Bently Nevada 330400-01-CN Accelerometer Transducer

Bently Nevada 330400-01-CN Accelerometer Acceleration Transducer

Product Introduction

The Bently Nevada 330400-01-CN is a high-quality acceleration transducer built for precision vibration measurement on rotating and reciprocating machinery. This model comes with a ¼-28 UNF integral stud, providing a secure and straightforward mounting solution. The 330400-01-CN delivers a sensitivity of 10.2 mV/m/s² (100 mV/g) with an acceleration range of 490 m/s² (50 g) peak.

Moreover, this accelerometer offers a broad frequency response from 10 Hz to 15 kHz, making it suitable for detecting a wide spectrum of vibration signatures. Its 316L stainless steel case is hermetically sealed and carries an IP68 equivalent rating, ensuring protection against dust and moisture ingress. The Bently Nevada 330400-01-CN is an excellent choice for permanent installation in predictive maintenance and machine protection systems.

Technical Specifications

Performance and Electrical Parameters
The Bently Nevada 330400-01-CN provides an amplitude linearity of ±1% up to 490 m/s² (50 g) peak. Its broadband noise floor from 10 Hz to 15 kHz measures 0.039 m/s² (0.004 g) rms, which ensures clear and accurate signal acquisition. The mounted resonant frequency exceeds 30 kHz with a maximum resonant peak amplitude of 20 dB. Additionally, the transverse sensitivity is less than 5% of the axial sensitivity, effectively minimizing measurement errors from off-axis vibrations.

For power requirements, the 330400-01-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 to provide grounding flexibility. Furthermore, the maximum cable length is 305 metres (1000 ft) without any 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. However, this reduces to 4.9 mm/s²/mstrain when using the supplied Mounting Base (API adapter). Therefore, Bently Nevada strongly recommends using the Mounting Base for optimal performance on older units.

Environmental and Mechanical Specifications

Operating Conditions and Durability
This accelerometer operates and stores safely within a temperature range of -55°C to +121°C (-67°F to +250°F). It withstands shock survivability up to 49,050 m/s² (5000 g) peak, demonstrating exceptional durability in demanding applications. The relative humidity rating is 100% condensing (non-submerged), and the case is hermetically sealed to protect internal components. The magnetic field susceptibility is less than 2.21 mm/s²/gauss (225 mg/gauss) at 50 gauss, 50-60Hz.

Physical Dimensions and Mounting
The Bently Nevada 330400-01-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 recommended mounting surface finish is 32 minch rms, and the 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 Procedure
Installing the 330400-01-CN requires proper surface preparation and torque application. First, clean the mounting surface to achieve a finish of 32 minch rms for optimal acoustic coupling. Then, apply a thin layer of coupling grease to the ¼-28 UNF stud to enhance signal transmission. Finally, thread the integral stud into the prepared hole and tighten it to 4.1 N·m using a calibrated torque wrench.

Cable and Connection
After mounting, connect the 3-pin MIL-C-5015 connector securely to the sensor. The maximum cable length is 305 metres (1000 ft) without signal degradation. Meanwhile, ensure the cable is properly routed away from heat sources and mechanical hazards to prevent damage. For older units without the "G" serial number prefix, Bently Nevada recommends installing the supplied Mounting Base to minimize base strain sensitivity.

Packaging List

• 1x Bently Nevada 330400-01-CN Accelerometer Acceleration Transducer

• 1x ¼-28 UNF Integral Mounting Stud (Installed)

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

FAQ

Q1: What is the sensitivity of this accelerometer?
A: The Bently Nevada 330400-01-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: This 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 330400-01-CN features a ¼-28 UNF integral stud for secure and easy mounting.

Q4: Is this accelerometer suitable for outdoor or wet environments?
A: Yes, the sensor is hermetically sealed and has an IP68 equivalent rating (dust tight and watertight). Please note 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.