PROXPAC XL Proximity Transducer | 330881-BR-04-85-03-02 | Bently Nevada

Technical Specifications

The Bently Nevada 330881-BR-04-85-03-02 is the PROXPAC XL Proximity Transducer. It is used for non-contact monitoring of shaft vibration, axial displacement, and speed/key phase of critical rotating machinery, and is mainly used in steam turbines, compressors, large fans, etc.

Torque Tightening of Original Plugs: The PROXPAC XL has three cable outlets, two of which are unused and pre-installed with original explosion-proof plugs. Before on-site overhaul handover, these plugs must be fully tightened using an Allen wrench. If the plugs are loose, water will directly seep into the built-in 3300 XL preamplifier circuit during heavy rain.

Drip Loop Wiring: When the three-core shielded cable leading from the field passes through the M20 waterproof connector, it is strictly forbidden to pull it straight down into the cable tray. A circular sag with a radius of at least 50 mm must be left below the sensor.

85 mm depth for high-frequency response characteristics in dynamic signal transmission

Frequency response attenuation control: For medium-to-high-speed rotating machinery with speeds from 3,000 rpm to 12,000 rpm, this component can capture first harmonic (1X), second harmonic (2X), and high-frequency sub-synchronous oil film eddy signals of the shaft without attenuation.

Electromagnetic interference (EMI/RFI) immunity design: Due to the proximity of the built-in circuit board to the bearing housing, the conductive fiber PPS material used for the housing forms a natural Faraday cage. This effectively shields against radio frequency interference radiated from high-voltage motors or frequency converters (VFDs) in the field.

Technical FAQ

Q: In actual operation, what voltage range does the 2.0 mm linear measurement section of the 330881-BR-04-85-03-02 typically correspond to?
A: It corresponds to a static DC output voltage variation range between -2 Vdc and -18 Vdc.

Q: How does the 330881-BR-04-85-03-02 filter out misreading signals when there is slight magnetic inhomogeneity on the shaft surface due to machining?
A: This cannot be filtered out by physical hardware. This condition causes electrical fluctuations and must be compensated for using a 3500 system instrument.

Q: When installing the 330881-BR-04-85-03-02, how tightly should the Phillips head explosion-proof screws on the top cover be tightened?
A: It is recommended to keep the tightening torque of the top cover housing between 4.5 and 5.6 Nm to ensure uniform deformation of the internal sealing ring.

Q: What is the nominal output impedance of the dynamic signal output terminal of the 330881-BR-04-85-03-02 sensor?
A: The standard design resistance of the dynamic voltage signal output terminal of this sensor is 50 ohms.

Q: Are your products brand new?
A: Yes. We only supply 100% original and brand-new products. All items are sourced through authorized channels and have never been used or refurbished.

Q: Why can customers buy with confidence?
A: Because every product is backed by our 1-Year Warranty Guarantee of Quality, ensuring reliability, customer satisfaction, and long-term support after delivery.

Q: Do you provide international shipping?
A: Yes. We ship products to customers worldwide using reliable international logistics services such as EMS, DHL, UPS, and FedEx.

Trusted by 5,000+ plants worldwide |  Contact for more Bently Nevada spares: sales1@amikon.cn

You May Also Like: