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Brand: Bently Nevada
Bently Nevada 3300 XL 25 mm Proximitor Sensor 330850-51-CN
Description
Overview
The Bently Nevada 330850-51-CN is a 3300 XL 25 mm Proximitor Sensor. Although listed on this page as a proximity probe, the 330850 part number is the Proximitor (signal conditioner) of the 3300 XL 25 mm Proximity Transducer System, which consists of a separate 25 mm probe, an extension cable and this Proximitor. The system provides a 0.787 V/mm (20 mV/mil) output over a 12.7 mm (500 mil) linear range.
Because of this long linear range, Bently Nevada positions the 3300 XL 25 mm system for differential expansion (DE) measurement on mid-size to large steam turbine generators, where the rotor and casing grow at different rates. In the 330850-AA-BB order code, option 51 specifies a 5.0 m system length with DIN mounting. The -CN suffix is not listed in the approval options (00 and 05) of datasheet 163236 Rev. M; distributors describe it as a country-specific approval variant, so it should be confirmed against the nameplate of the unit being replaced.
Key Features
- Proximitor Sensor for the 3300 XL 25 mm transducer system (probe and extension cable ordered separately)
- 12.7 mm (500 mil) linear range at 0.787 V/mm (20 mV/mil)
- Designed for differential expansion measurement on large steam turbines
- Thin housing for high-density DIN-rail installation (51 option)
- Up to 305 m of field wiring to the monitor
- Operating range -51 °C to +100 °C
Technical Specifications
| Parameter | Value |
|---|---|
| Part number | 330850-51-CN |
| Product | 3300 XL 25 mm Proximitor Sensor |
| Total length and mounting option | 51: 5.0 m system length, DIN mount |
| Input | One 3300 XL 25 mm proximity probe and extension cable |
| Power | -17.5 to -26 Vdc without barriers at 12 mA max; -23 to -26 Vdc with barriers |
| Output resistance | 50 Ω |
| Linear range | 12.7 mm (500 mils), approx. 0.63 to 13.33 mm from target, approx. -1.5 to -11.5 Vdc |
| Average scale factor | 0.787 V/mm (20 mV/mil) nominal |
| Deviation from best-fit straight line | <±0.31 mm (±12 mils) |
| Frequency response | 0 to 2.7 kHz, +0/-3 dB typical, with up to 305 m field wiring |
| Recommended minimum target | 61 mm (2.4 in) diameter, flat |
| Proximitor material | A380 aluminium |
| Operating temperature | -51 °C to +100 °C |
| Storage temperature | -51 °C to +105 °C |
| Supply sensitivity | Less than 2 mV output change per volt of supply change |
| Proximitor sensor mass | 255 g (9 oz) |
| Field wiring size | 0.2 to 1.5 mm² (16 to 24 AWG); 3-conductor shielded triad recommended |
| Reference gap for specifications | 7.0 mm (275 mils), AISI 4140 target, -24 Vdc supply, 10 kΩ load |
| System length options | 5 or 9 metres including extension cable |
| Extension cable capacitance | 69.9 pF/m (21.3 pF/ft) typical |
| Connector torque | Finger tight recommended; 0.565 N.m (5 in.lb) maximum |
| Minimum cable bend radius | 25.4 mm (1.0 in), with or without armor |
| Relative humidity | 100% condensing, non-submersible when connectors are protected |
Applications
- Differential expansion (rotor versus casing growth) on steam turbine generators in power and desalination plants
- Two-transducer collar or ramp DE arrangements feeding a 3500/45 Position Monitor
- Replacement of existing 330850 Proximitors in installed 3300 XL 25 mm loops
330850-51-CN Part Number Breakdown
The 3300 XL 25 mm Proximitor Sensor is ordered as 330850-AA-BB. Field A combines system length and mounting style, and only four values are published: 50 (5.0 metres, panel mount), 51 (5.0 metres, DIN mount), 90 (9.0 metres, panel mount) and 91 (9.0 metres, DIN mount). In 330850-51-CN the 51 therefore identifies a unit calibrated for a 5.0 metre (16.4 ft) electrical length and supplied for 35 mm DIN-rail installation. A 5 metre sensor must not be used with a 9 metre probe and cable combination, or the reverse.
Field B is the agency approval option. The published ordering table lists two values only: 00 (No Approvals) and 05 (Multiple Approvals). The suffix CN does not appear in that table, so its exact scope cannot be confirmed from the published ordering information. Bently Nevada points to its Approvals Quick Reference Guide (document 108M1756) for country-specific and product-specific approval listings. Before installing this unit in a classified area, confirm the certificate marked on the sensor label against that guide and the site requirements rather than assuming it is equivalent to the 05 option.
Matching 25 mm Probe, Extension Cable and Mounting Hardware
The sensor accepts one 3300 XL 25 mm probe (330851) and one 3300 XL 25 mm extension cable (330854). Probe lead length plus extension cable length must equal the system length of the sensor. Probes are offered in 1.0, 5.0 and 9.0 metre leads and the 330854 cable in 4.0 metre (040) and 8.0 metre (080) lengths, with a high temperature FluidLoc cable option and an armored version. A 5 metre probe is intended for the 5 metre sensor only. When upgrading 7200 25 mm, 7200 35 mm or 25 mm DE Integral systems, probe, cable and sensor must all be replaced.
Probe case choices under 330851 are 1 1/4-12, M30x2, 1.06 in smooth (rear or side exit), 1 1/2-12, M39x1.5 and 1.5 in smooth (rear or side exit). Threaded cases are tightened to 68 N.m (50 ft.lb) recommended, 163 N.m (120 ft.lb) maximum. For gap verification the 330853 sliding bracket is available in a short version (±25.4 mm travel) and a long version (±76.2 mm travel). Replacement mounting pads are 138493-01 (DIN) and 138492-01 (panel); test plug 148722-01 fits the terminal strip test holes.
Why Seven Star LLC
Seven Star LLC supplies Bently Nevada (Baker Hughes) 3300 XL transducer components to power, oil & gas, petrochemical and water customers across Oman and the GCC. Before quoting, we check the complete part number and the system length, mounting style and approval suffix against the equipment already installed, so the replacement matches the existing system.
330850-51-CN Proximitor FAQ
What is the Bently Nevada 330850-51-CN?
It is the Proximitor (signal conditioner) for the 3300 XL 25 mm Proximity Transducer System. The 25 mm probe and extension cable are ordered separately.
What is the linear range and scale factor?
A 12.7 mm (500 mil) linear range with an average scale factor of 0.787 V/mm (20 mV/mil), used mainly for differential expansion measurement on large steam turbine generators.
What does option 51 mean in the 330850 order code?
Option 51 specifies a 5.0 m system length with DIN mounting. The -CN suffix is not defined in the published ordering table, which lists only 00 (no approvals) and 05 (multiple approvals), so it should be confirmed against the nameplate of the unit being replaced.
What power and temperature ratings apply?
Power is -17.5 to -26 Vdc without barriers at 12 mA max, and operating temperature is -51 °C to +100 °C, with up to 305 m of field wiring to the monitor.
Which monitor does it feed?
In two-transducer differential expansion arrangements it feeds a 3500/45 Position Monitor.
Request a Quote for Bently Nevada 330850-51-CN 3300 XL 25 mm Proximitor Sensor
Submit a formal inquiry through our RFQ page with the part number 330850-51-CN, the quantity, the installed 25 mm probe and extension cable part numbers and whether the -CN approval variant is required. We will confirm the correct configuration and respond with a formal quotation. | Inquiry Form
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Also available: Bently Nevada 3500/50M Tachometer Module
Other Models in the Bently Nevada 3300 XL Proximity Transducer System Range
Seven Star LLC supplies models from the Bently Nevada 3300 XL Proximity Transducer System range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Bently Nevada 3300 XL 8mm Proximity Transducer System | Vibration Monitoring | View details |
| Bently Nevada 3300 XL 8mm Probe 330103-00-05-10-01-00 | Vibration Monitoring | View details |
| Bently Nevada 3300 XL 8mm Proximity Probe – 330101-00-27-10-02-05 | Vibration Monitoring | View details |
| Bently Nevada 3300 XL Probe 330101-00-27-50-02-05 | Vibration Monitoring | View details |
| Bently Nevada 3300 5mm Proximity Probe – 330170-00-08-20-02-05 | Vibration Monitoring | View details |
| Bently Nevada 3300 XL 25 mm Proximitor Sensor 330850-51-CN | Vibration Monitoring | You are viewing this model |
| Bently Nevada 3300 XL Proximitor Sensor 330180-X0-05 | Vibration Monitoring | View details |
| Bently Nevada 3300 XL Proximitor Sensor 330180-12-00 | Vibration Monitoring | View details |
| Bently Nevada 3300 XL Proximitor 330180-50-05 | Vibration Monitoring | View details |
| Bently Nevada 3300 XL Proximitor 330180-51-CN | Vibration Monitoring | View details |
Datasheets & Documents
- Datasheet Bently Nevada 3300 XL Proximity Probe 330850-51-CN Datasheet Download
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About brand
Since 1961 Bently Nevada, of Minden, Nevada, USA, has been closely tied to two things: the eddy current proximity probe and the rack-based machinery protection system. The 3500 rack is found on turbines and compressors in most large process plants.
Seven Star LLC is an independent supplier of Bently Nevada 3500 monitor modules, interface and communication modules, proximity probes, accelerometers and velocity transducers for operators in Oman and the GCC, with every item matched to the full part number.
Bently Nevada 3500 modules and transducers
The listed 3500 modules include the 3500/20 Rack Interface Module, the 3500/50M Tachometer, the 3500/61 Temperature and 3500/62 Process Variable monitors, the 3500/64M Dynamic Pressure monitor, the 3500/44M for aeroderivative gas turbines and the 3500/46M Hydro monitor. Reciprocating compressor monitoring is covered by the 3500/70M, 3500/72M and 3500/77M. The 3500/92 Communication Gateway and 3500/94M display link the rack to the control system. Transducers include the 3300 XL proximity probe system, the 330400 accelerometer and the 190501 Velomitor CT velocity transducer. The manufacturer's newer platform, Orbit 60, is offered as the modernization path for 3500 racks, and System 1 software handles diagnostics.
Where Bently Nevada vibration monitoring is used
Steam and gas turbines, generators, centrifugal and reciprocating compressors, large pumps, hydro units and cooling tower fans in oil and gas, power generation, petrochemical and mining plants are the usual machines. Measurements include radial vibration, thrust position, speed, phase, differential expansion, bearing temperature, rod position and cylinder pressure.
Ordering Bently Nevada parts: what we need
Send the complete part number with every option field, for example 330103-00-05-10-01-00 for a probe or the 3500 module number with its option dashes, plus the matching I/O module number. For probe systems state probe series, system length and the hazardous area approval. A photo of the label avoids transcription errors, and for rack modules the firmware revision is useful.
Browse Bently Nevada products by category: Vibration.
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Frequently Asked Questions
What is the 330850-51-CN proximity probe?
It is the Proximitor (signal conditioner) of the 3300 XL 25 mm Proximity Transducer System. The 25 mm probe and extension cable are ordered separately.
Is the 330850-51-CN compatible with the 3300 XL Proximitor?
It is itself a Proximitor and works with 3300 XL 25 mm probes (330851) and extension cables (330854), with an average scale factor of 0.787 V/mm (20 mV/mil).
Where are these probes manufactured?
The manufacturing location is not stated in the 3300 XL 25 mm datasheet and can be confirmed at quotation.
What does the -CN suffix on the part number mean?
The datasheet ordering table lists only 00 (no approvals) and 05 (multiple approvals) for the approval option, so the CN suffix should be confirmed against the unit nameplate.
How is the probe matched with the rest of the system?
The probe, extension cable and Proximitor are ordered so their lengths add up to the system length configured for the machine.
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