Bently Nevada 330400-02-CN Accelerometer Transducer

Bently Nevada 330400-02-CN Accelerometer Acceleration Transducer

Product Introduction

The Bently Nevada 330400-02-CN is a rugged acceleration transducer engineered for reliable vibration measurement on a wide range of industrial machinery. This model features an M8 x 1 integral stud for straightforward mounting onto the measurement surface. The 330400-02-CN delivers a sensitivity of 10.2 mV/m/s² (100 mV/g) with an acceleration range of 490 m/s² (50 g) peak.

Furthermore, this accelerometer offers excellent frequency response from 10 Hz to 15 kHz, making it suitable for detecting both low-frequency machine vibrations and higher-frequency events. Its 316L stainless steel case is hermetically sealed, providing protection against moisture and contaminants. The Bently Nevada 330400-02-CN is an ideal choice for permanent installation in condition monitoring systems.

Technical Specifications

Performance and Electrical Parameters
The Bently Nevada 330400-02-CN offers an amplitude linearity of ±1% up to 490 m/s² (50 g) peak. Its broadband noise floor from 10 Hz to 15 kHz is 0.039 m/s² (0.004 g) rms, ensuring clear signal acquisition. The mounted resonant frequency exceeds 30 kHz with a maximum resonant peak amplitude of 20 dB. The transverse sensitivity is less than 5% of the axial sensitivity, minimizing measurement errors from off-axis vibrations.

For power requirements, the 330400-02-CN operates with an input voltage of -24 ± 0.5 Vdc and a bias current of 2 mA nominal. The output bias voltage is -8.5 ± 0.5 Vdc, and the case is isolated for grounding flexibility. Additionally, the maximum cable length is 305 metres (1000 ft) without signal degradation.

Base Strain Sensitivity
For sensors with serial numbers preceded by the letter "G" (including all new sensors), the base strain sensitivity is 49 mm/s²/mstrain (0.005 g/mstrain). For units with serial numbers NOT preceded by "G" (shipped prior to April 2004), the sensitivity is 980 mm/s²/mstrain without the Mounting Base, but reduces to 4.9 mm/s²/mstrain when using the supplied Mounting Base (API adapter). Therefore, Bently Nevada recommends using the Mounting Base for optimal performance on older units.

Environmental and Mechanical Specifications

Operating Conditions and Durability
This accelerometer operates and stores within a temperature range of -55°C to +121°C (-67°F to +250°F). It can withstand shock survivability up to 49,050 m/s² (5000 g) peak, making it highly durable in demanding applications. The relative humidity rating is 100% condensing (non-submerged), and the case is hermetically sealed to prevent internal damage.

Physical Dimensions and Mounting
The Bently Nevada 330400-02-CN weighs approximately 100 g (3.5 oz) without cable, with a diameter of 23 mm (0.93 in) and a height of 59 mm (2.3 in) including the mounting stud. The connector is a 3-pin MIL-C-5015 receptacle made from 316L stainless steel. The mounting surface should be 32 minch rms, and the recommended mounting torque is 4.1 N·m (3.0 ft·lb). The case material is 316L stainless steel, and the sensor can be mounted at any orientation.

Installation Guidelines

Mounting and Cabling
Installing the 330400-02-CN requires a clean mounting surface with a finish of 32 minch rms. First, apply a thin layer of coupling grease to the mounting stud for optimal acoustic coupling. Then, thread the M8 x 1 integral stud into the prepared mounting hole and tighten to 4.1 N·m using a torque wrench. Finally, connect the 3-pin MIL-C-5015 connector and secure the cable to prevent strain.

Cable Length Considerations
The accelerometer supports a maximum cable length of 305 metres (1000 ft) with no signal degradation. For applications requiring longer runs, consider using a signal conditioner to maintain signal integrity. Meanwhile, ensure the cable is properly routed and protected from mechanical damage or excessive heat sources.

Packaging List

• 1x Bently Nevada 330400-02-CN Accelerometer Acceleration Transducer

• 1x M8 x 1 Integral Mounting Stud (Installed)

• 1x Mounting Base (API Adapter) - For units with older serial numbers

FAQ

Q1: What is the sensitivity of this accelerometer?
A: The Bently Nevada 330400-02-CN has a sensitivity of 10.2 mV/m/s² (100 mV/g) with a tolerance of ±5%.

Q2: What is the frequency response range?
A: The accelerometer provides a frequency response of 10 Hz to 15 kHz at ±3dB, and 30 Hz to 10 kHz at ±10%.

Q3: What type of mounting stud does this model have?
A: The 330400-02-CN features an M8 x 1 integral stud for secure mounting.

Q4: Is this accelerometer suitable for outdoor use?
A: Yes, the sensor is hermetically sealed and has an IP68 equivalent rating (dust tight and watertight). However, this rating applies to the sensor only, not the cable.

Q5: What is the maximum cable length supported?
A: The accelerometer supports a maximum cable length of 305 metres (1000 feet) without signal degradation.