330400 and 330425 Accelerometer
Acceleration Transducers
Datasheet

Bently Nevada Machinery Condition Monitoring141638 Rev. AA

Description
These accelerometers are intended for critical machinery
applications where casing acceleration measurements arerequired, such as gear mesh monitoring. The 330400 is
designed to address the requirements of American
Petroleum Institute Standard 670 for accelerometers. It
provides an amplitude range of 50 g peak and a sensitivity of
100 mV/g. The 330425 is identical except it provides a larger
amplitude range (75 g peak) and a sensitivity of 25 mV/g.
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
housing measurements and installation assistanceif needed.

330400 and 330425 Accelerometer Acceleration Transducers
Datasheet

Broadband
Noise Floor(10 Hz to 15kHz)

Specifications
Parameters are specified from +20 to +30 °C(+68 to +86 °F) and 100 Hz unless otherwise
indicated.
Operation outside the specified
limits may result in false readings orloss of machine monitoring.

Electrical
330400Sensitivity

10.2 mV/m/s2 (100 mV/g) ±5%.

490 m/s2 (50 g) peak overall
acceleration within the 10 Hz to15 kHz frequency span.
Acceleration Vibration at frequencies aboverange
15 kHz, especially at thetransducers resonance will
significantly decrease thisrange.
Amplitude
Linearity±1% to 490 m/ s2 (50 g) peak.

Broadband
Noise Floor(10 Hz to 15kHz)

0.039 m/s2 (0.004 g) rms.

330425
Sensitivity

2.5 mV/m/s2 (25 mV/g) ±5%.

735 m/s2 (75 g) peak overall
acceleration within the 10 Hz to
15 kHz frequency span.
Acceleration Vibration at frequencies aboveRange
15 kHz, especially at thetransducer’s resonance, will
significantly decrease thisrange.
Amplitude
Linearity

141638 Rev. AA±1% to 735 m/s2 (75 g) peak.

2/11

0.098 m/s2 (0.01 g) rms.

330400 and 330425 Accelerometer Acceleration Transducers
Datasheet141638 Rev. AA

Both Units

980 mm/s2/mstrain (0.100g/mstrain) without Mounting
Base (API adapter);

10 Hz to 15 kHz

FrequencyResponse(600 cpm to 900,000 cpm)
±3dB;

For serialnumbersNOTpreceded bythe letter “G”(shippedprior to April2004)

30 Hz to 10 kHz(1800 cpm to 600,000 cpm)
±10%Temperature -11% to +3% typical over theSensitivity
operating temperature range.
Transverse
Sensitivity

Less than 5% of axial.

MountedResonant
Frequency

Greater than 30 kHz.
Maximum
cable length

Amplitude ofResonant
20 dB maximum.
Peak

4.9 mm/s2/mstrain (0.0005g/mstrain) with Mounting Base(API adapter) supplied with theaccelerometer.
For units bearing
serial numbers NOT
preceded by theletter “G”, Bently
Nevadarecommendsinstalling with theMounting Base tominimize base strain
sensitivity.
305 metres (1000 ft) with nodegradation of signal.

Power requirements

Base Strain Sensitivity
For serial
numbers
preceded by 49 mm/s2/mstrain (0.005
the letter “G” g/mstrain)(including all
new sensors

3/11

Input
Voltage-24 ± 0.5 Vdc.

Bias Current

2 mA nominal.

Output Bias
Voltage:-8.5 ± 0.5 Vdc.

GroundingCase isolated.

330400 and 330425 Accelerometer Acceleration Transducers
Datasheet

Environmental Limits
Operatingand storage
temperature-55°C to +121°C (-67°F to+250°F)ShockSurvivability

49,050 m/s2 (5000 g) peak,maximum.

Relativehumidity

100% condensing, nonsubmerged. Case ishermetically sealed.

Magnetic<2.21 mm/s2/gauss (225Fieldmg/gauss) [50 gauss, 50Susceptibility 60Hz].

IP Rating

Equivalent to an IP 68 (Dusttight and watertight). Please
note that this is for the sensor
only and does not apply to thecable.

Physical
Weight (nocable)

99 g (3.5 oz), typical

Diameter

23 mm (0.93 in).

Height59 mm (2.3 in), including
mounting stud.

Connector

3-pin MIL-C-5015 Receptacle
316L stainless steel

Mounting
Surface32 minch rms.

Mounting
Torque4.1 N·m (3.0 ft·lb).

CaseMaterial

316L stainless steel

Weight (nocable)

100 g (3.5 oz), typical

Mounting
Angle

Any orientation

4/11141638 Rev. AA

330400 and 330425 Accelerometer Acceleration Transducers
Datasheet141638 Rev. AA
330500Compliance andCertifications
Hazardous Area Approvals

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

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

Install per dwg 167537
T4 @ -40°C ≤ Ta ≤ 100°C

330525

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 IIIEx 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

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, 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, Division 1, Groups A, B, C and D
Class II, Groups E, F, G
Class III
T4 @ -40°C ≤ Ta ≤ 100°C

AEx ia IIC T4:
Class I, Div 1, Groups A, B, C, D;
Class II, Groups E, F, G
Class III

Intrinsically
Safe andNonIncendive

Ex 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, 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

5/11

330400 and 330425 Accelerometer Acceleration Transducers
Datasheet141638 Rev. AA

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= 06/11

330400 and 330425 Accelerometer Acceleration Transducers
Datasheet

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

330400 Accelerometer

141638 Rev. AA154.5

175.020

6.0

25

7.650

15.29930.0330425 Accelerometer

Non-standard/custom lengths
can also be ordered at additional
cost.

Part Number-AA-BB
A: Mounting Thread Option
01¼-28 UNF integral stud

02

M8 X 1 integral stud

Cable Part Numbers

1305393-conductor shielded 18 AWG(1.0 mm2) cable with 3-socket
plug and fluorosilicone
elastomer boot at one end,
terminal lugs at the other end.
Minimum length of 2.0 ft (0.6 m),
maximum length of 99 ft (30 m).
A manual is available to assist
with installation of this cable(part number 133080-01).

16925

3-conductor shielded 22 AWG(0.5 mm2) cable with 3-socket
plug at one end, terminal lugs atthe other end. Minimum lengthof 2.0 ft (0.6 m), maximum
length of 99 ft (30 m).

16710

3-conductor shielded 22 AWG(0.5 mm2) armored cable with3-socket plug 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).

B: Agency Approval Option00

None05Multiple approvals (CSA, ATEX,IECEx,)

Interconnect Cables
Part Number-AA
A:

Cable Length Option in feet
For the cables listed below, orderin increments of 1.0 ft (305 mm).

Examples:1 5 = 15 ft (4.57 m)
2 0 = 20 ft (6.10 m)
The following are standard lengths
FeetMetres (approx.)

6

1.8

8

2.4

10

3.0

12

3.6

Accessories

7/11

127088330400 and 330425
Accelerometer User Guide00531080

Mating connector for 330400
and 330425 Accelerometers.

330400 and 330425 Accelerometer Acceleration Transducers
Datasheet37439-01

37439-02

43217

For use with serial numbers NOT
preceded with the letter “G”.
Mounting Base, ¼-28 to ¼-28.
Reduces base strain sensitivity.
For use with serial numbers NOT
preceded with the letter “G”.
Mounting Base, M8X1 to M8X1.
Reduces base strain sensitivity.
Accelerometer Mounting Kit
used with extension partnumber 108576-01 and O-ringpart number 04290422 to allow
room for the 330400 or 330425
accelerometer.
(See separate datasheet,document 141630.)

8/11141638 Rev. AA

330400 and 330425 Accelerometer Acceleration Transducers
Datasheet

Graphs and Figures

Figure 1: Acceleration Transducer Dimensional Drawing
Dimensions are in millimetres (inches)

9/11141638 Rev. AA

330400 and 330425 Accelerometer Acceleration Transducers
Datasheet

Figure 2: Typical Amplitude Response

Figure 3: 10 – 10,000 Hz Typical Amplitude Response Detail10/11141638 Rev. AA

330400 and 330425 Accelerometer Acceleration Transducers
Datasheet141638 Rev. AA

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