Bently Nevada 330425-02-RU Accelerometer 100 mV/g

Bently Nevada 330425-02-RU Accelerometer Transducer

Key Technical Parameters

Temperature sensitivity typically ranges from -11% to +3% across the full operating range. Transverse sensitivity is less than 5% of axial, which minimizes cross-axis measurement errors. The mounted resonant frequency exceeds 30 kHz, and the resonant peak amplitude stays within 20 dB maximum.

Base strain sensitivity depends entirely on the serial number prefix. For units with serial numbers preceded by the letter "G" (including all new sensors), the value is 49 mm/s²/mstrain (0.005 g/mstrain). For older units without the "G" prefix (shipped before April 2004), the sensitivity reaches 980 mm/s²/mstrain (0.100 g/mstrain) without the mounting base. However, with the supplied API adapter base, this value drops to 4.9 mm/s²/mstrain (0.0005 g/mstrain). Therefore, Bently Nevada strongly recommends using the mounting base for older sensors to minimize base strain effects.

Environmental and Power Specifications

The Bently Nevada 330425-02-RU survives extreme operating conditions. Operating and storage temperatures range from -55°C to +121°C (-67°F to +250°F). Shock survivability reaches 49,050 m/s² (5,000 g) peak. Relative humidity can be 100% condensing (non-submerged), and the case is hermetically sealed against moisture ingress.

Magnetic field susceptibility stays below 2.21 mm/s²/gauss (225 mg/gauss) at 50 gauss, 50-60Hz. The IP rating equals IP68 (dust tight and watertight) for the sensor only. Please note that this rating does not apply to the cable. Consequently, you can install this unit in wet or dusty environments without concerns.

For power requirements, the sensor needs -24 ± 0.5 Vdc input voltage with a nominal bias current of 2 mA. Output bias voltage is -8.5 ± 0.5 Vdc. The case is isolated from ground, which effectively helps prevent ground loops. Additionally, the maximum cable length reaches 305 metres (1,000 ft) without any signal degradation.

Mechanical Dimensions and Mounting

The Bently Nevada 330425-02-RU weighs 99 g (3.5 oz) typical without cable. Diameter measures 23 mm (0.93 in). Height, including the mounting stud, is 59 mm (2.3 in). The connector is a 3-pin MIL-C-5015 receptacle made of 316L stainless steel. Case material is also 316L stainless steel, ensuring excellent corrosion resistance for harsh environments.

Mounting surface finish should be 32 minch rms for optimal contact. Apply a mounting torque of 4.1 N·m (3.0 ft·lb) for proper installation. The sensor can be mounted at any orientation, giving you complete flexibility for placement options.

Installation Guidelines

First, prepare the mounting surface to a 32 minch rms finish or better. Next, screw the integral M8 x 1 stud directly into the prepared threaded hole. Use a torque wrench to apply exactly 4.1 N·m. Do not overtighten, as this may damage the sensor or the mounting surface.

For older units without the "G" prefix, always install the Bently Nevada 330425-02-RU with the supplied mounting base (API adapter). This simple step significantly reduces base strain sensitivity. After mounting, connect the 3-pin MIL-C-5015 connector to the compatible cable. Finally, verify the power supply provides -24 Vdc ±0.5 Vdc before powering up the system.

Packaging List

• Bently Nevada 330425-02-RU accelerometer sensor (1 unit)

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

• Mounting base (API adapter) – included with all new units

• Product documentation sheet (quick start guide)

Note: Cables, certificates, and warranty documents are not included in the package.

Shipping

We ship worldwide using FedEx, UPS, or DHL. Tracking numbers are provided after dispatch.

Frequently Asked Questions (FAQ)

1. What is the sensitivity of the Bently Nevada 330425-02-RU?
The sensitivity is 10.2 mV/m/s² (100 mV/g) ±5% , which provides accurate vibration measurements for most industrial rotating machinery applications.

2. Can I use this accelerometer in high-temperature environments?
Yes. The operating temperature range is -55°C to +121°C (-67°F to +250°F) , making it suitable for steam turbines, gas compressors, and large engines.

3. Is the Bently Nevada 330425-02-RU waterproof?
The sensor itself is IP68 rated, meaning dust tight and watertight for non-submerged condensing humidity. However, it is not rated for continuous submersion. Additionally, the cable does not share the same IP68 rating.

4. What is the maximum cable length without signal loss?
The maximum cable length is 305 metres (1,000 ft) without any signal degradation. This allows remote mounting of the signal conditioning electronics away from the measurement point.

5. Do I need the mounting base for all installations?
For sensors with serial numbers preceded by the letter "G" (all new units), the base strain sensitivity is already low at 49 mm/s²/mstrain. For older units without "G", Bently Nevada strongly recommends using the supplied mounting base to reduce base strain sensitivity from 980 to 4.9 mm/s²/mstrain.