190501 Velomitor CT Transducer
Datasheet

Bently Nevada Machinery Condition Monitoring141636 Rev. AD

Description
The Velomitor CT Velocity Transducer is a low-frequency
version of our standard Velomitor Piezo-velocity Sensor. Its
design specifically measures casing vibration velocity on
cooling tower and air-cooled heat-exchanger fan assemblies
that operate at or above 90 rpm (100 to 300 rpm typical).
The Velomitor CT Transducer can measure vibration
amplitudes at these frequencies as well as the vibration
frequencies generated by the fan motor and speed reducer.
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 accelerometer 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 the appropriate
instruction manuals and Application Notes.
Upon request, Bently Nevada provides engineering services
that can identify the appropriate machine housing
measurements and installation assistance if needed.

190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

Specifications

Noise Floor(1.5 Hz to 1kHz)

For more information, see
Typical Low Frequency Noise
Floor on page 15.

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

Base Strain
Sensitivity0.43 mm/s/μstrain (0.017in/s/μstrain).

GroundingInternal electronics are isolated
from case.

Maximum
Cable
Length305 metres (1,000 ft.) of cable(part number 02173006) withno degradation of signal.

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

Electrical
Sensitivity

Frequency
Response

Maximum continuous length ofcable available is 91.44 metres (300ft.) If longer lengths are required
they must be spliced or have aconnector installed on them.

3.94 mV/mm/s (100 mV/in/s)±5%.
3.0 Hz to 900 Hz(180 to 54,000 cpm) ±1.0 dB
1.5 Hz to 1.0 kHz(90 to 60,000 cpm) ±3.0 dB

Environmental Limits

Temperature -8% to +5% typical over theSensitivity
operating temperature range.

Velocity
Range

Operating-40°C to +85°C
Temperature (-40°F to +185°F).

63.5 mm/s pk (2.5 in/s pk) see
Operating Range for Metric
Units on page 13. See Operating
Range for English Units onpage 14.. Vibration
components in excess of 10g pk
above 1 kHz can significantly
reduce this range.

TransverseResponse

Less than 5% of the axial
sensitivity.

Amplitude
Linearity±2% to 63.5 mm/s pk(2.5 in/s pk)

MountedResonant
Frequency

9 kHz, minimum (studmounted, except quickdisconnect)

Output Bias
Voltage

10.1 Vdc ± 1.0 Vdc, Pin A
referenced to Pin B

Dynamic
OutputImpedance<400 Ω typical

Broadband

0.229 mm/s (0.009 in/s) pk.

Storage-40°C to +100°C
Temperature (-40°F to +212°F).
Shock Limit

5000 g pk, maximum.

HumidityLimit

100% condensing,non-submerged.

Magnetic<0.0068 mm/s/gauss (0.268Field
mil/s/gauss) @ 50 gauss, 50Susceptibility 60Hz

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190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

Mechanical
Weight<297 g (10.5 oz.), typical.

Mounting
Surface

33 mm diameter (1.3 indiameter).

Height

82 mm (3.2 in).

Case
Material

316L stainless steel

Connector

2-pin 316L stainless steel MIL-C5015, top.

Mounting
Torque4.5 N-m ± 0.6 N-m (40 in–lbf ± 5in-lbf).

Polarity

Pin A goes positive with respect
to Pin B when velocity is frombase to top of the transducer.

MountingAngle

Any orientation.

For more information on this product,
please refer to the Velomitor CT PiezoVelocity Transducer User Guide (document125389).

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190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

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

CSA/NRTL/C

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

190501 (Agency Approval Options 01
through 04)
Ex ia IIC T4:
Class I, Div 1, Groups A, B, C, D.
Class II, Group E, F and G
Class IIIEMC

AEx ia IIC T4:
Intrinsically Class I, Div 1, Groups A, B, C, D;
Safe
Class II, Groups E, F, G
Class IIIEMC Directive 2014/30/EU

RoHS
RoHS Directive 2011/65/EU

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

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190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

ATEX/IECEx
190501 Entity Parameters

Hazardous Area Conditions ofSafe Use

II 1 GEx ia IIC T4 Ga

ATEX/IECEx

II 3 D

Zone 0/1:

Ex na IIC T4 Gc
Ex tc IIIC T130°C Dc

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

T4@ Ta = -55°C to 121°C
Zone 0/1

Zone 2The cables type A or B (in compliance with EN
60079-25) must respect the cable parameterslisted with the entity parameters.

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= 05/16

190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

NPT

Ordering Information
Velomitor CT Velocity Transducer
190501 - AA - BB - CC
A: Mounting Hardware Option

22Adapter, 3/8-in 24 to 3/4-in 14
NPT

23Adapter, 3/8-in 24 to 1.0-in 11.5
NPT24Adapter, 3/8-in 24 to 1.25-in 11.5
NPT00

No stud

B: Connection Option

01

Stud 3/8-in 24 to 3/8-in 24

00

MIL-C-5015 connection interface

02

Stud 3/8-in 24 to 1/2-in 20

99

Unit with included 32-foot cable03

Adhesive Stud 3/8-in 24

C: Agency Approval Option

04

Stud M6x1 with 3/8-in 24 adapter

00

No Approvals

05

Adhesive Stud M6x1 with 3/8-24
adapter

0 1 through04

06

Stud 3/8-in 24 to 1/4-in 28

CSA/NRTL/C (Class I, Division 1),
ATEX/IECEx/CSA (Class I, Zone0/1)

07

Plate Stud 3/8-in 24 to 3/8-in 24

Interconnect Cable

08

Plate Stud 3/8-in 24 to 1/2-in 20

CB2W100 - AAA

09

Plate Stud 3/8-in 24 to 1/4-in NPT

10Plate Stud M6x1 to M6x1with 3/8in 24 adapter

11

Plate Stud 3/8-in 24 to 1/4-in 28

12

Plate Stud 3/8-in 24 to M8x1

13

Quick disconnect stud

14Adapter, 3/8-in 24 to 1/4-in 20

15Adapter, 3/8-in 24 to 5/16-in 18

16Adapter, 3/8-in 24 to 3/8-in 24

17Adapter, 3/8-in 24 to 3/8-in 16

18Adapter, 3/8-in 24 to 1/2-in 13

19Adapter, 3/8-in 24 to 1/4-in 18
NPT

20Adapter, 3/8-in 24 to 3/8-in 18
NPT

21Adapter, 3/8-in 24 to 1/2-in 14

Description: Connectors: MIL-C 5015, 2 Socket,Splash Proof, Premium, isolated to blunt cut,
Cable: 20 AWG, twisted pair, shielded, yellow
Teflon jacket. LOCKING RING, ADAPTER SEAL,AND O-RING ARE INCLUDED.
A: Length

6/16015

15 feet (4.57 metres)032

32 feet (9.75 metres)

064

64 feet (19.5 metres)

112

112 feet (34.1 metres)

125

125 feet (38.1 metres)

150

150 feet (45.7 metres)

200

200 feet (61.0 metres)

250

250 feet (76.2 metres)

190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

Quick Disconnect Components

Accessories
128608-02

1/2-in NPT conduit adapter

0428402001

Adhesive mount base kit. The
adhesive mount base kit design
is for machines with thin casingsthat do not permit drilling andtapping a mounting hole. Kit
contains material (adhesiveand bases) for 2 each 3/8-in 24
UNF adhesive-mount bases.
One kit can outfit 2 Velomitor CTTransducers.

The following three components are included
with the quick disconnect mounting option forthe Velomitor CT Transducer. The quick
disconnect option allows you to remove thetransducer without rotating it, allowing you tokeep the cable connected to the transducer.
128689-01

3/8-in 24 to 1¾-in 16 quick
disconnect stud base. Attachedto the machine.

43055-01

1¾-in 16 mounting base nut.
Interface between stud baseand transducer piece.

128690-01

3/8-in 24 quick disconnect studtransducer piece. Attached tothe Velomitor CT Transducer.

Spare Mounting Adapters
All mounting adapters are made from 300
series stainless steel.

Standard Studs
04365657

3/8-in 24 to 3/8-in 24 stud87910-01

3/8-in 24 to 1/2-in 20 stud87931-01

M6x1 to M6x1 metric stud(requires metric adapter)

87055-01

3/8-in 24 to M6x1 metric adapter

89139-01

3/8-in 24 to 1/4-in 28 studFittings
Conduit fittings allow connection of flexible,
metal, liquid-tight conduit or armor to the
conduit adapter.

03839201

1/2-in NPT straight male conduit
fitting. For connecting flexible,
liquid-tight conduit to the
conduit adapter or aweatherproof enclosure.

03850000

1/2-in NPT straight, malecompression-type fitting. For
connecting Teflon™-coated
3/8-in stainless steel armor tothe transducer or aweatherproof enclosure. Fitting
will fit Teflon™-coated armor
with a maximum outer diameterof 13.8 mm (0.543 in) (including
Teflon™ thickness).

Hex Plate Studs
107756-01

3/8-in 24 to 3/8-in 24 plate stud107755-01

3/8-in 24 to 1/2-in 20 plate stud107754-01

3/8-in 24 to 1/4-in NPT plate stud107757-01

M6x1 to M6x1 plate stud (requiresmetric adapter)

125094-01

3/8-in 24 to M8x1 metric platestud128038-01

3/8-in 24 to 1/4-in 28 Plate Stud

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190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

Teflon-Coated Stainless SteelArmor
106924-AA
This part includes the Teflon-coatedarmor but not the cable. You will
require 2 1/2-in NPT compression
fittings (part number 03850000) toattach the armor to the conduit
adapter and terminate it at anenclosure.
A: Armor Length Option in Feet
Order in increments of 10 ft (3.0 m)
Minimum Length: 10 ft (3.0 m)
Maximum Length: 60 ft (18.3 m)

Flexible Metal Conduit
14847-AA
A: Flexible Conduit Length Option in Feet
Order in increments of 1 ft (0.3 m)
Minimum Length: 01 ft (0.3 m)
Maximum Length: 99 ft (30.2 m)

106769-01

Terminal housing. Provides aconvenient interface between
the transducer signal cable andmonitor signal cable.

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190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

Graphs and Figures
Note: All dimensions shown are in millimeters (inches) unless noted otherwise.

1.
2.
3.
4.
5.
6.
7.

1/2” NPT x 12.2 DP (1/2” NPT x 0.48 DP)
35.6 (1.40) diameter
Cable (not included)
Conduit adaptor P/N 128608-02 (not included)
31.8 (1.25) hex flat
31.5 (1.24) diameter3/8-24 UNF X 8.9 DP (3/8-24 UNF X 0.35 DP)

Figure 1: Velomitor CT Outline Drawing

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190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

Spare Mounting Adapters
All mounting adapters are made from 300 series stainless steel. Illustrations shown are not toscale.
Table 1: Standard Studs
Part Number

Size04365657

3/8-24 to 3/8-24

87055-01

3/8-24 to M6X1

87910-01

3/8-24 to 1/2-20

87931-01

M6X1 to M6X189139-01

3/8-24 to 1/4-28

Illustration

Table 2: Adhesive Studs
Part Number

Size04284020

3/8-24

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Illustration

190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

Table 3: 1-3/8 Hex Plate Studs
Part Number

Size107754-01

3/8-24 UNF to 1/4 NPT

107755-01

3/8-24 UNF to 1/2-20 UNF

107756-01

3/8-24 to 3/8-24

107757-01

M6X1 to M6X1

125094-01

3/8-24 UNF to M8X1

128038-01

3/8-24 UNF to 1/4-28 UNF

Illustration

Table 4: Quick Disconnect Studs
Part Number

Description

43055-01

Union Mounting Base Nut

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Illustration

190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

Part Number

Description

128689-01

Quick Disconnect Stud Base

128690-01

Quick Disconnect Transducer
Piece

GraphsFigure 2: Typical Phase Response

Figure 3: Typical Amplitude Response

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Illustration

190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

1. Velocity axis (mm/s peak-peak)
2. Displacement axis (mm peak-peak)
3. Acceleration axis (m/s2 peak-peak)Figure 4: Operating Range for Metric Units

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190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

1. Velocity axis (in./s peak-peak)
2. Displacement axis (in. peak-peak)
3. Acceleration axis (g peak-peak)Figure 5: Operating Range for English Units

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190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

Figure 6: Typical Low Frequency Noise Floor

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190501 Velomitor CT Transducer
Datasheet141636 Rev. AD

Copyright 2021 Baker Hughes Company. All rights reserved.

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