9200 and 74712 Seismoprobe Velocity
Transducers
Datasheet

Bently Nevada Machinery Condition Monitoring

141626 Rev. R

Description
Bently Nevada Seismoprobe Velocity Transducer Systems aredesigned to measure absolute (relative to free space)bearing housing, casing, or structural vibration. The two-wiresystems consist of a transducer and appropriate cable.
The Seismoprobe family of velocity transducers is a two-wiredesign that uses moving-coil technology. It provides a
voltage output directly proportional to the transducer'svibration velocity.
Moving-coil transducers are less sensitive to impact or
impulsive excitation than solid-state velocity transducers,which are inherently accelerometers with embedded
integration electronics.
Moving-coil transducers are less sensitive to impact or
impulsive excitation and can represent a good choice forcertain applications. Because they don’t require external
power, they are convenient for portable measurement
applications.
For most installations, Bently Nevada's Velomitor
family of velocity transducers, which incorporate
solid-state technology, provide improved
performance and ruggedness for casing velocity
measurement applications.9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Available Types

appropriate instruction manuals andApplication Notes.

Two types of Seismoprobe Velocity Transducer
are available:llUpon request, Bently Nevada provides
engineering services that can identify
the appropriate machine housing
measurements and installation
assistance if needed.

9200: The 9200 is a two-wire transducer
suitable for continuous monitoring or forperiodic measurements in conjunction
with test or diagnostic instruments. Whenordered with the integral cable option,
the 9200 has excellent resistance tocorrosive environments without need ofadditional protection.
74712: The 74712 is a high temperatureversion of the 9200.

Interconnect cables are available forconnecting the 9200 and 74712 transducers toother instruments. These cables are available invarious lengths with or without stainless steelarmor.
When ordering the 9200 and 74712
Seismoprobe Velocity Transducers, expect
approximately a six week lead time. That leadtime can vary based on component availability
and configuration. For projected lead times foryour specific order, contact your local BentlyNevada representative.
Most common machine
malfunctions (unbalance,misalignment, etc.) occur on therotor and originate as an increase (orat least a change) in rotor vibration.
For any individual casing
measurement to be effective foroverall machine protection, thesystem must continually transmit asignificant amount of rotor vibration
to the machine casing, or mounting
location of the transducer.
In addition, be careful to install theaccelerometer transducer on the
bearing housing or machine casing.
Improper installation may decrease
the transducer amplitude andfrequency response and/or generate
false signals that do not represent
actual vibration. Refer to the2/18

9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Specifications

Amplitude
Linearity±5% from 0.01 to 5.0 in/s (0.254to 127 mm/s) at 100Hz(6000CPM)

Specifications are at approximately +22°C(+72°F) with 25 mm/s (1 in/s) of machine casing
vibration at 100 Hz (6000 cpm) with a 10 kΩ load
unless otherwise specified.

ShockresistanceWithstands 50 g peakmaximum acceleration along
non-sensitive axis.

Transversesensitivity±10% maximum of the sensitive
axis sensitivity at 100 Hz and 1.0in/s (2.54 cm/s)

Electrical
Sensitivity

20 mV/mm/s (500 mV/in/s),±5% when properly terminatedand oriented at the angle ofcalibration.

Calibration
Load

10 kΩ Terminal "A" to "B" Output
taken across pins "A" and "B"

Pin A goes positive with respect
Polarity ofto Pin B when the transducer
output signal case velocity is towards theconnector.

Sensitivity
Temperature 0.2%/°C
CoefficientFrequency
Response See
TheoreticalVelocity
Seismoprobe
Frequency
Response onpage 10.

Frequency
response

Lead wire
length

4.5 to 1000 Hz (270 to 60,000CPM); +0, -3dB typical.

Environmental Limits

10 to 1000 Hz (600 to 60,000CAM); +0, -3dB typical.

9200: -29°C to +121°C
Operating(-20°F to +250°F).
and Storage
74712: -29°C to +204°C
Temperature:(-20°F to +400°F).

15 to 1000 Hz (900 to 60,000CPM); +0, -3dB typical.
From minimum operating
frequency (see Ordering
Information) to 1 kHz (60,000cpm); +0, -3dB typical.

Dust and moisture resistant.

Environment

Please contact Bently Nevadafor detailed calibration data.
Dynamicoperatingrange

2.54 mm (0.100 in) peak topeak maximum displacement.

VelocityRange

25 mm/s (1 in/s) (at +22 °C ofcasing vibration at 100 Hz witha 10 kΩ load.

CoilResistance

1.25 kΩ ±5%

Locked CoilInductance

125 mH, typical

305 meters (1,000 feet)maximum between
Seismoprobe Velocity
Transducer and 3300 or 3500
Monitor. Consult manual for
frequency roll-off at longer
lengths.

RelativeHumidity

3/18

Contact your Sales
Professional
regardingtransducer
operation in aradiation
environment.
To 95%, noncondensing.
100%, non-submerged, whenordered with integral cable.

9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

MechanicalCase andAdapter
Material

Anodized aluminum A204

GasketMaterial

9200: Neoprene
74712: Silicone

Connector Material
Top andCadmium-plated aluminum,Side Mount neoprene, and silver-plated
Options
copperTerminal
Block
OptionPolyphenylene Sulfide withnickel-plated copper contacts.

Mounting Torque1/2-20, 1/420, 1/4-28,
5/8-18, orM10X1
5.6 N•m (50 in•lb)
mountingbase
options:8-32
threadedstuds

1.41 N•m (12.5 in•lb)

PhysicalHeight

102 mm (4 in) typical(depending on connectoroption).

Diameter

41 mm (1.6 in) typical.

Weight9200 = 300 grams (10.5ounces) typical.
74712 = 480 grams (17 ounces)typical.

All Seismoprobe Velocity
Seismoprobe
Transducers are specified for
Velocity
mounting orientation (seeTransducer
Graphs and Figures onorientation
page 10).

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9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Hazardous Area Approvals

Compliance andCertifications

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

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

74712 and 9200
cNRTLusThis device may not cause harmfulinterference.
This device must accept any
interference received, includinginterference that may cause
undesired operation.

Class I, Division 1, Groups A, B, C and D;Class II, Groups E, F and G; Class III:
Install per drawing CA 22000
Class I, Zone 2: A/Ex nA IIC T6 Gc;
Class I, Zone 2: A/Ex ec IIC T6 Gc:

EMC

T6 @ Ta = -20°C to +40°C

European Community Directive:
EMC Directive 2014/30/EU

ATEX/IECEx

Standards

II 1 G Ex ia IIC T6 Ga

EN 61326-1; Immunity/emission forIndustrial Environments

II 3 G Ex nA IIC T6 Gc

RoHS

II 3 G Ex ec IIC T6 Gc
T6 @ Ta = -20°C to +40°C

European Community Directive:
RoHS Directive 2011/65/EU

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9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Ordering Information
For the detailed listing of country andproduct specific approvals, refer tothe Approvals Quick Reference Guide(document 108M1756) at Bently.com.

22

22 feet (6.7 meter)32

32 feet (9.8 meter)

50

50 feet (15.2 meter)

C: Mounting Base Option
01

Circular; 1/4-20 UNC stud02

Circular; 1/4-28 UNF stud03

Rectangular flange

04

Circular; with three 8-32 threaded
studs on a 44 mm (1.75 in) diameterbolt circle

Two-wire Transducer05

No base; 1/2-20 UNF-3A stud

9200-AA-BB-CC-DD

06

Isolated circular 1/4-20 UNC stud

07

Isolated circular 1/4-28 UNF stud08

Isolated rectangular flange

An isolated base (‘06’ thru ‘09’, or ‘11’,‘12’ in Mounting Base Option) is
required when ‘04’ Agency ApprovalOption is selected.

A: Transducer Mounting Angle/Minimum
Operating Frequency Option
01

0 ±2.5, 4.5 Hz (270 cpm)

09

Isolated circular 5/8-18 UNF stud02

45 ±2.5, 4.5 Hz (270 cpm)

10

Circular; M10X1 stud03

90 ±2.5, 4.5 Hz (270 cpm)

11

Isolated circular M10X1

06

0 ±100, 10 Hz (600 cpm)

12

Isolated circular 1/2-20 UNF-2A

09

0 ±180, 15 Hz (900 cpm)

D: Agency Approval Option

B: Connector/Cable Option

00

No Approvals

01Top Mount (no cable)

01

CSA

02

Side Mount (no cable)

04

ATEX/IECEx

05

Terminal block top mount (nocable)

10 through 50
Integral hardline cable (see Figure 7 forexample). Option number corresponds tocable length in feet. Standard cable lengths
are shown below. Other cable lengths
between 7 feet and 50 feet may be available
through custom products. When ordering forhazardous area
10

10 feet (3.0 meter)

15

15 feet (4.6 meter)

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9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

High-temperature Two-wireTransducer

D: Agency Approval Option
00

No Approvals

Standard Temperature -20°F to +400ºF (-29°Cto +204ºC)

01

CSA

04

ATEX/IECEx

74712-AA-BB-CC-DD

Interconnection Cables

A: Transducer Mounting Angle/Minimum
Operating Frequency Option
01

0 ±2.5, 4.5 Hz (270 cpm)

02

45 ±2.5, 4.5 Hz (270 cpm)

The standard cable lengths below are available.
You can order custom cable lengths inincrements of one foot at additional cost. Somecables have a minimum and maximum length.
For details, see each part description below.

03

90 ±2.5, 4.5 Hz (270 cpm)

Standard Cable Lengths06

0 ±100, 10 Hz (600 cpm)

07

0 ±180, 15 Hz (900 cpm)

Feet

B: Mounting Base Option
01

Circular; 1/4-20 UNC stud02

Circular; 1/4-28 UNF stud03

Rectangular flange

04

Circular; with three 8-32 threaded
studs on a 44 mm (1.75 in) diameterbolt circle

05

No base; 1/2-20 UNF-3A stud

06

Isolated circular 1/4-20 UNC stud

07

Isolated circular 1/4-28 UNF stud08

Isolated rectangular flange

09

Isolated circular 5/8-18 UNF stud10

Circular; M10X1 stud11

Isolated circular M10X112

Isolated circular 1/2-20 UNF-2A

C: Connector Option
02

Top Mount

03

Terminal block top mount04

Side mount

7/18

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

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 m9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. RPart
Number

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

9755-NN2-conductor twisted, shielded 22
AWG (0.5 mm2) cable with 2socket moisture-resistant female
connector at one end, terminal
lugs at the other end (used withmonitors or vibration datacollectors).

Minimum length of 1.0 ft (0.3 m);
maximum length of 99 ft (30 m).

83968-NN

Cable operating temperature is-50˚C to 120˚C.

2-wire straight cable with 2-pin
female connector at one end andcoaxial connector in the otherend (used with instruments with
BNC connector input jacks).
Minimum length of 2.0 ft (0.6 m);
maximum length of 99 ft (30 m).

Minimum length of 2.0 ft (0.6 m);
maximum length of 99 ft (30 m).

84661-NN

2-wire shielded 22 AWG (0.5 mm2)
cable with 2-pin female
connectors at each end(connects 9200 or 74712
Seismoprobe Velocity
Transducers to Bently Nevada testkits).
Cable operating temperature is-70˚C to 150˚C.

Standard Cables

9571-NN

Description

High-Temperature Cables

2-conductor twisted, shielded 22AWG (0.5 mm2) armored cablewith 2-socket moisture-resistantfemale connector at one end,
terminal lugs at the other end(used with monitors or vibration
data collectors).

84508-NN

2-wire shielded 22 AWG (0.5 mm2)
cable with terminal lugs at eachend.
Minimum length of 1.0 ft (0.3 m);
maximum length of 99 ft (30 m).

Cable operating temperature is-50˚C to 120˚C.

84509-NN

Minimum length of 3.0 ft (0.9 m);
maximum length of 99 ft (30 m).

2-wire shielded 22 AWG (0.5 mm2)
armored cable with terminal lugs
at each end.
Minimum length of 3.0 ft (0.9 m);
maximum length of 70 ft (21 m).

84660-NN

2-wire shielded 22 AWG (0.5 mm2)cable with 2-socket female
connector at one end, terminal
lugs at the other end.
Minimum length of 3.0 ft (0.9 m);
maximum length of 99 ft (30 m).

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9200 and 74712 Seismoprobe Velocity Transducers
DatasheetPart
Number84510-NN141626 Rev. R

Description
2-wire shielded 22 AWG (0.5 mm2)
armored cable with 2-socket
female connector at one end,terminal lugs at the other end.
Minimum length of 3.0 ft (0.9 m);
maximum length of 70 ft (21 m).

87143-NN

2-wire shielded 18 AWG (1.0 mm2)
cable with terminal lugs at eachend. Withstands 200°C(392°F).
Minimum length of 3.0 ft (0.9 m);
maximum length of 99 ft (30 m).

Accessories
PartnumberDescription

46000-01

Magnetic Base for portable
mounting of Seismoprobe Velocity
Transducers.

46122-01

Quick connect for semipermanent mounting ofSeismoprobe Velocity
Transducers.

02173006

Bulk cable; 2-conductor, twisted,shielded. 18 AWG (1.0 mm2) cablewithout connectors or terminal
lugs. Specify number offeet. Withstands +200°C (+392°F).

00531061

Mating connector for 9200 and74712 Seismoprobe Velocity
Transducers.

00530574 Cable Mounting Clamp

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9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Graphs and Figures

Figure 1: Seismoprobe Orientation
All Seismoprobe Velocity Transducers are specified for the mounting orientations shown here.
0° is vertical, as viewed from driver end of the monitored machine.

Figure 2: Theoretical Velocity Seismoprobe Frequency Response

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9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

Figure 3:141626 Rev. R

Theoretical Phase Shift between Output and Case Velocity

Figure 4: Top Mounted Conector(9200 Option B-01 or 74712 Option C-02)
Note: All dimensions are shown in millimeters (inches)

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9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Figure 5: Side Mounted Connector(9200 Option B-02 or 74712 Option C–04)

Figure 6: Terminal Block Connector(9200 Option B-05 or 74712 Option C–03)

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9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Figure 7: 9200 Standard Integral Cable Options B-10 through B–50
Integral cable is not available with the 74712 High Temperature Seismoprobe.

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9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Figure 8: 9200 (C) and 74712 (B) Mounting Base
Option -01 Circular base for 1/4-20 UNC-2B stud, or
Option -06 Isolated circular base for 1/4-20 UNC-2B stud.

Figure 9: 9200 (C) and 74712 (B) Mounting Base
Option -03 Rectangular Flange, orOption -08 Isolated Rectangular Flange

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9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Figure 10: 9200 (C) and 74712 (B) Mounting Base
Option -02 Circular base for 1/4-28 UNF-2B stud, or
Option -07 Isolated circular base for 1/4-28 UNF-2B stud15/18

9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Figure 11: 9200 (C) and 74712 (B) Mounting Base
Option -04: Circular base with three 8-32 studs.

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9200 and 74712 Seismoprobe Velocity Transducers
Datasheet

141626 Rev. R

Figure 12: 9200 (C) and 74712 (B) Mounting Base
Option -09 Isolated circular base with 5/8-18 UNF-2A stud.

Figure 13: 9200 (C) and 74712 (B) Mounting Base
Option -12 Isolated circular base with 1/2-20 UNF-2A stud.

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Datasheet

141626 Rev. R

Copyright 2023 Baker Hughes Company. All rights reserved.

Bently Nevada, M2, 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.
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

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