Introduction
The Bently Nevada 990-04-70-01-00 is a specific model from the Bently Nevada 990 series of Velocity Seismic Transducers. 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.
This transducer is a passive, self-generating sensor that operates on the electromagnetic induction principle. It contains a permanent magnet seismic mass suspended by springs within a coil. When the transducer's casing vibrates, the coil moves relative to the magnet, generating an analog voltage output signal directly proportional to the vibration velocity. It requires no external power, making it simple, robust, and ideal for monitoring general-purpose industrial equipment.
Parameters / Specifications
The key technical specifications for the Bently Nevada 990-04-70-01-00 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 990-04-70-01-00 |
| Product Line / Type | Bently Nevada 990 Series Velocity Seismic Transducer |
| Measured Parameter | Casing Vibration Velocity |
| Sensitivity | 100 mV/in/s (This is defined by the -04 suffix) |
| Frequency Range | 4.5 Hz to 450 Hz (270 to 27,000 CPM) (This is defined by the -70 suffix) |
| Amplitude Range | 0 to 1.0 in/s (0 to 25.4 mm/s) peak (typical) |
| Output Signal | Analog Voltage (self-generating, no external power required) |
| Power Supply | None (Passive device) |
| Electrical Connection | Integrated, unconnectorized cable (This is a key interpretation of the -01 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: The suffix interpretations are based on standard Bently Nevada 990 series configuration codes.
Application Scenarios
This velocity transducer is a versatile workhorse for general-purpose machinery condition monitoring, providing reliable vibration data for predictive maintenance programs.
Typical Application Scenarios:
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, and bearing defects.
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.
Non-Critical Equipment Protection:
Providing a cost-effective solution for alarm and shutdown protection on general-purpose machines where a full eddy current 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
Global direct procurement guarantee
All products are purchased directly from overseas original manufacturers or authorized channels, 100% guaranteed genuine quality, sufficient spot inventory, and comprehensive model coverage
Quality Commitment
Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
Flexible procurement plan
- Bulk order enjoys Friendship discount (2 pieces or more can be applied)
- Long-term cooperative customers can apply for priority supply
Full service support
7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
Why do so many customers choose us?
On the basis of the same quality, we provide:
- More competitive price system
- Faster logistics response
- More complete technical support (free product technical documentation)
Your trust is the driving force for our continuous progress, submit your requirements immediately to get exclusive quotes
