Bently Nevada 330400-02-RU Accelerometer 100 mV/g

Bently Nevada 330400-02-RU Accelerometer Transducer

Why Choose This Vibration Sensor for Your Machinery Protection

The Bently Nevada 330400-02-RU provides reliable vibration data for rotating machinery. You can use it on turbines, compressors, pumps, and fans. This sensor helps you detect early bearing faults, unbalance, and misalignment. Its hermetically sealed case ensures stable performance in condensing humidity. Moreover, the IP68 rating makes it dust-tight and watertight for demanding industrial sites.

Key Technical Specifications You Need to Know

Sensitivity stands at 10.2 mV/m/s² (100 mV/g) ±5%. This value remains consistent across the operating range.
Acceleration range reaches 490 m/s² (50 g) peak within 10 Hz to 15 kHz.
Amplitude linearity stays within ±1% up to 490 m/s² (50 g) peak.
Broadband noise floor measures only 0.039 m/s² (0.004 g) rms from 10 Hz to 15 kHz.
Frequency response spans 10 Hz to 15 kHz (600 to 900,000 cpm) at ±3dB.
Additionally, from 30 Hz to 10 kHz (1,800 to 600,000 cpm) you get ±10% accuracy.
Temperature sensitivity typically varies from -11% to +3% over the full operating range.
Transverse sensitivity remains less than 5% of axial measurement.
Mounted resonant frequency exceeds 30 kHz with a resonant peak of 20 dB maximum.

Base Strain and Cable Length Considerations

For units with serial numbers preceded by the letter “G” (all new sensors after April 2004), base strain sensitivity equals 49 mm/s²/mstrain (0.005 g/mstrain). For older serial numbers NOT preceded by “G”, sensitivity without the mounting base is 980 mm/s²/mstrain (0.100 g/mstrain). However, if you install the original mounting base (API adapter), it drops to 4.9 mm/s²/mstrain (0.0005 g/mstrain). Bently Nevada strongly recommends using the mounting base with older units.
Maximum cable length reaches 305 metres (1000 ft) without signal degradation.

Power Requirements and Electrical Data

Input voltage requires -24 ± 0.5 Vdc. Bias current is 2 mA nominal. Output bias voltage measures -8.5 ± 0.5 Vdc. The case is isolated from ground to avoid ground loops. Therefore you can install it on grounded structures without interference.

Environmental Limits for Reliable Field Use

Operating and storage temperature ranges from -55°C to +121°C (-67°F to +250°F). Shock survivability reaches 49,050 m/s² (5000 g) peak. Relative humidity allows 100% condensing, non-submerged conditions because the case is hermetically sealed. Magnetic field susceptibility stays below 2.21 mm/s²/gauss (225 mg/gauss) at 50 gauss, 50-60Hz. The IP rating equals IP68, meaning total dust ingress protection and continuous water immersion resistance. Please note this rating applies to the sensor only, not the cable.

Mechanical Installation Guidelines

Weight without cable is typically 99 g (3.5 oz). Diameter measures 23 mm (0.93 in). Height reaches 59 mm (2.3 in) including the mounting stud. The connector is a 3-pin MIL-C-5015 receptacle made of 316L stainless steel. Mounting surface finish requires 32 minch rms. Mounting torque must be 4.1 N·m (3.0 ft·lb). Case material is also 316L stainless steel. You can mount the 330400-02-RU in any orientation, which gives you flexible installation options.

Step-by-Step Mounting Advice

First, prepare a flat mounting surface with the recommended 32 minch rms finish.
Next, clean the M8 x 1 integral stud and the mating hole.
Then apply the specified torque of 4.1 N·m (3.0 ft·lb). Do not overtighten.
Finally, connect the cable to the 3-pin MIL-C-5015 receptacle. Use a locking mechanism if available.
For best accuracy, avoid mounting on thin or flexible brackets. Besides, keep the cable away from high-temperature sources above 121°C.

Shipping and Delivery Options

All orders ship via Fedex, UPS, or DHL. You will receive a tracking number within 24 hours after dispatch. International delivery typically takes 3 to 7 business days.

Packaging List

• Bently Nevada 330400-02-RU accelerometer sensor (1 unit)

• M8 x 1 integral mounting stud (pre-installed)

• 3-pin MIL-C-5015 mating connector (receptacle only)

• Installation sheet (quick reference)

Note: No calibration certificates or warranty documents are included in the package.

Frequently Asked Questions (FAQ)

1. Can I use the 330400-02-RU on a variable frequency drive (VFD) motor?
Yes, you can. The case is isolated, which reduces electrical noise pickup. Additionally, the noise floor is very low at 0.039 m/s² rms. However, always use a shielded cable and proper grounding for best results.

2. What happens if I exceed the 490 m/s² (50 g) acceleration range?
The sensor may still survive brief overloads up to 5,000 g shock. But continuous operation above 50 g peak can degrade linearity and cause inaccurate readings. Besides, high-frequency vibrations above 15 kHz reduce the usable range significantly.

3. How do I identify if my sensor has the lower base strain sensitivity?
Check the serial number. If it starts with the letter “G”, you already have the improved 49 mm/s²/mstrain specification. If not preceded by “G”, use the supplied mounting base to achieve 4.9 mm/s²/mstrain. The 330400-02-RU units shipped after April 2004 all have the “G” prefix.

4. Is this accelerometer approved for use in hazardous areas?
No, the 330400-02-RU has the “RU” agency approval option for country-specific Russian standards, not for explosive atmospheres. For hazardous locations, please select other agency options from Bently Nevada.

5. What is the expected lifespan of this sensor at 100°C?
Typically 5 to 8 years under continuous operation at 100°C. The hermetically sealed 316L stainless steel case protects internal components. Nevertheless, annual sensitivity checks are recommended for critical machinery.