Bently Nevada 330851-06-000-070-50-00-05 3300 XL 25 mm Proximity Probe

Description

Option 06 (M39x1.5 metric thread), Option 000 (0 mm unthreaded length), and Option 070 (70 mm overall case length) specify this 3300 XL 25 mm probe configuration — 330851-06-000-070-50-00-05. This unarmored, 5.0 m system length configuration (Option 50, Option 00) provides non-contact displacement measurements for steam turbine differential expansion (DE) and axial position monitoring in industrial environments requiring multiple hazardous area approvals (Option 05).

As part of the 3300 XL 25 mm proximity transducer system, this probe operates in conjunction with a 3300 XL 25 mm Proximitor sensor and a compatible extension cable. The complete system outputs a nominal scale factor of 0.787 V/mm (20 mV/mil) over a 12.7 mm (500 mils) linear range. It is designed to physically replace standard 7200 25 mm and 35 mm systems without requiring changes to monitor configurations, utilizing a dual front-and-rear sealing mechanism combined with FluidLoc triaxial coaxial cable to block moisture ingress along the probe lead.

Features

• Option 06 Thread Type: M39x1.5 metric threaded AISI 304 stainless steel case.
• Option 000 Unthreaded Case: Fully threaded design with 0 mm unthreaded length for flush or deep-well mount installations.
• Option 070 Case Length: 70 mm overall case length providing stable mechanical installation depth.
• Option 50 Total Length: 5.0 metres (16.4 feet) total probe length, designed for 5.0 m system configurations.
• Option 00 Mechanical Protection: Unarmored 75 ohm triaxial FluidLoc coaxial cable with a standard perfluoroalkoxyethylene (PFA) jacket.
• Option 05 Approvals: Certified for multiple global hazardous area safety regulations (ATEX, IECEx, and CSA).
• Linear Range: 12.7 mm (500 mils) beginning at approximately 0.63 mm (25 mils) from the target face.
• Average Scale Factor: 0.787 V/mm (20 mV/mil) nominal output sensitivity.
• High-Temperature Resistance: Continuous operation from -35 degC to +200 degC (-31 degF to +392 degF), with short-term resistance up to +250 degC (+482 degF).

Applications

• Steam turbine generator differential expansion (DE) monitoring
• Rotor axial casing expansion and relative casing growth measurements
• Large shaft axial thrust position tracking
• Rod drop monitoring in large reciprocating compressors
• Industrial machinery protection in hazardous locations (Option 05 CSA/ATEX/IECEx environments)

Ordering Information

Technical Specifications

Installation Guidelines

Ensure correct mechanical installation and probe clearance to prevent damage during machinery operation. Ground the probe shield correctly and maintain the minimum bend radius of the coaxial FluidLoc cable. Utilize appropriate wrench sizes for the M39x1.5 thread and respect the torque specifications (maximum rated torque of 163 N-m). For hazardous area installations, install the probe system according to Bently Nevada drawing 141092 (intrinsically safe) or drawing 140979 (non-incendive/non-sparking) as dictated by local certifications.

Compliance and Certifications

The 3300 XL proximity probe system complies with major international safety standards for industrial monitoring applications. Certified hazardous area options under Option 05 include ATEX and IECEx intrinsically safe (Ex ia IIC Ga) and non-sparking/non-incendive (Ex nA/Ex ec IIC Gc) approvals. It also complies with the European CE marking guidelines.