Introduction
The Bently Nevada 990-04-70-02-00 is a specific model of a Velocity Seismic Transducer from the GE Bently Nevada 990 series. This device is designed for continuous monitoring of absolute casing vibration on a wide range of industrial machinery, such as pumps, motors, fans, and compressors.
Unlike eddy current probes that measure shaft motion relative to the bearing housing, this transducer measures the actual vibration velocity of the machine's structure or casing itself. It is a self-generating sensor, containing a permanent magnet seismic mass suspended by springs within a coil. When the casing vibrates, the coil moves relative to the magnet, generating an analog voltage output signal proportional to the vibration velocity. This makes it ideal for monitoring machines where non-contact probe installation is not feasible. The "-04-70-02-00" suffix defines its specific sensitivity, frequency response, and connector configuration.
Parameters / Specifications
The key technical specifications for the Bently Nevada 990-04-70-02-00 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 990-04-70-02-00 |
| Product Line / Type | Bently Nevada 990 Series Velocity Seismic Transducer |
| Measured Parameter | Casing Vibration Velocity |
| Sensitivity | 100 mV/in/s (This is a key interpretation of the -04 suffix). |
| Frequency Range | 4.5 Hz to 450 Hz (This is a key interpretation of the -70 suffix). |
| Amplitude Range | 0 to 1.0 in/s (0 to 25.4 mm/s) peak (typical for this sensitivity) |
| Output Signal | Analog Voltage (self-generating, no external power required) |
| Power Supply | None (Passive device) |
| Electrical Connection | 2-pin, Military-style (MS) connector (This is a key interpretation of the -02 suffix). |
| Mounting | Single 1/4-28 UNF threaded stud on the base. |
| Housing Material | Stainless Steel |
| Sensing Orientation | Specific to one axis (uniaxial). Must be mounted in the correct orientation. |
| Dimensions (Approx.) | Diameter: ~1.9 in (48 mm), Height: ~2.4 in (61 mm) |
| Weight (Approx.) | 1.1 lbs (0.5 kg) |
| Operating Temperature | -50°C to +120°C (-58°F to +248°F) |
Note: Suffix interpretations are based on common Bently Nevada 990 series configuration codes. For absolute certainty, consulting the official product datasheet is recommended.
Application Scenarios
This velocity transducer is a workhorse for general-purpose machinery condition monitoring on a wide variety of equipment where measuring the overall vibration of the machine structure is sufficient for detecting developing faults.
Typical application scenarios include:
Motor and Pump Casing Monitoring:
Permanently installed on the bearing housings of critical motors, centrifugal pumps, and fans to detect overall vibration levels caused by imbalance, misalignment, bearing defects, or structural resonance.
Fan and Blower Monitoring:
Mounted on the casings of large induced draft (ID) and forced draft (FD) fans in power plants and HVAC systems to monitor for vibration due to fouling, imbalance, or mechanical looseness.
General Machinery Health Assessment:
Used for periodic or continuous monitoring on a wide range of industrial machinery, such as compressors, gearboxes, and machine tools, to provide a trendable velocity signal for predictive maintenance programs.
Non-Critical Equipment Protection:
Providing a cost-effective solution for alarm and shutdown protection on a large number of general-purpose machines where the installation of a full eddy current probe system is not economically justified.
Industries of Use:
Power Generation (for auxiliary equipment)
Water and Wastewater Treatment
Chemical and Petrochemical Processing
HVAC
General Manufacturing and Heavy Industry
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