Bently Nevada 330881-28-04-070-03-02 PROXPAC XL Proximity Transducer

Description

The 330881-28-04-070-03-02 is a metric-configured integrated proximity transducer assembly in the Bently Nevada PROXPAC XL series. This configuration integrates a 3300 XL 8 mm proximity probe and a 3300 XL Proximitor sensor into a single, self-contained unit. It is configured with Option 28 (3300 XL 8 mm probe with Multiple Approvals), Option 04 (40 mm standoff adapter), Option 070 (70 mm probe penetration depth), Option 03 (one M20 conduit fitting and two plugs), and Option 02 (3/4-14 NPT process mounting thread).

By housing the proximity probe and the Proximitor sensor together, this system eliminates the need for an external extension cable and separate Proximitor junction boxes. The housing is molded from glass and conductive fiber-reinforced Polyphenylene Sulfide (PPS), an advanced thermoplastic engineered to dissipate electrostatic charges and resist corrosive elements. Certified to IP66 and Type 4X, this unit is designed to connect directly to machinery protection systems in harsh operating conditions, such as those found near gas turbines, steam turbines, pumps, and compressors.

Features

• Direct Field Connection: Eliminates intermediate extension cables and separate Proximitor housings by placing the sensor directly inside the protective assembly.
• Hazardous Area Certified (Option 28): Built-in probe meets global intrinsic safety and non-incendive standards via multiple approvals from CSA, ATEX, and IECEx.
• Metric Configuration (330881): Built with metric-specific options including a 40 mm standoff adapter and a 70 mm insertion depth for precise mechanical placement.
• Secure Terminal Access (Option 03): Equipped with one M20 conduit entry fitting and two blanking plugs to protect field terminal terminations.
• Threaded Mounting (Option 02): Features a 3/4-14 NPT mounting thread required to structurally secure the standoff adapter to the machine housing.
• Rugged Polymer Housing: Advanced PPS construction provides Type 4X and IP66 sealing against moisture, chemicals, and mechanical impact.

Applications

This integrated proximity transducer is used for machinery protection and diagnostic monitoring on rotating assets, including:

• Radial vibration and axial position measurements on steam turbines and gas turbines
• Shaft displacement and thrust monitoring on high-speed pumps and centrifugal compressors
• Non-contact displacement sensing in hazardous locations or high-humidity process areas

Ordering Information

Technical Specifications

Installation Guidelines

To ensure proper electrical operation and mechanical stability:

• Sensor Gapping: Set the initial physical gap between the probe tip and the target using a digital voltmeter. The recommended gap is 1.27 mm (50 mils), which corresponds to approximately -9.0 Vdc at the output terminal.
• Field Wiring Connection: Terminate field wiring directly on the terminal board inside the housing cover. Use 3-conductor shielded, twisted cable (16 AWG to 24 AWG or 0.2 to 1.5 mm2) for runs up to 305 meters (1000 feet) to the monitoring system.
• Environmental Sealing: Use appropriate thread sealant on the 3/4-14 NPT process mounting threads and M20 conduit fittings to maintain the IP66 rating and prevent oil or water intrusion into the housing.
• Grounding: Connect the internal grounding liner to plant ground to ensure adequate protection against electrostatic discharge and signal noise.

Compliance and Certifications

The integrated probe and Proximitor sensor assemblies are certified for hazardous locations under the following codes:

• ATEX / IECEx (Intrinsic Safety): Ex ia IIC T4/T5 Ga, Ex ia IIIC T90C/T105C Dc
• ATEX / IECEx (Non-Sparking / Increased Safety): Ex nA IIC T4/T5 Gc, Ex ec IIC T4/T5 Gc
• CSA / NRTLus: Class I, Zone 0: AEx/Ex ia IIC T4/T5 Ga; Class I, Groups A, B, C, D; Class II, Groups E, F, G; Class III; Class I, Division 2, Groups A, B, C, D
• CE Mark: Compliant with European electromagnetic compatibility and electrical safety directives