for seamless integration into existing TSI racks.

Installation & Maintenance Guide

Proper gapping is the single most important factor in ensuring accurate vibration data.

Gap Voltage Calibration

Install the probe and monitor the DC voltage via the Proximitor® Sensor. For the 3300 XL 8mm system, a gap of -10.00 VDC typically places the probe at the physical center of its 80-mil linear range. Ensure the shaft is at its "normal" running position (cold vs. hot) when setting thrust probes.

Minimum Bend Radius

Do not bend the coaxial cable tighter than a 25.4 mm (1.0 inch) radius. Over-bending can damage the internal shielding, leading to "noise" that the monitoring system might interpret as actual shaft vibration.

Tightening Torque

When installing the probe into a threaded hole, ensure the jam nuts are secured to approximately 13.6 N·m (120 in·lb). Over-tightening can deform the probe case, while under-tightening leads to "probe chatter" and false alarms.

Technical FAQs

Q1: What is the difference between a 330101 and this 330104 model?

A1: The 330101 is a standard-mount probe (threads on the outside), while the 330104 is a reverse-mount probe. The 330104 is specifically designed for use in Bently Nevada's 3300 XL probe housings or when the probe must be installed from inside the machine.

Q2: Does the "05" (0.5m) total length include the extension cable?

A2: No, the 0.5m length refers only to the "pigtail" cable permanently attached to the probe head. To create a functioning system, you must connect this to a 3300 XL extension cable to reach a total system length of either 5.0m or 9.0m.

Q3: Is this probe compatible with non-Bently Nevada monitors?

A3: This probe outputs a raw signal that must be conditioned by a Bently Nevada Proximitor® Sensor. Once conditioned to the standard 200 mV/mil signal, it can be read by any PLC or DCS system with a -24V power supply and 4-20mA or raw voltage input.

Q4: Can the "CN" version be used outside of China?

A4: Technically, yes. The "CN" version meets the same physical and electrical standards as the "00" version, but it includes additional regional certification markings. It is primarily used to ensure compliance with Chinese industrial safety laws.