Brand: Bently Nevada

Bently Nevada 330780-91-05 3300 XL 11 mm Proximitor, 9 m DIN

Name: Bently Nevada 330780-91-05 3300 XL 11 mm Proximitor, 9 m DIN
Brand: Bently Nevada
SKU: 330780-91-05

Description

330780-91-05: 3300 XL 11 mm Proximitor Sensor, 9.0 m DIN mount, multiple approvals

The Bently Nevada 330780-91-05 is the 3300 XL 11 mm Proximitor Sensor in a 9.0 m (29.5 ft), DIN-mount build with the multiple approvals option. It is the version to specify when the installation documents call for the hazardous-area approvals listed in the datasheet rather than a plain no-approval unit.

Decoded from 330780-AA-BB, 91 means 9.0 m system length with DIN mount, and 05 means multiple approvals.

Segment	Code	Meaning (from the ordering table)
330780	330780	3300 XL 11 mm Proximitor Sensor
A: total length and mounting	91	9.0 m system length, DIN-rail mount
B: agency approval	05	Multiple approvals

330780-91-05 technical specifications

Parameter	Specification
Manufacturer / part number	Bently Nevada 330780-91-05
Product	3300 XL 11 mm Proximitor Sensor
System length / mounting	9.0 m (29.5 ft) including extension cable; DIN-rail mount
Agency approval option	05 (multiple approvals)
Probe input	One non-contacting 3300 XL 11 mm probe with extension cable
Supply voltage	-17.5 to -26 Vdc at 12 mA maximum without barriers; -23 to -26 Vdc with barriers
Supply sensitivity	Less than 2 mV output change per volt of supply change
Output resistance	50 Ω
Linear range	4.0 mm (160 mils), from about 0.5 to 4.5 mm (20 to 180 mils), roughly -1 to -17 Vdc
Extended linear range	About 0.5 to 5.0 mm (20 to 200 mils), -1 to -19 Vdc; not applicable with zener barriers
Recommended gap	2.5 mm (100 mils)
Incremental scale factor	3.94 V/mm (100 mV/mil) ±10% including interchangeability error, in 0.5 mm (20 mil) steps over the 4.0 mm range
Deviation from best-fit line	Less than ±0.10 mm (±4 mils) standard range; less than ±0.15 mm (±6 mils) extended range
Frequency response	0 to 8 kHz, +0/-3 dB typical, with up to 305 m of field wiring
Field wiring	0.2 to 1.5 mm² (16 to 24 AWG), three-conductor shielded triad recommended, up to 305 m (1,000 ft)
Target size	Flat target 30.5 mm (1.2 in) minimum diameter; shaft 152 mm (6.0 in) recommended minimum
Sensor operating temperature	-52 to +100 °C (-62 to +212 °F); storage -52 to +105 °C
Humidity	100% condensing, non-submersible when connectors are protected; damp heat tested to IEC 68-2-3
Sensor material and weight	A380 aluminum; 255 g (9 oz)

How the 330780-91-05 senses gap

The 3300 XL 11 mm Proximitor Sensor excites the large 11 mm probe coil with a radio-frequency signal and converts the damping caused by the target into a negative dc voltage. Because the tip is bigger, the output is 3.94 V/mm (100 mV/mil) instead of 7.87 V/mm, and the linear range stretches to 4.0 mm (160 mils) compared with 2 mm on the 8 mm system. The datasheet describes the dc part as position and the ac part as vibration up to 8 kHz.

330780-91-05 and the approvals option

The datasheet lists approvals for the 3300 XL Proximitor Sensor, including cNRTLus Class I, Zone 0 AEx/Ex ia IIC T4/T5 Ga when installed with intrinsically safe zener barriers or galvanic isolators, and Zone 2 / Division 2 nA, ec ratings when installed with a non-incendive circuit. ATEX/IECEx entries include II 1 G Ex ia IIC T4/T5 Ga and II 3 G Ex nA/ec IIC T4/T5 Gc. T5 applies at ambient -55 to +40 °C and T4 at -55 to +80 °C. The terminals must be installed so as to give at least IP54 protection.

These entries depend on installing to the stated Bently Nevada drawings (141092 for intrinsically safe, 140979 for non-incendive). Always check the marking on the delivered unit and the project certificate requirements.

Related parts and family overview for 330780-91-05

Without the approvals option, the same 9.0 m DIN sensor is 330780-91-00. Other siblings are 330780-50-00, 330780-51-00 and 330780-90-00. The ordering table for the 330780 sensor offers six length and mounting codes (50, 51, 52, 90, 91, 92) and two approval codes (00 and 05). Codes 52 and 92 are the versions supplied without mounting hardware. The sensors shown below are the ones commonly requested.

Part number	System length	Mounting	Approval option
330780-50-00	5.0 m (16.4 ft)	Panel mount	None
330780-51-00	5.0 m (16.4 ft)	DIN mount	None
330780-90-00	9.0 m (29.5 ft)	Panel mount	None
330780-91-00	9.0 m (29.5 ft)	DIN mount	None
330780-91-05	9.0 m (29.5 ft)	DIN mount	Multiple approvals (05)

Selection and ordering checklist for 330780-91-05

Confirm the approval scheme required by the project (cNRTLus or ATEX/IECEx)
Confirm intrinsically safe barrier or galvanic isolator design per the listed drawing
Confirm probe and extension carry compatible approvals (option 05 on probes)
Confirm the 9.0 m total system length
Confirm DIN-rail mounting
Obtain marking and certificate copies with the order

Installation, commissioning and maintenance of the 330780-91-05

Install the sensor to the drawing referenced in the datasheet, and use a supply and barrier arrangement that keeps the supply between -23 and -26 Vdc when barriers are in the circuit. The extended linear range does not apply with zener barriers.

Probes and extension cables in the same chain should also be ordered with the matching approval option 05 so the whole system is consistent.

Enclosure IP54 or better for the terminals
Document barrier type and loop parameters in the loop file
Keep protectors on connectors in humid areas
Record the gap voltage at commissioning
Spare unit should carry the same approval option

Typical applications in Oman and the GCC

The 330780-91-05 suits classified-area projects in Oman and the GCC such as gas compression, refinery and petrochemical units where machinery protection signals pass through barriers or isolators. The long 9 m system keeps the Proximitor in a cabinet outside the zone while the probe and extension run to the machine.

Information to send with an RFQ for 330780-91-05

Part number 330780-91-05 and quantity
Approval scheme and area classification
Probe and extension part numbers (total 9.0 m) with approval options
Barrier or isolator type
Delivery location in Oman or the GCC and required date

Documents and quotation

The manufacturer datasheet for the 330780-91-05 is attached on this page under Documents, so wiring, ordering options and environmental limits can be checked before you order.

Approvals tables, temperature schedule and entity parameters are in the datasheet. Seven Star LLC is an independent supplier based in Muscat; submit the part number, quantity and delivery location and we reply with availability and a quotation.

Other Models in the 3300xl Proximitor 11mm Range

Seven Star LLC supplies models from the 3300xl Proximitor 11mm 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 330780-91-00 3300 XL 11 mm Proximitor, 9 m DIN	Vibration Monitoring	View details
Bently Nevada 330780-51-00 3300 XL 11 mm Proximitor, 5 m DIN	Vibration Monitoring	View details
Bently Nevada 330780-50-00 3300 XL 11 mm Proximitor, 5 m Panel	Vibration Monitoring	View details
Bently Nevada 330780-91-05 3300 XL 11 mm Proximitor, 9 m DIN	Vibration Monitoring	You are viewing this model

Datasheets & Documents

Datasheet Bently Nevada 330780-91-05 Datasheet Download

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About brand

Bently Nevada is the American machinery protection and condition monitoring brand behind the 3500 rack, the 3300 XL proximity probe and the System 1 software. It was founded in 1961 in Minden, Nevada, and is today a Baker Hughes business.

Seven Star LLC is an independent supplier in Muscat. We list Bently Nevada monitors, I/O modules, probes, proximitors, velocity transducers and transmitters for rotating equipment in Oman and the GCC, and source them by full part number.

Bently Nevada company profile

Established	1961, Minden, Nevada, USA, by Donald E. Bently. The business started earlier as Bently Scientific in Berkeley, California (1956).
Known for	The first commercial eddy-current proximity transducers for measuring shaft vibration and position on high-speed turbomachinery
Ownership	Acquired by GE Energy in 2002; part of Baker Hughes since GE Oil & Gas combined with Baker Hughes in 2017
Rack generations	5000 series (from 1965), 3300 series (from 1988), 3500 series (from 1995), Orbit 60 (current platform)
Product families	Machinery protection racks, proximity probes and proximitors, Keyphasor sensors, velocity and acceleration transducers, 2-wire vibration transmitters, general-purpose monitors, portable analyzers, wireless sensors and System 1 condition monitoring software
Typical machines	Steam and gas turbines, centrifugal and reciprocating compressors, pumps, motors, generators, fans and gearboxes

Milestones

1956: Donald E. Bently starts Bently Scientific in Berkeley, California.
1961: The company moves to Minden, Nevada, as Bently Nevada.
1965: The 5000 series monitoring system is introduced.
1988: The 3300 series follows.
1995: The 3500 machinery protection system is launched.
2002 and 2017: GE Energy acquires Bently Nevada; it becomes part of Baker Hughes in 2017.

Bently Nevada product series

Series	Type	What it does
3500	Machinery protection rack	Continuous online protection with alarm and danger relays. Modules include the 3500/15 power supply, 3500/20 rack interface, 3500/25 Keyphasor, 3500/42M proximitor/seismic, 3500/50 tachometer, 3500/60 temperature, 3500/33 relay and 3500/92 communication gateway
3500 recip modules	Reciprocating compressor monitoring	3500/70M impulse velocity, 3500/72M rod position and 3500/77M cylinder pressure
Orbit 60	Protection and monitoring platform	The current Bently Nevada platform for protection, condition monitoring and data integration with System 1
3300 XL 8 mm	Proximity transducer system	Probe, extension cable and proximitor sensor for radial vibration, thrust position and Keyphasor reference on fluid-film bearing machines; also 5 mm and 25 mm versions
330500 Velomitor, 190501 Velomitor CT	Piezo-velocity sensors	Casing velocity on rolling-element bearing machines and low-speed cooling tower fans
990 and 991	2-wire transmitters	4-20 mA vibration (990) and thrust position (991) signals straight into a PLC or DCS, without a monitor rack
1900/65A, 2300	Compact monitors	Protection for balance-of-plant pumps, fans and motors where a full 3500 rack is not justified

A proximity probe measures the gap to the shaft, so it sees shaft movement inside a fluid-film bearing directly. A velocity or acceleration sensor sits on the casing and suits rolling-element bearing machines. Critical turbomachinery usually carries two X-Y probes per bearing, two axial probes for thrust position and a Keyphasor probe for speed and phase.

Where Bently Nevada systems are used

In Oman and the GCC, Bently Nevada racks and probes protect gas turbines, compressors and steam turbines in gas processing, LNG, refining, petrochemical, power and desalination plants. Many installations are 3500 racks that have run for years, so most requests are for like-for-like module, probe, extension cable and proximitor replacements, plus upgrades to newer monitors.

Ordering and replacement: what we need

For probes and proximitors, send the full part number with all option digits (for example 330101-00-27-10-02-05). The digits set the probe length, cable length, connector and approvals, and the probe, cable and proximitor must match in total system length. For 3500 modules, send the module and I/O part numbers from the rack and say whether the I/O is internal or external termination, or barrier type. If a module is obsolete, we quote the replacement that Bently Nevada names and point out any configuration or firmware change.

Facts checked against Baker Hughes Bently Nevada pages and published company history, October 2026.

Browse Bently Nevada products by category: Vibration.

FAQ

Questions about the Bently Nevada 330780-91-05 3300 XL 11 mm

Answers from our engineering team on installation, compatibility and integration.

01What does 330780-91-05 mean?

It follows the 330780-AA-BB pattern. Code 91 means 9.0 m system with DIN mounting, and 05 means multiple approvals.

02What approvals does the datasheet list for the sensor?

It lists cNRTLus and ATEX/IECEx entries for the 3300 XL Proximitor Sensor, including Ex ia IIC T4/T5 Ga with barriers or isolators and Ex nA/ec IIC T4/T5 Gc for Zone 2.

03What are the temperature classes?

The datasheet gives T5 at ambient -55 to +40 °C and T4 at -55 to +80 °C for the Proximitor Sensor.

04Does the supply change with barriers?

Yes. Without barriers -17.5 to -26 Vdc is allowed; with barriers it must be -23 to -26 Vdc.

05Is a barrier or isolator required?

For the intrinsically safe Zone 0 rating the sensor must be installed with zener barriers per drawing 141092 or with galvanic isolators.