330500 Velomitor Piezo-velocity Sensor
Datasheet

Bently Nevada Machinery Condition Monitoring141632 Rev. R

Description
Bently Nevada Velomitor Piezo-velocity Sensors are designed
to measure absolute (relative to free space) bearing housing,casing, or structural vibration. The 330500 is a specialized
piezoelectric accelerometer that incorporates embedded
integrated electronics in a solid-state design.
Because the 330500 incorporates solid-state electronics andhas no moving parts, it does not suffer from mechanicaldegradation and wear, and can be mounted vertically,horizontally, or at any other angle of orientation
Most common machine malfunctions (unbalance,misalignment, etc.) occur on the rotor andoriginate as an increase (or at least a change) inrotor vibration. For any individual casing
measurement to be effective for overall machine
protection, the system must continually transmit asignificant amount of rotor vibration to themachine casing, or mounting location of thetransducer.
In addition, be careful to install the accelerometertransducer on the bearing housing or machine
casing. Improper installation may decrease thetransducer amplitude and frequency response
and/or generate false signals that do not represent
actual vibration. Refer to the appropriate instruction
manuals and Application Notes.
Upon request, Bently Nevada provides engineering
services that can identify the appropriate machine330500 Velomitor Piezo-velocity Sensor
Datasheet141632 Rev. R

housing measurements andinstallation assistance if needed.

If you integrate the 330500 Velomitor
output to measure displacement,
electrical noise from interference andthe transducer circuit can beamplified. The noise can degrade
performance of 330500 transducers
and produce inaccurate
displacement data.

2/14

330500 Velomitor Piezo-velocity Sensor
Datasheet141632 Rev. R

Specifications

Maximum
Cable Length

Parameters are specified from +20 °C to +30 °C(+68 °F to +86 °F) and at 100 Hz unless otherwise
indicated.

Environmental Limits

Operating the transducer outside thespecified limits may result in false
readings or loss of machinemonitoring.

OperatingTemperature
Range
Shock
Survivability

Electrical
Sensitivity

3.94mV/mm/s (100 mV/in/s)±5%.

Frequency
Response

4.5 Hz to 5 kHz (270 cpm to300 kcpm) ±3.0 dB.
6.0 Hz to 2.5 kHz (360 cpm to150 kcpm) ±0.9 dB.

Temperature
Sensitivity-14% to +7.5% typical over theoperating temperature
range.

Velocity Range

1270 mm/s (50 in/s) peak.

Transverse
Sensitivity

Less than 5% of sensitivity.

Amplitude
Linearity±2% to 152 mm/s (6 in/s)
peak.

MountedResonant
Frequency

Greater than 12 kHz.

Output Bias
Voltage-12 ±3.0 VDC , overtemperature referenced toPin A.

Dynamic
OutputImpedanceLess than 2400 Ω

RelativeHumidity

Broadband
0.004 mm/s (160 μin/s) rms,
Noise Floor (4.5nominal
Hz to 5 kHz)Grounding

305 metres (1,000 feet) ofcable, part number 02173006,
with no degradation ofsignal.

Case isolated

3/14-55°C to 121°C(-67°F to 250°F)
5,000 g peak, maximum
To 100% non-submerged;
case is hermetically-sealed.

Base Strain
Sensitivity

0.005 in/s/mstrain.

Magnetic Field
Susceptibility<51 min/s/gauss (50 gauss,50-60Hz).

330500 Velomitor Piezo-velocity Sensor
Datasheet141632 Rev. R

Physical
Weight142 grams (5.0 oz), typical.

Diameter

25.3 mm (0.995 in).

Height63.2 mm (2.49 in).

Case Material

316L stainless steel.

Connector

2-pin Mil-C-5015
hermetically-sealed, 316L
stainless steel shell.

MountingTorque32-46 kg cm (24-40 in-lb)
max.

Polarity

When the sensor casemotion is toward theconnector, Pin A becomes
positive with respect to pin B.

Recommended
cable length(assuming
max vibrationof 50g,frequency 10kHz, and cable 208 ft (63m)
capacitance
200 pf/m.) For
longer lengths,
contact BentlyNevada TechSupport.)

4/14

330500 Velomitor Piezo-velocity Sensor
Datasheet141632 Rev. R

Compliance andCertifications
FCC
This device complies with part 15 of theFCC Rules. Operation is subject to thefollowing two conditions:llThis device may not cause harmfulinterference.
This device must accept any
interference received, includinginterference that may cause
undesired operation.

EMC
EMC Directive 2014/30/EU

RoHS
RoHS Directive 2011/65/EU

Maritime
DNV rules for classification – Ships
DNV rules for classification – High
speed and light craft
DNV offshore standards

5/14

330500 Velomitor Piezo-velocity Sensor
Datasheet141632 Rev. R
330525Hazardous Area Approvals
For the detailed listing of country andproduct specific approvals, refer tothe Approvals Quick Reference Guide(108M1756) available from Bently.com.

T4 @ -40°C ≤ Ta ≤ 100°C
Ex nL IIC T4
AEx nA IIC T4
Class I, Div 2, Groups A, B, C, D
Install per dwg 167539
T4 @ -40°C ≤ Ta ≤ 100°C

CSA/NRTL/C
190501 (Agency Approval Options 01 through 04)
IntrinsicallySafe

Ex ia IIC T4:
Class I, Div 1, Groups A, B, C, D.
Class II, Group E, F and G
Class IIIAEx ia IIC T4:
Class I, Div 1, Groups A, B, C, D;
Class II, Groups E, F, G
Class III
Install per drawing 167536
T4 @ -40°C ≤ Ta ≤ +100°C(-40°F ≤ Ta ≤ +212°F)

Intrinsically
Safe andNonIncendive

Ex nL IIC T4
Class I, Division 2, Groups A, B, C and D
AEx nA T4
Class I, Division 2, Groups A, B, C and D
Install per drawing 167536
T4 @ -40°C ≤ Ta ≤ +100°C(-40°F ≤ Ta ≤ +212°F)

330400,330425

Ex ia IIC T4
AEx ia IIC T4
Class I, Div 1 Groups A, B, C and D
Class II, Groups E, F, and G
Class III
T4 @ -40°C ≤ Ta ≤ 100°C
Install per dwg 167538

330500Ex ia IIC T4
AEx ia IIC T4
Class I, Division 1, Groups A, B, C and D
Class II, Groups E, F, G
Class IIIEx ia IIC T4
AEx ia IIC T4
Class I, Division 1, Groups A, B, C and D
Class II, Groups E, F, G
Class III
Install per dwg 167537
T4 @ -40°C ≤ Ta ≤ 100°C
Ex nL IIC T4
AEx nA IIC T4
Class I, Div 2, Groups A, B, C, D
Install per dwg 167537
T4 @ -40°C ≤ Ta ≤ 100°C

6/14

330500 Velomitor Piezo-velocity SensorDatasheet

141632 Rev. R

ATEX/IECEx
190501, 330400, 330425, 330500, 330525

Hazardous Area Conditions ofSafe Use

190501
II 1 GEx ia IIC T4 Ga

ATEX/IECEx
Zone 0/1:

Entity Parameters

Equipment must be connected to equipment,
which meets the abovelisted entity parameters.

II 3 D
Ex na IIC T4 Gc
Ex tc IIIC T130°C Dc
T4@ Ta = -55°C to 121°C

The cables type A or B (in compliance with EN60079-25) must respect the cable parameterslisted with the entity parameters.

Zone 0/1

Zone 2

Ui= 30V

Ui= 30V

Zone 2 :Ii= 200mA

Ii= 200mA

Pi= 0.75W

Pi= 1.14W

The supply electrical parameters shall not
exceed the values mentioned in the tables
above.

Ci-27.2nF
Li= 0330400, 330425,330500, 330525

EntityParameters

II 1 GEx ia IIC T4 Ga

II 3 D
Ex na IIC T4 Gc
Ex tc IIIC T130°C Dc
T4@ Ta = -55°C to 121°C
Zone 0/1

Zone 2

Ui= 28V

Ui= 28V

Ii= 150mA

Ii= 150mA

Pi= 0.84W

Pi= 1.26W

Ci-10.8nF
Li= 07/14

330500 Velomitor Piezo-velocity Sensor
Datasheet141632 Rev. ROrdering Information
For the detailed listing of country andproduct specific approvals, refer tothe Approvals Quick Reference Guide(108M1756) available from Bently.com.

Velomitor Piezo-velocity Sensor
330500-AA-BB
A: Mounting Thread Adaptor Option

Feet

Meters (approximate)

10 ft

3.0 m

12 ft

3.6 m

15 ft

4.5 m

17 ft

5.0 m

20 ft

6.0 m

25 ft

7.6 m

30 ft

9.0 m

33 ft

10.0 m50 ft

15.2 m99 ft

30.0 m00

No adapter

01

1/2 - 20 UNF

02

M8 x 103

1/4 - 28 UNF

Custom Cable Part Numbers

04

1/4 - 20 UNC05

Unavailable for 330500.

You can order custom cable lengths inincrements of 1.0 ft (305 mm) at additional cost.
Some cables have a minimum and maximumlength.

Note: For 1/4-18 NPT mounting, order 330525.
06

5/8 – 18 UNF

07

3/8 – 16 UNC

08

1/2 – 13 UNC

Use ‘NN’ in these part numbers tospecify the length (in feet) of thecable you want to order.

B: Agency Approval Option00

Not required

01

CSA/US/C

02

ATEX (European)

04

Multiple approvals (CSA, ATEX)Interconnection Cables
Standard Cable Lengths
Feet

Meters (approximate)

6 ft

1.8 m

8 ft

2.4 m

8/14

Part Number

Description

9571-NN

Two-conductor twisted,shielded 22 AWG cable with
two-socket moistureresistant female connector
at one end, terminal lugs at
the other end. Used with
monitors. Not for use with
21128 Velocity Transducer
Housing.
Min. length: 2.0 ft (0.6 m)
Max. length: 99 ft (30 m)

330500 Velomitor Piezo-velocity Sensor
DatasheetPart Number

Description

84661-NN

Two-conductor twisted,shielded 22 AWG armoredcable with two-socket
moisture-resistant female
connector at one end,terminal lugs at the otherend. Used with monitors. Notfor use with 21128 Velocity
Transducer Housing.
Min. length: 3.0 ft (0.9 m)
Max. length: 96 ft (29 m)

89477-NN125065-NN

141632 Rev. R

Velocity Transducer Housing
Assembly21128-AA-BB
A: Mounting Thread Option

Two-conductor 18 AWG
twisted, shielded cable withright angle two-socket plugat one end, terminal lugs at
the other end. Used withmonitors and with 21128
Velocity Transducer Housing.
Min. length: 2.0 ft (0.6 m)
Max. length: 99 ft (30 m)

01

Unthreaded02

3/4 - 14 NPT

03

1/2 - 14 NPT

04

1/2 - 12 BSP

B: Cable Exit Fitting Option
01

1/2 - 14 NPT plug02

1/2 -14 NPT explosion-proof

03

1/2 -14 NPT explosion-proof with cablegland seal
When using the 21128 Housing, cablepart number 89477-AA is necessary
to connect the Velomitor Sensor to amonitor.

Two-conductor 18 AWG
twisted, shielded cable with
two-socket plug andfluorosilicone elastomer
boot at one end, terminal
lugs at the other. Used withmonitors. Not for use with21128 Velocity Transducer
Housing.
Min. length: 2.0 ft (0.6 m)
Max. length: 99 ft (30 m)

Velocity Transducer Housing –CENELEC approved
107770-AA-BB
This version is a combination of the 330500
Velomitor Sensor and a 21128 Housing preinstalled at the factory. It is also rated for
CENELEC Zone 1, Group IIC hazardous area
applications.
A: Mounting Thread Option
01

Unthreaded02

3/4 - 14 NPT

03

1/2 - 14 NPT

04

1/2 - 14 BSP

B: Cable Exit Fitting Option
01

9/14

1/2 - 14 NPT plug

330500 Velomitor Piezo-velocity Sensor
Datasheet02

1/2 - 14 NPT explosion-proof

03

1/2 - 14 NPT explosion-proof with cablegland seal

141632 Rev. R

10/14

330500 Velomitor Piezo-velocity Sensor
Datasheet141632 Rev. R

Part numberAccessories
Part number

Description

100076330500 Velomitor Sensor
and Velomitor XA Sensor
User Guide

02173006

Bulk cable; 2 conductor 18
AWG twisted, shielded cablewithout connectors orterminal lugs. Specify
number of feet.

46000-01

Magnetic Base for temporary
mounting of Velomitor
Sensors. Used with 1/4 - 28
UNF mounting threadadapters.

46122-01

Quick Connect forsemi-permanent mountingof Velomitor Sensors. Used
with 1/2 - 20 UNF mounting
thread adapters.

89409-01

Individual 1/2 - 20 UNF
mounting adapter.

89410-01

Individual M8 x 1 mountingadapter.

89411-01

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. Spares
only. For new installations,order 330525 velometer.

04300015

Individual 5/8 - 18 UNF
mounting adapter.

Description
Individual 1/2 - 13 UNC
mounting adapter.

161191123135-01

11/14

The Velomitor Sensor isshipped with an adapter.
Individual adapters areavailable as spares.
Velomitor Sensor PowerModule.

330500 Velomitor Piezo-velocity SensorDatasheet

141632 Rev. R

Graphs and Figures

1. 2-pin, MIL-C-5015 receptacle
2. 15/16 inch hexagonal
3. 12.7 (0.500) diameter, 0.8 (0.030) deep counterbore
4. 25.3 (0.995) diameter
5. 3/8-24 UNF-2B, 6.4 (0.250) minimum threaded depth, 14.0 (0.550) maximum drill depth
Figure 1: Velomitor Piezo-Velocity Sensor Dimensional Drawing

12/14

330500 Velomitor Piezo-velocity Sensor
Datasheet141632 Rev. R

Figure 2: Typical Amplitude Response

Figure 3: Typical Phase Response

13/14

330500 Velomitor Piezo-velocity Sensor
Datasheet141632 Rev. R

Copyright 2022 Baker Hughes Company. All rights reserved.

Bently Nevada, Velomitor and Orbit Logo are registered trademarks of Bently Nevada, a Baker Hughes business, in theUnited States and other countries. The Baker Hughes logo is a trademark of Baker Hughes Company. All otherproduct and company names are trademarks of their respective holders. Use of the trademarks does not imply any
affiliation with or endorsement by the respective holders.
Baker Hughes provides this information on an “as is” basis for general information purposes. Baker Hughes does notmake any representation as to the accuracy or completeness of the information and makes no warranties of any
kind, specific, implied or oral, to the fullest extent permissible by law, including those of merchantability and fitness
for a particular purpose or use. Baker Hughes hereby disclaims any and all liability for any direct, indirect,
consequential or special damages, claims for lost profits, or third party claims arising from the use of theinformation, whether a claim is asserted in contract, tort, or otherwise. Baker Hughes reserves the right to makechanges in specifications and features shown herein, or discontinue the product described at any time without
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
repackaged without the express written consent of Baker Hughes. This product or associated products may becovered by one or more patents. See Bently.com/legal.

1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 (US) or Bently.com/support
Bently.com

14/14