Page 1
330400 and 330425 Accelerometer
Acceleration Transducers
Datasheet
Bently Nevada Machinery Condition Monitoring
Description
These accelerometers are intended for critical machinery
applications where casing acceleration measurements are
required, 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.
If housing measurements are being made for overall
protection of the machine, thought should be given to
the usefulness of the measurement for each
application. Most common machine malfunctions
(imbalance, misalignment, etc.) originate at the rotor
and cause an increase (or at least a change) in rotor
vibration. In order for any housing measurement
alone to be effective for overall machine protection, a
significant amount of rotor vibration must be faithfully
transmitted to the bearing housing or machine
casing, or more specifically, to the mounting location
of the transducer.
141638 Rev. Y
In addition, care should be exercised in the physical
installation of the transducer. Improper installation can result
in a degradation of the transducer’s performance, and/ or
the generation of signals which do not represent actual
machine vibration. Integration of the output to velocity can
worsen this. Extreme caution should be exercised if
integrating to velocity. For high quality velocity
measurements the 330500 Velomitor Sensor should be used.
Upon request, we can provide engineering services to
determine the appropriateness of housing measurements for
the machine in question and/or to provide installation
assistance.
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330400 and 330425 Accelerometer Acceleration Transducers
Datasheet 141638 Rev. Y
Both Units
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 or loss of machine
monitoring.
Electrical
330400
Sensitivity
Acceleration
range
Amplitude
Linearity
Broadband
Noise Floor
(10 Hz to 15
kHz)
10.2 mV/m/s2 (100 mV/g) ±5%.
490 m/s2 (50 g) peak overall
acceleration within the 10 Hz to 15 kHz
frequency span. Vibration at
frequencies above 15 kHz, especially
at the transducers resonance will
significantly decrease this range.
±1% to 490 m/ s2 (50 g) peak.
0.039 m/s2 (0.004 g) rms.
10 Hz to 15 kHz
Frequency
Response
Temperature
Sensitivity
Transverse
Sensitivity
Mounted
Resonant
Frequency
Amplitude of
Resonant
Peak
Base Strain Sensitivity
For serial
numbers
preceded by
the letter “G”
(including all
new sensors
(600 cpm to 900,000 cpm) ±3dB;
30 Hz to 10 kHz
(1800 cpm to 600,000 cpm) ±10%
-11% to +3% typical over the
operating temperature range.
Less than 5% of axial.
Greater than 30 kHz.
20 dB maximum.
49 mm/s2/mstrain (0.005
g/mstrain)
980 mm/s2/mstrain (0.100
g/mstrain) without Mounting Base
(API adapter);
330425
Sensitivity
Acceleration
Range
Amplitude
Linearity
Broadband
Noise Floor
(10 Hz to 15
kHz)
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. Vibration at
frequencies above 15 kHz, especially
at the transducer’s resonance, will
significantly decrease this range.
±1% to 735 m/s2 (75 g) peak.
0.098 m/s2 (0.01 g) rms.
For serial
numbers NOT
preceded by
the letter “G”
(shipped prior
to April 2004)
Maximum
cable length
Power requirements
Input Voltage -24 ± 0.5 Vdc.
Bias Current 2 mA nominal.
Output Bias
Voltage:
Grounding Case isolated.
4.9 mm/s2/mstrain (0.0005
g/mstrain) with Mounting Base (API
adapter) supplied with the
accelerometer.
Bently Nevada recommends
installing with the Mounting
base to minimize base strain
sensitivity for serial numbers
NOT preceded by the letter
“G”.
305 metres (1000 ft) with no
degradation of signal.
-8.5 ± 0.5 Vdc.
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Page 3
330400 and 330425 Accelerometer Acceleration Transducers
Datasheet 141638 Rev. Y
Environmental Limits
Operating
and storage
temperature
Shock
Survivability
Relative
humidity
Magnetic
Field
Susceptibility
IP Rating
-55°C to +121°C (-67°F to +250°F)
49,050 m/s2 (5000 g) peak,
maximum.
100% condensing, non-submerged.
Case is hermetically sealed.
<2.21 mm/s2/gauss (225 mg/gauss)
[50 gauss, 50-60Hz].
Equivalent to an IP 68 (Dust tight and
watertight). Please note that this is
for the sensor only and does not
apply to the cable.
Physical
Weight (no
cable)
Diameter 23 mm (0.93 in).
Height
Connector
Mounting
Surface
Mounting
Torque
Case Material 316L stainless steel
Weight (no
cable)
Mounting
Angle
99 g (3.5 oz), typical
59 mm (2.3 in), including mounting
stud.
3-pin MIL-C-5015 Receptacle
316L stainless steel
32 minch rms.
4.1 N·m (3.0 ft·lb).
100 g (3.5 oz), typical
Any orientation
3/9
Page 4
330400 and 330425 Accelerometer Acceleration Transducers
Datasheet 141638 Rev. Y
Install per drawing 167536
Compliance and Certifications
FCC
This device complies with part 15 of the
FCC Rules. Operation is subject to the
following two conditions:
l This device may not cause harmful
interference.
l This device must accept any
interference received, including
interference that may cause
undesired operation.
EMC
EMC Directive 2014/30/EU
RoHS
RoHS Directive 2011/65/EU
Maritime
330400and 330425 only
ABS 2009 Steel Vessels Rules
1-1-4/7.7,4-8-3/1.11.1,4-9-7/13
Hazardous Area Approvals
For the detailed listing of country and product
specific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from
Bently.com.
CSA/NRTL/C
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
Intrinsically
Safe
Class III
AEx ia IIC T4:
Class I, Div 1, Groups A, B, C, D;
Class II, Groups E, F, G
Class III
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
Intrinsically
Safe and
NonIncendive
330400,
330425
330500
330525
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)
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
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
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
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
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
ATEX/IECEx
190501, 330400, 330425, 330500, 330525
190501
II 1 G
4/9
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330400 and 330425 Accelerometer Acceleration Transducers
Datasheet 141638 Rev. Y
Ex ia IIC T4 Ga
Hazardous Area Conditions of
II 3 D
Entity Parameters
330400,
330425,
330500,
330525
Entity Parameters
Ex na IIC T4 Gc
Ex tc III T130°C Dc
T4@ Ta = -55°C to 121°C
Zone 0/1 Zone 2
Ui= 30V Ui= 30V
Ii= 200mA Ii= 200mA
Pi= 0.75W Pi= 1.14W
Ci-27.2nF
Li= 0
II 1 G
Ex ia IIC T4 Ga
II 3 D
Ex na IIC T4 Gc
Ex tc III 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
Safe Use
ATEX/IECEx
Zone 0/1:
Equipment must be connected to equipment,
which meets the abovelisted entity parameters.
The cables type A or B (in compliance with EN
60079-25) must respect the cable parameters
listed with the entity parameters.
Zone 2 :
The supply electrical parameters shall not
exceed the values mentioned in the tables
above.
Li= 0
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Page 6
330400 and 330425 Accelerometer Acceleration Transducers
Datasheet 141638 Rev. Y
3-conductor shielded 18 AWG (1.0
Ordering Information
For the detailed listing of country and product
specific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from
Bently.com.
330400 Accelerometer
330425 Accelerometer
Part Number-AA-BB
A: Mounting Thread Option
0 1 ¼-28 UNF integral stud
0 2 M8 X 1 integral stud
B: Agency Approval Option
0 0 None
0 5 Multiple approvals (CSA, ATEX, IECEx,)
Interconnect Cables
Part Number-AA
A: Cable Length Option in feet
Examples:
1 5 = 15 ft (4.57 m)
2 0 = 20 ft (6.10 m)
The following are standard lengths
Feet Metres (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
50 15.2
99 30.0
For the cables listed below, order in
increments of 1.0 ft (305 mm).
130539
16925
16710
Accessories
127088
00531080
37439-01
37439-02
43217
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).
3-conductor shielded 22 AWG (0.5
mm2) cable with 3-socket plug 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).
3-conductor shielded 22 AWG (0.5
mm2) armored cable with 3-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).
330400 and 330425 Accelerometer
User Guide
Mating connector for 330400 and
330425 Accelerometers.
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 part number
108576-01 and O-ring part number
04290422 to allow room for the
330400 or 330425 accelerometer.
(See separate datasheet, document
141630.)
Non-standard/custom lengths can also
be ordered at additional cost.
Cable Part Numbers
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330400 and 330425 Accelerometer Acceleration Transducers
Datasheet 141638 Rev. Y
Graphs and Figures
Figure 1: Acceleration Transducer Dimensional Drawing
Dimensions are in millimetres (inches)
7/9
Page 8
330400 and 330425 Accelerometer Acceleration Transducers
Datasheet 141638 Rev. Y
Figure 2: Typical Amplitude Response
Figure 3: 10 – 10,000 Hz Typical Amplitude Response Detail
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330400 and 330425 Accelerometer Acceleration Transducers
Datasheet 141638 Rev. Y
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notice or obligation. Contact your Baker Hughes representative for the most current information.
The information contained in this document is the property of BakerHughes and its affiliates; and is subject to
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1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 or 1.800.227.5514 (US only)
Bently.com
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