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330400/330425 Accelerometers

Accelerometer

The 330400 accelerometer is designed for general-purpose casing acceleration measurements and meets all requirements of API 670. The 330425 is identical except it provides a broader amplitude range (75 g peak) and a sensitivity of 25 mV/g peak. Neither transducer requires an external interface module.

 

 

 

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Specifications

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

Note: Operation outside the specified limits may result in false readings or loss of machine monitoring.

Electrical

330400

Sensitivity 10.2 mV/m/s2 (100 mV/g) ±5%.
Acceleration range 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.
Amplitude Linearity ±1% to 490 m/ s2 (50 g) peak.
Broadband Noise Floor (10 Hz to 15 kHz) 0.039 m/s2 (0.004 g) rms.

330425

Sensitivity 2.5 mV/m/s2 (25 mV/g) ±5%.
Acceleration Range 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.
Amplitude Linearity ±1% to 735 m/s2 (75 g) peak.
Broadband Noise Floor (10 Hz to 15 kHz) 0.098 m/s2 (0.01 g) rms.

Both Units

Frequency Response 10 Hz to 15 kHz(600 cpm to 900,000 cpm) ±3dB;
30 Hz to 10 kHz (1800 cpm to 600,000 cpm) ±10%
Temperature Sensitivity -11% to +3% typical over the operating temperature range.
Transverse Sensitivity Less than 5% of axial.
Mounted Resonant Frequency Greater than 30 kHz.
Amplitude of Resonant Peak 20 dB maximum.
Base Strain Sensitivity
For serial numbers
preceded by the letter “G” (including all new sensors)
49 mm/s2/μstrain (0.005 g/μstrain)
For serial numbers
NOT preceded by the letter “G” (shipped prior to April 2004)
980 mm/s2/μstrain (0.100 g/μstrain) without Mounting Base (API adapter);
4.9 mm/s2/μstrain (0.0005 g/μstrain) with Mounting Base (API adapter) supplied with the accelerometer.
Note: Bently Nevada recommends installing with the Mounting base to minimize base strain sensitivity for serial numbers NOT preceded by the letter “G”.
Maximum cable length 305 metres (1000 ft) with no degradation of signal.

Power requirements

Input Voltage -24 ± 0.5 Vdc.
Bias Current 2 mA nominal
Output Bias Voltage -8.5 ± 0.5 Vdc.
Grounding Case isolated.

Hazardous Area Approvals

Multiple approvals for hazardous areas certified by Canadian Standards Association (CSA) in North America and by LCIE in Europe.

North America Ex ia IIC T4
AEx ia IIC T4
Class I, Div 1 Groups A, B, C & D
When installed per dwg 167538
T4 @ -40°C ≤ Ta ≤ 100°C
Ex nL IIC T4
AEx nL IIC T4
Class I, Div 2 Groups A, B, C & D
When installed per dwg 167538
T4 @ -40°C ≤ Ta ≤ 100°C
European/ATEX Ex II 1 G
EEx ia IIC T4
LCIE 04ATEX6042X
T4 @ -40°C ≤ Ta ≤ 100°C
Ex II 3 G
EEx nL IIC T4
LCIE 04ATEX6041X
T4 @ -40°C ≤ Ta ≤ 100°C
IECEx Ex ia IIC T4
IEC Ex LCI 06.0003X
Ex nL IIC T4
IEC Ex LCI 06.0002X
T4 @ -40°C ≤ Ta ≤ 100°C
Brazil BR-Ex ia IIC T4
MC, AEX-8101-X
T4 @ -40°C ≤ Ta ≤ 100°C

Compliance and Certification

American Bureau of Shipping (ABS) Type approval Certification Number:
09-HS446965A-PDA

Electromagnetic Compatibility

Electrostatic discharge EN 61000-4-2 (1999), Criteria B.
Electrical fast transients EN 61000-4-4 (1999), Criteria B.
Radiated Susceptibility EN 61000-4-3, Criteria A.
Conducted Susceptibility EN 61000-4-6, Criteria A.
Surge Capability EN 61000-4-5, Criteria B.
Magnetic Field EN 61000-4-8, Criteria A.

Environmental Limits

Operating and storage temperature -55°C to +121°C (-67°F to +250°F)
Shock Survivability 49,050 m/s2 (5000 g) peak, maximum.
Relative humidity 100% condensing, nonsubmerged. Case is hermetically sealed.
Magnetic Field Susceptibility <2.21 mm/s2/gauss (225 μg/gauss) [50 gauss, 50-60Hz].

Physical

Weight (no cable) 99 g (3.5 oz), typical
Diameter 23 mm (0.93 in).
Height 59 mm (2.3 in), including mounting stud.
Connector 3-pin MIL-C-5015 Receptacle
Mounting Surface 32 μinch rms.
Mounting torque 4.1 N•m (3.0 ft•lb).
Case material 304L stainless steel
Weight (no cable) 100 g (3.5 oz), typical
Mounting angle Any orientation

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Descriptions English
330400/330425 Accelerometers Datasheet acrobat-reader
Housings for Proximitor Sensors and Interface Modules acrobat-reader
ORBIT 330400/330425 Accelerometers acrobat-reader


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