Bently 330400 and 330425 acceleration sensors



Bently 330400 and 330425 acceleration sensors

Product Overview

1. Core purpose and design objectives

The 330400 and 330425 acceleration sensors are designed specifically for measuring the acceleration of critical machinery casings, especially suitable for scenarios such as gear meshing monitoring. Both comply with the American Petroleum Institute API 670 standard, with the main differences being range and sensitivity:

330400: Range of 50 g peak, sensitivity of 100 mV/g, suitable for monitoring moderate vibration intensity.

330425: Larger range (75 g peak), sensitivity of 25 mV/g, suitable for high vibration intensity scenarios.

2. Application precautions

The sensor needs to be installed on the bearing seat or casing to ensure that the rotor vibration can be effectively transmitted to the installation position, otherwise it may cause measurement signal attenuation or distortion.

Improper installation can affect amplitude and frequency response. It is recommended to refer to the accompanying manual and application guide, and if necessary, apply for Bently Nevada's engineering services to determine the best installation solution.

Detailed explanation of technical specifications

Electrical performance parameters

Parameters: 330400 detailed specifications/330425 detailed specifications

Sensitivity: 10.2 mV/m/s ² (100 mV/g), with an error of ± 5%, calibrated at 20-30 ° C and 100Hz/2.5 mV/m/s ² (25 mV/g), with an error of ± 5%, under the same calibration conditions

Acceleration range: 490 m/s ² (50 g) peak, only valid within the frequency range of 10 Hz-15 kHz; A frequency above 15 kHz (especially the resonance point) will significantly reduce the range/735 m/s ² (75 g) peak, and the range limit is consistent with 330400

Amplitude linearity: ± 1% (when acceleration ≤ 490 m/s ² peak)/± 1% (when acceleration ≤ 735 m/s ² peak)

Broadband noise base: 0.039 m/s ² (0.004 g) rms, frequency range 10 Hz-15 kHz/unspecified, performance consistent with 330400 within the same frequency band

Frequency response: -10 Hz-15 kHz: ± 3 dB/-30 Hz-10 kHz: ± 10%

(Ensure accurate capture of vibration signals within a wide frequency range)/Completely consistent with 330400

Temperature sensitivity: typical value -11% to+3% (the rate of change of sensitivity with temperature within the operating temperature range)/completely consistent with 330400

Lateral sensitivity:<5% (relative to axial sensitivity, reducing the impact of installation angle errors on measurement)/completely consistent with 330400

Installation resonance frequency:>30 kHz (to avoid interference from resonance on high-frequency vibration measurement)/completely consistent with 330400

Power requirements: - Input voltage: -24 ± 0.5 Vdc

-Bias current: 2 mA (nominal)/exactly consistent with 330400

Output bias voltage: -8.5 ± 0.5 Vdc (reference voltage relative to ground)/completely consistent with 330400

Grounding design: shell isolation (to avoid interference with measurement signals caused by grounding loops)/completely consistent with 330400

Maximum cable length: 305 meters (1000 feet), with no signal attenuation when using the specified cable, identical to 330400.

Environmental adaptability parameters

1、 Temperature range

Working and storage temperature

Range: -55 ° C to+121 ° C (-67 ° F to+250 ° F)

Explanation: The sensor can work stably in extreme high and low temperature environments, suitable for high temperature equipment such as industrial furnaces and steam turbines, or cold outdoor scenes. It can also withstand this temperature range during storage without the need for additional temperature control protection.

2、 Impact bearing capacity

Impact limit

Peak value: 49050 m/s ² (5000 g)

Description: It can withstand severe mechanical impacts (such as accidental collisions during installation, instantaneous impacts during equipment start-up/shutdown), ensure that internal components are not damaged, and is suitable for heavy industrial environments with severe vibrations (such as mining machinery and stamping equipment).

3、 Humidity and protective performance

relative humidity

Tolerance range: 100% condensation (non submerged state)

Protection design: The sensor housing is sealed tightly and made of 316L stainless steel material, which can prevent water vapor and dust from entering the internal circuit. It is suitable for humid workshops, outdoor rainy and snowy environments, or high humidity process flows (such as papermaking and food processing).

IP rating

Equivalent protection: IP68 (dustproof and waterproof)

Note: This level is only applicable to the sensor body, and the cable part needs to be separately protected to avoid water ingress or wear.

4、 Magnetic field anti-interference ability

Magnetic field sensitivity

Limit value:<2.21 mm/s ²/Gauss (225 mg/Gauss), test conditions are 50 Gauss, 50-60Hz magnetic field

Explanation: In strong electromagnetic environments (such as near motors and transformers), it is less affected by magnetic field interference, ensuring the accuracy of vibration measurement data and reducing false signals.

5、 Base strain sensitivity

Regarding the differences in different serial numbers

The serial number starts with "G" (produced after April 2004): 49 mm/s ²/mstrain (0.005 g/mtrain), and the influence of substrate strain on measurement is minimal, so there is no need to install an additional base.

Serial number without "G" (produced before April 2004):

When there is no installation base: 980 mm/s ²/mstrain (0.100 g/mtrain), with high strain sensitivity, it needs to be used in conjunction with a dedicated installation base.

When equipped with a mounting base: 4.9 mm/s ²/mstrain (0.0005 g/mtrain), it can effectively reduce substrate strain interference.