Bently Nevada 330505 Specifications

330505 Low Frequency Velocity Sensor

Datasheet

Bently Nevada Machinery Condition Monitoring

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, and
bearing 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 and
damage 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.

169872 Rev. F

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 in
locations that measure both shaft-relative and bearing­absolute vibration signals. You can mount 330505 sensors to
the 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 Hydro
Monitor, meeting the requirements of International
Organization for Standardization (ISO) Standard 10816-5 for
mechanical vibration on non-rotating parts in hydraulic
power and pumping plants.

Due to the nature of high amplitude, low frequency velocity
events, the 330505 Low Frequency Velocity Sensor is not
recommended for automated machinery protection. Due to
capacitance constraints, this sensor is not approved for
hazardous areas.

330505 Low Frequency Velocity Sensor
Datasheet 169872 Rev. F

Specifications

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 of
machine monitoring.

Electrical

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

Frequency
Response

Velocity
Range

Amplitude
Range

Amplitude
Linearity

Output Bias
Voltage

Maximum
Cable
Length

Environmental Limits

Operating
and storage
temperature
range

Shock
Survivability

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

102 mm/s (4 in/s) peak

See 330505 Vibration
Nomograph on page6.

±3%—102 mm/s (4 in/s) peak

-12 ±1 VDC

305 metres (1000 feet) with no
degradation of signal, when
used with 3500/46M

Maximum mounted surface
temperature

-40°C to +100°C (-40°F to
+212°F)

981 m/s2 (100g) peak

(typical)

Mounting See 330505 System Dimensional

Drawing on page7.

Case
material

Connector 2-pin Mil-C-5015 receptacle,

Mounting
Torque

Polarity Pin A becomes positive with





300 series stainless steel.

hermetically sealed, 300 series
stainless steel.

46 kg cm (40 in-lb) max.

respect to Pin B when the
applied velocity is from the base
to the top of the transducer.

Compliance and Certifications

FCC

This device complies with part 15 of the
FCC Rules. Operation is subject to the
following two conditions:

l This device may not cause harmful

interference.

l This device must accept any

interference received, including
interference that may cause
undesired operation.

EMC

EMC Directive 2014/30/EU

RoHS

Relative
Humidity

To 100% non-submerged; case
is hermetically sealed.

Physical

Weight < 375grams (13.2oz)

RoHS Directive 2011/65/EU

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330505 Low Frequency Velocity Sensor
Datasheet 169872 Rev. F

89411-01 Individual 1/4 - 28 UNF mounting

Ordering Information

For the detailed listing of country and
product specific approvals, refer to the
Approvals Quick Reference Guide
(108M1756) available from Bently.com.

330505-AA-BB-CC

89412-01 Individual 1/4 - 20 UNC mounting

89413-01 Individual 1/4 - 18 NPT mounting

04300015 Individual 5/8 - 18 UNF mounting

adapter

adapter

adapter

adapter.

A: Transducer Mounting Angle

0 1 0° ± 10°

0 2 90° ± 5°

0 3 180° ± 10°

B: Internal Mounting Thread

0 2 3/8-24 UNF-2B

C: Mounting Adapter Option

0 0 No Adapter

0 1 1/2 - 20 UNF

0 2 M8 x 1

0 3 1/4 - 28 UNF

0 4 1/4 - 20 UNC

0 5 1/4 - 18 NPT

0 6 5/8 - 18 UNF

161191 Individual 1/2 - 13 UNC mounting

adapter

Interconnection Cables

The following standard cable lengths are
available. 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.

Standard Cable Lengths

Feet Meters (approximate)

6 ft 1.8 m

8 ft 2.4 m

10 ft 3.0 m

12 ft 3.6 m

15 ft 4.5 m

0 7 3/8 – 16 UNC

Accessories

For more information, please refer to the
330505 Low Frequency Velocity Sensor User
Guide (document 169873).

Part
number

89409-01 Individual 1/2 - 20 UNF mounting

adapter.

89410-01 Individual M8 x 1 mounting

adapter

Description

17 ft 5.0 m

20 ft 6.0 m

25 ft 7.6 m

30 ft 9.0 m

33 ft 10.0 m

50 ft 15.2 m

99 ft 30.0 m

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330505 Low Frequency Velocity Sensor
Datasheet 169872 Rev. F

Cable Part Numbers

Part number Description

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

02173034 Splash-Proof Interconnect

Cable

Recommended for high
electromagnetic noise
environment and European
Conformance (CE).

Shielded 0.382 mm2 (22
AWG) cable with a splash
proof boot over a female
connector at the transducer
end and flush cut at the
monitor end. Temperature
range -55 to 125°C (-67 to
257°F). See Graphs and

Figures.

CB2W100­AAA†

Splash-Proof Interconnect
Cable

Shielded 0.382 mm2 (22
AWG) 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.



Standard lengths:

Part number Description

9571-AA† Standard Interconnect Cable



Shielded 0.382 mm2 (22
AWG) cable with a moisture
resistant female connector at
the transducer end and ring
lugs at the monitor end.
Temperature range -29 to
121°C (-20 to 250°F). See

Graphs and Figures.



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

84661-AA† Standard Armored

Interconnect Cable



Stainless steel armor over
shielded 0.382 mm2 (22 AWG)
cable with a moisture
resistant female connector at
the transducer end and ring
lugs at the monitor end.
Temperature range -29 to
121°C (-20 to 250°F). See

Graphs and Figures.



Minimum length 3 ft (0.91 m);
maximum length 96 ft (29 m).

89477-AA† Right Angle Interconnect

Cable

01515 ft (4.5 m)

03232 ft (9.8 m)

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)



Shielded 0.963 mm2 (18 AWG)
cable with a moisture
resistant right angle female
connector at the transducer
end and ring lugs at the
monitor end. Temperature
range -29 to 121°C (-20 to
250°F). See Graphs and

Figures.



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330505 Low Frequency Velocity Sensor
Datasheet 169872 Rev. F

Part number Description

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

122129-AA† Short Run Interconnect Cable



Shielded 0.963 mm2 (18 AWG)
cable with a moisture
resistant female connector at
the transducer end and ring
lugs at the monitor end.
Temperature range -29 to
121°C (-20 to 250°F). See

Graphs and Figures.



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

02173006 0.963 mm2 (18 AWG) Bulk

Cable

Part number Description



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



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. Same
cable as used on 9571-AA and
84661-AA. Specify the number
of feet. The maximum length
that should be used with the
transducer is 305 m (1000 ft)

00502025 Spare Connector



Same connector as used on
9571-AA and 84661-AA

101212-01 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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330505 Low Frequency Velocity Sensor
Datasheet 169872 Rev. F

Figure 3: Typical Velocity Amplitude

Figure 4: Typical Velocity Phase Error

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330505 Low Frequency Velocity Sensor
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.

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

1631 Bently Parkway South, Minden, Nevada USA 89423

Phone: [phone] or 1.800.227.5514 (US only)

Bently.com

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