330505 Low Frequency Velocity Sensor
Datasheet

Bently Nevada Machinery Condition Monitoring

169872 Rev. F

Description
The Bently Nevada 330505 Low Frequency Velocity Sensor is
specifically designed for hydroelectric turbines where slow
rotating speeds require detecting a low signal to noise ratio.
It detects vibration of the stator core, stator frame, andbearing housing supports. It is designed to provide early
warning of pending machinery problems and to help you
diagnose problems before they become serious.
The sensor measures absolute vibration within the 0.5Hz to
1.0kHz range. Its two-wire design uses moving-coil technology
and embedded signal conditioning circuitry to provide a
voltage output directly proportional to the vibration velocity.
Stator core and stator frame vibration can cause fretting anddamage to the winding insulation. To detect these problems
before serious damage occurs, mount a 330505 sensor on
the outer diameter of the stator core and frame.
Bearing housing vibration can distort levels of vibration
measured by shaft-observing proximity probes. To detect
premature failure of machine components and prevent
significant machine problems, place 330505 sensors inlocations that measure both shaft-relative and bearingabsolute vibration signals. You can mount 330505 sensors tothe bearing housing either as a stand-alone measurement
or in the same orientation as existing proximity sensors.
The 330505 Transducer connects to the 3500/46M HydroMonitor, meeting the requirements of International
Organization for Standardization (ISO) Standard 10816-5 formechanical vibration on non-rotating parts in hydraulicpower and pumping plants.
Due to the nature of high amplitude, low frequency velocity
events, the 330505 Low Frequency Velocity Sensor is notrecommended for automated machinery protection. Due tocapacitance constraints, this sensor is not approved forhazardous areas.

330505 Low Frequency Velocity Sensor
Datasheet

169872 Rev. F

Specifications(typical)Parameters are specified from +20 to +30°C(+68 to +86°F) and 80Hz unless otherwise
indicated.
Operation outside the specified limits
may result in false readings or loss ofmachine monitoring.

ElectricalSensitivity

20 mV/mm/s (508mV/in/s) ±10%Frequency
Response

0.5—1000 Hz (30—60,000 cpm)
±3.0 dB;
1—200 Hz (60—12,000 cpm) ±0.9dB

VelocityRange

102 mm/s (4 in/s) peak

AmplitudeRange

See 330505 Vibration
Nomograph on page 6.

Amplitude
Linearity±3%—102 mm/s (4 in/s) peakSee 330505 System Dimensional
Drawing on page 7.

Casematerial

300 series stainless steel.

Connector

2-pin Mil-C-5015 receptacle,
hermetically sealed, 300 series
stainless steel.

Mounting
Torque46 kg cm (40 in-lb) max.

Polarity

Pin A becomes positive withrespect to Pin B when theapplied velocity is from the baseto the top of the transducer.

Compliance andCertifications
FCC

Output Bias -12 ±1 VDC
Voltage
MaximumCable
LengthMounting

This device complies with part 15 of theFCC Rules. Operation is subject to thefollowing two conditions:

305 metres (1000 feet) with nodegradation of signal, whenused with 3500/46MlEnvironmental LimitslOperating
Maximum mounted surface
and storage temperaturetemperature-40°C to +100°C (-40°F torange+212°F)
ShockSurvivability

981 m/s2 (100g) peak

RelativeHumidity

To 100% non-submerged; caseis hermetically sealed.

EMCEMC Directive 2014/30/EU

RoHS
RoHS Directive 2011/65/EU

PhysicalWeightThis device may not cause harmfulinterference.
This device must accept any
interference received, includinginterference that may cause
undesired operation.

< 375grams (13.2oz)

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Datasheet

169872 Rev. F

Ordering Information
For the detailed listing of country andproduct specific approvals, refer to theApprovals Quick Reference Guide(108M1756) available from Bently.com.

330505-AA-BB-CC
A: Transducer Mounting Angle01

0° ± 10°02

90° ± 5°03

180° ± 10°

Individual 1/4 - 28 UNF mounting
adapter

89412-01

Individual 1/4 - 20 UNC mounting
adapter

89413-01

Individual 1/4 - 18 NPT mounting
adapter

04300015

Individual 5/8 - 18 UNF mounting
adapter.

161191

Individual 1/2 - 13 UNC mounting
adapterInterconnection Cables
The following standard cable lengths areavailable. You can order custom cable lengths
in increments of one foot at additional cost.
Some cables have a minimum and maximum
length. For details, see each part description
below.

B: Internal Mounting Thread02

89411-01

3/8-24 UNF-2B

C: Mounting Adapter Option

Standard Cable Lengths00

No Adapter

01

1/2 - 20 UNF

Feet

Meters (approximate)02

M8 x 1

6 ft

1.8 m

03

1/4 - 28 UNF

8 ft

2.4 m

04

1/4 - 20 UNC

10 ft

3.0 m

05

1/4 - 18 NPT

12 ft

3.6 m

06

5/8 - 18 UNF

15 ft

4.5 m

07

3/8 – 16 UNC

17 ft

5.0 m

Accessories

20 ft

6.0 m

For more information, please refer to the330505 Low Frequency Velocity Sensor User
Guide (document 169873).

25 ft

7.6 m

30 ft

9.0 m

33 ft

10.0 m50 ft

15.2 m99 ft

30.0 mPart
numberDescription89409-01

Individual 1/2 - 20 UNF mounting
adapter.

89410-01

Individual M8 x 1 mounting
adapter

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330505 Low Frequency Velocity Sensor
Datasheet

169872 Rev. FPart number

Cable Part Numbers
Part number

9571-AA†

Description† NOTE: Use ‘AA’ in the part numbers below to
specify the length (in feet) of the cable youwant to order.
02173034

Standard Interconnect Cable

Shielded 0.382 mm2 (22AWG) cable with a moistureresistant female connector at
the transducer end and ringlugs at the monitor end.
Temperature range -29 to121°C (-20 to 250°F). See
Graphs and Figures.

Splash-Proof Interconnect
Cable
Recommended for highelectromagnetic noise
environment and European
Conformance (CE).

Minimum length 2 ft (0.60 m);
maximum length 99 ft (30 m).

Shielded 0.382 mm2 (22AWG) cable with a splash
proof boot over a female
connector at the transducer
end and flush cut at themonitor end. Temperature
range -55 to 125°C (-67 to257°F). See Graphs andFigures.
CB2W100AAA†

Description

84661-AA†Standard ArmoredInterconnect Cable

Stainless steel armor overshielded 0.382 mm2 (22 AWG)
cable with a moistureresistant female connector at
the transducer end and ringlugs at the monitor end.
Temperature range -29 to121°C (-20 to 250°F). See
Graphs and Figures.

Splash-Proof Interconnect
Cable
Shielded 0.382 mm2 (22AWG) cable with splash proof
over molded boot, blunt cut
at the monitor end.
Temperature range -50 to
200°C (-58 to 392°F). See
Graphs and Figures.

Minimum length 3 ft (0.91 m);
maximum length 96 ft (29 m).
89477-AA†Standard lengths:

Right Angle Interconnect
Cable

01515 ft (4.5 m)
03232 ft (9.8 m)

Shielded 0.963 mm2 (18 AWG)
cable with a moistureresistant right angle female
connector at the transducer
end and ring lugs at themonitor end. Temperature
range -29 to 121°C (-20 to250°F). See Graphs andFigures.

06464 ft (19.5 m)
112112 ft (34.1 m)
125125 ft (38.1 m)
150150 ft (45.7 m)
200200 ft (61.09 m)

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330505 Low Frequency Velocity Sensor
DatasheetPart number

169872 Rev. F

Part number

Description
Minimum length 2 ft (0.6 m);
maximum length 99 ft (30 m).

122129-AA†

Right angle connector kit.
Same connector as used on
89477-AA.

Short Run Interconnect Cable

Shielded 0.963 mm2 (18 AWG)
cable with a moistureresistant female connector at
the transducer end and ringlugs at the monitor end.
Temperature range -29 to121°C (-20 to 250°F). See
Graphs and Figures.

Minimum length 6 in (152mm); maximum length 24 in(610mm).
02173006

0.963 mm2 (18 AWG) Bulk
Cable

Shielded twisted pair. Same
cable as used on 89477-AA
and 122129-AA. Specify
number of feet.
02173007

0.382 mm2 (22 AWG) Bulk
Cable

Shielded twisted pair. Samecable as used on 9571-AA and84661-AA. Specify the numberof feet. The maximum lengththat should be used with thetransducer is 305 m (1000 ft)
00502025

Spare Connector

Same connector as used on9571-AA and 84661-AA
101212-01

Description

Right Angle Connector

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330505 Low Frequency Velocity Sensor
Datasheet

169872 Rev. F

Graphs and Figures

Figure 1: 330505 Vibration Nomograph

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330505 Low Frequency Velocity Sensor
Datasheet

169872 Rev. F

Figure 2: 330505 System Dimensional Drawing(Dimensions are in millimeters [inches].)

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Datasheet

169872 Rev. F

Figure 3: Typical Velocity Amplitude

Figure 4: Typical Velocity Phase Error

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Datasheet

169872 Rev. F

Figure 5: Splash-Prof Interconnect Cable(For available cable lengths and part numbers, See Interconnection Cables on page 3.

Figure 6: Splash-Proof Interconnect Cable(For available cable lengths and part numbers, See Interconnection Cables on page 3.

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330505 Low Frequency Velocity Sensor
Datasheet

169872 Rev. F

Figure 7: Standard Interconnect Cable(For available cable lengths and part numbers, See Interconnection Cables on page 3.

Figure 8: Standard Armored Interconnect Cable(For available cable lengths and part numbers, See Interconnection Cables on page 3.

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330505 Low Frequency Velocity Sensor
Datasheet

169872 Rev. F

Figure 9: Standard Armored Interconnect Cable(For available cable lengths and part numbers, See Interconnection Cables on page 3.

Figure 10: Standard Right-Angle Interconnect Cable(For available cable lengths and part numbers, See Interconnection Cables on page 3.

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330505 Low Frequency Velocity Sensor
Datasheet

169872 Rev. F

Figure 11: Short Run Interconnect Cable(For available cable lengths and part numbers, See Interconnection Cables on page 3.
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notice or obligation. Contact your Baker Hughes representative for the most current information.
The information contained in this document is the property of Baker Hughes and its affiliates; and is subject tochange without prior notice. It is being supplied as a service to our customers and may not be altered or its content
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1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 or 1.800.227.5514 (US only)
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