330530 Radiation Resistant Velomitor
Datasheet

Bently Nevada Machinery Condition Monitoring

176101 Rev. G

Description
Velomitor Piezo-velocity Sensors measure absolute bearing
housing, casing, or structural vibration relative to free space.
Unlike our Seismoprobe Sensor and other moving-coilvelocity transducers, Velomitor Piezo-velocity Sensors are
specialized solid-state piezoelectric accelerometers withembedded integration electronics. Because the sensors haveno moving parts, they do not suffer from mechanicaldegradation or wear and can be mounted vertically,horizontally, or at any other angle of orientation. In addition,
the 330530 sensor is specifically designed to function in a
gamma-radiation environment.
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330530 Radiation Resistant Velomitor
Datasheet

176101 Rev. G

housing measurements andinstallation assistance if needed.

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330530 Radiation Resistant Velomitor
Datasheet

176101 Rev. G

Post-Radiation ElectricalSpecificationsParameters are specified from +20 °C to +30 °C(+68 °F to +86 °F) room temperature and 100 Hz
unless otherwise indicated.

Sensitivity

Output Bias
Voltage, Ref:
Pin B to Pin A

Operation outside the specified limits
may result in false readings or loss ofmachine monitoring.

Pre-Radiation Electrical
Sensitivity

3.94 mV/mm/s (100 mV/in/s) ±5%

Output Bias
Voltage, Ref:
Pin B to Pin A-12.0 ± 1.0 V @ room
temperature-12.0 ± 3.45 V over temperature

Frequency
Response

6.0 Hz to 2.5 kHz (360 cpm to 150kcpm) ± 0.9 dB
4.5 Hz to 5.0 kHz (270 cpm to300 kcpm) ± 3.0 dB

Frequency
Response

635 mm/s (25 in/s) peakTransverse
Sensitivity

Less than 5% of sensitivity

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

MountedResonant
Frequency

Greater than 12 kHz

Broadband
Noise Floor(4.5 Hz to 5kHz)

0.008 mm/s (320 min/s) rms,
nominalMaximum
Cable
Length305 metres (1,000 feet) of cable,
Part Number 175873, with nodegradation of signal-12.0 ± 2.0 V @ room
temperature-12.0 ± 3.70 V over temperature
6.0 Hz to 2.5 kHz (360 cpm to 150kcpm) ± 1.0 dB
4.5 Hz to 5.0 kHz (270 cpm to300 kcpm) ± 3.0 dB

Temperature -10.0% to +12.5% typical over theSensitivity
operating temperature range

Temperature -11.0% to +10.5% typical over theSensitivity
operating temperature range
VelocityRange

3.94 mV/mm/s (100 mV/in/s) ±10% @ 3 Mrads
3.94 mV/mm/s (100 mV/in/s) ±12% @ 12 Mrads

3/10Velocity
Range

420 mm/s (16.5 in/s) peakTransverse
Sensitivity

Less than 5% of sensitivity

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

MountedResonant
Frequency

Greater than 12 kHz

Broadband
Noise Floor(4.5 Hz to 5kHz)

0.008 mm/s (320 min/s) rms,
nominalMaximum
Cable
Length305 metres (1,000 feet) of cable,
BN Part Number 175873, with nodegradation of signal

330530 Radiation Resistant Velomitor
Datasheet

176101 Rev. G

Environmental Limits
Polarity

Operating-55 °C to +121 °C (-67 °F to +250
Temperature°F)
Range
Shock
Survivability

5,000 g peak, maximum

Relative
Humidity

To 100% non-submerged (caseis hermetically sealed)

Base Strain
Sensitivity

0.005 in/s/mstrain

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

127 m (417 ft )Assuming max vibration of
Recommended
25 in/s, frequency 5 kHz, andCable Length
cable capacitance 200 pf/m.
For longer lengths, contact
Bently Nevada Tech Support.

Compliance andCertifications
FCC

12.0 Mrads, maximum
guarantee

Radiation
DosagePin A goes positive withrespect to Pin B when thesensor case motion istowards the connector.

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

The limits listed
above are what
Bently Nevada
guarantees. See theSummary Testing
Report at the end of
this document for
more details.

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

EMC

Physical

EMC Directive 2014/30/EU

Weight142 grams (5.0 ounces),
typicalDiameter

25.3 mm (0.995 in)

Height63.5 mm (2.5 in)Case Material

304L stainless steel

Connector

2-pin MIL-C-5015
hermetically sealed, 304
stainless steel

Mounting
Torque4.52 N-m (40 in-lbf)
maximum

RoHS
RoHS Directive 2011/65/EU

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

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330530 Radiation Resistant Velomitor
Datasheet

176101 Rev. G

09

Ordering Information

12.0 ft
12For the detailed listing of country andproduct specific approvals, refer tothe Approvals Quick Reference Guide(108M1756) available from Bently.com.

The following are standard lengths

330530-AA
A: Mounting Thread Adapter Option
No adapter

01

1/2 - 20 UNF

02

M8 x 103

1/4 - 28 UNF

04

1/4 - 20 UNC

05

1/4 - 18 NPT

06

5/8 – 18 UNF

07

3/8 – 16 UNC
1/2 - 13 UNC

08

Note: Minimum: 02 = 2 ft
Maximum: 99 = 99 ft

Velomitor Sensor

00

9.0 ftFeet

Meters (approx.)

6

1.8

8

2.4

10

3.0

12

3.6

15

4.5

17

5.0

20

6.0

25

7.6

30

9.0

33

10.0

50

15.2

99

30.0
Non-standard/custom lengths canalso be ordered at additional cost

If an application
requires a housing,our 21128 Velocity
Transducer Housing
uses the MountingThread Adapter Option–01 for 1/2 - 20 UNF. Not
InspiraVelocity Transducer Housing
Assembly21128-AA-BB

Interconnect Cable

A: Mounting Thread Option

330533-AA

01

Unthreaded02

3/4 - 14 NPT

03

1/2 - 14 NPT

04

1/2 - 14 BSP

A: Cable Length Option in feet
For the cables listed below, order inincrements of 1.0 ft (305 mm).
Example:5/10

330530 Radiation Resistant Velomitor
Datasheet

176101 Rev. G

B: Cable Exit Fitting Option
01

1/2 - 14 NPT plug02

1/2 - 14 NPT explosion-proof

04300015

Individual 1/2 - 13 UNC mounting
adapter½ - 14 NPT explosion-proof withcable gland seal

161191

When using the 21128
housing, cable partnumber 89477-AXX isnecessary to connect
the Velomitor Sensor
to a monitor.

03

Accessories
17587346000-01

46122-01

Quick Connect for semipermanent mounting of
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 mounting
adapter

89411-01

Individual 1/4 - 28 UNF mounting
adapter

89412-01

Individual 1/4 - 20 UNC mounting
adapter89413-01

Individual 1/4 - 18 NPT mounting
adapter

The Velomitor Sensor
is shipped with anadapter. Individual
adapters are available
as spares. Not Inspira101212-01

Velomitor Sensor connector kit.
Used with housings and retrofits.

123135-01

Velomitor Sensor Power Module

For more information concerning this product,
please refer to the 330500 Velomitor Sensor,
300525 Velomitor XA Sensor, and 330530
Radiation Resistant Velomitor Sensor User
Guide (document 100076).

Bulk Tefzel cable; 2 conductor 18
AWG twisted, shielded cable(same wire used in 330533)without connectors or terminallugs. Specify number of feet
Magnetic base for temporary
mounting of Velomitor Sensors.
Used with 1/4 - 28 UNF mounting
thread adapters.

Individual 5/8 – 18 UNF mounting
adapter

Product Disposal Statement
It is the responsibility of the nuclear site tocorrectly dispose of this hardware as requiredby regulations. The product is not covered
under the WEEE directive.

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330530 Radiation Resistant Velomitor
Datasheet

176101 Rev. G

Graphs and Figures
Note: All dimensions in millimetres (inches) unless otherwise specified.

1. 2-pin, MIL-C-5015 receptacle
2. 15/16” 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

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176101 Rev. G

Frequency Response Graphs

Figure 2: Frequency Response, Typical Amplitude Response

Figure 3: Frequency Response, Typical Phase Response

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176101 Rev. G

Summary - Testing Report(For complete details refer to the white paper “Test Report of the Radiation Resistant Velomitor sensor
330530”)We completed a series of tests to insure that the product will meet the specifications contained in thisdocument. The information in the white paper outlines the details regarding the testing and irradiation.
The customer can use the information in the whitepaper to validate how the product is used and infer
how the product could change with gamma-radiation exposures. Note, however, that any observation
or extrapolation of this data is not a guarantee of the product performance. Listed below arelimitations and boundary conditions.
Important items about the testing:ll

The Device Under Test (DUT) will have the largest parameter shift when the unit is powered up andbeing irradiated at the same time.
The gamma-radiation was from a Co60 source. A number of 16-inch-long rods were placed in acircular pattern around the DUT to establish uniform radiation and exposure levels around theDUT. The length of the rods ensured that the top and bottom of the DUT were also being
irradiated, albeit at a slightly lower level. The dosage rate is the sum effect of all of the rays
intersecting at the DUT.

The product was not designed or tested:llll

to be a part of the control loop as the product design is for monitoring purposes only,
for LOCA (loss of coolant accident), sometimes called LOC (loss of coolant), events,
to withstand neutron radiation, orfor spike or burst events.

Observation:llSensitivity:
o Starts at 3.94 mV/mm/s (100 mV/in/s) ± 5%.
o With each 3 Mrad gamma-radiation exposure the average change decreased 3%.
Output Bias Voltageo Starting point:n -12.0 ± 1.0 volts @ room temperaturen -12.0 ± 3.45 volts @ over temperature
As the device is irradiated, the DUT will shift in both directions, making the window larger.
This wider window results in a smaller dynamic range.

lAs a note: We tested a number of the units and at no time did any of the units fail. The numbersof units tested at the higher radiation level (maximum of 13 Mrad) did not constitute a significant
sample size to guarantee the product at these higher levels.

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Copyright 2022 Baker Hughes Company. All rights reserved.

Bently Nevada, Seismoprobe, Velomitor and Orbit Logo are registered trademarks of Bently Nevada, a Baker Hughes
business, in the United States and other countries. The Baker Hughes logo is a trademark of Baker Hughes Company.
All other product 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.
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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

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