Description

The BENTLY NEVADA 1900/65A is a high-performance industrial velocity transducer designed for permanently monitoring the casing vibration, or relative seismic vibration, of critical machinery. This self-generating sensor operates on the electromagnetic induction principle, where a magnetic mass moves within a coil of wire, producing a voltage output signal that is directly proportional to the velocity of the vibration. Unlike proximity probes that require an external power source and measure relative displacement between the probe tip and a shaft, the 1900/65A measures absolute vibration on the machine’s structure itself, such as on bearing housings, compressor skids, or valve decks. Its core function is to detect and quantify overall vibration levels caused by mechanical looseness, bearing defects, imbalance, misalignment, and other common machinery faults that are transmitted through the structure.

The intrinsic value of the BENTLY NEVADA 1900/65A lies in its ruggedness, simplicity, and self-powered operation. This makes it an exceptionally reliable and low-maintenance solution for long-term monitoring in harsh environments. Because it generates its own signal, it requires no external power supply or expensive proximitor cabling, significantly simplifying installation and reducing overall system cost. The transducer is engineered to withstand high temperatures, corrosive atmospheres, and significant shock and vibration itself, ensuring consistent performance and data integrity. The 1900/65A provides a vital perspective on machine health, complementing shaft vibration data to give maintenance teams a complete picture of the asset’s condition, which is essential for effective predictive maintenance and preventing catastrophic failures.

1900/65A BENTLY

Technical Specifications

Parameter Name	Parameter Value
Product Model	1900/65A
Manufacturer	Bently Nevada (Baker Hughes)
Product Type	Velocity Seismic Transducer (Piezoelectric)
Sensitivity	100 mV/in/sec ± 5% (or 4 mV/mm/sec, other ranges available)
Frequency Response	4.5 Hz to 1000 Hz (270 CPM to 60,000 CPM)
Measurement Range	0 to 1.0 inch/sec peak (0 to 25.4 mm/sec peak) velocity
Phase Response	Linear within ±5° over specified range
Electrical Output	Self-generating, 2-wire
Operating Temperature Range	-50°C to +120°C (-58°F to +248°F)
Case Material	316 Stainless Steel
Connector	Integral, waterproof military-style connector or conduit entry
Weight	Approximately 0.5 kg (1.1 lbs)

Main Features and Advantages

The BENTLY NEVADA 1900/65A delivers a compelling set of features centered on durability and signal integrity. Its foremost advantage is its self-generating nature. By producing its own power, it eliminates the need for external power supplies and the associated wiring, which reduces installation complexity, potential points of failure, and overall system cost. This also makes it inherently safe for use in hazardous areas. The transducer is renowned for its robust mechanical construction. The all-welded, stainless steel housing and hermetically sealed electronics provide exceptional protection against moisture, humidity, and corrosive chemicals, ensuring long-term reliability in the most demanding plant environments, from offshore platforms to chemical processing plants.

Another key feature is its excellent signal-to-noise ratio and wide frequency response. The 1900/65A is designed to provide a clean, high-fidelity voltage signal that accurately represents the true vibration velocity of the machine structure, making it ideal for both overall vibration trending and for more advanced spectral analysis to diagnose specific fault frequencies. Its integrated, robust connector system prevents wiring failures—a common problem with cheaper sensors that use small, fragile connectors. The proven design and manufacturing quality of the BENTLY NEVADA 1900/65A mean it delivers consistent, accurate data year after year with zero maintenance, providing a highly dependable foundation for any machinery health monitoring program.

Application Field

The BENTLY NEVADA 1900/65A is deployed across a vast range of industries to protect assets where measuring casing or structural vibration is critical for assessing machine health. In the power generation sector, it is extensively used on turbine bearing housings, boiler feed pumps, large motors, fans, and coal pulverizers to detect issues like bearing wear and structural resonance. In the oil and gas industry, this transducer is a workhorse on gas compressor frames, pipeline pumping stations, and critical pumps on offshore platforms, where its ruggedness is essential for surviving the harsh environment.

Within chemical, petrochemical, and refining plants, the 1900/65A monitors large reactors, mixers, centrifuges, and cooling tower fans, providing early warning of mechanical degradation. It is also fundamental in primary industries such as pulp and paper, mining, and metals on rolling mills, crushers, and large paper machine dryers. Any application involving rotating or reciprocating machinery where reliability is paramount and where a robust, low-maintenance vibration sensor is required is an ideal use case for the BENTLY NEVADA 1900/65A velocity transducer.

1900/65A BENTLY

Related Products

1900/55: Another Bently Nevada Velomitor model, often with different sensitivity or form factor.

3300 XL 8mm Proximitor System: The industry-standard eddy current system for measuring shaft relative vibration and position, providing complementary data to the casing vibration from the 1900/65A.

1900/27: A 4-channel vibration transmitter that can accept the signal from a 1900/65A and convert it to a 4-20 mA output for the DCS/PLC.

3500/42M: A 4-channel analog monitor in Bently Nevada’s flagship 3500 system that can condition and monitor signals from velocity transducers.

1701/61: A single-channel vibration transmitter, often used with a single velocity sensor.

Accelerometers: Sensors that measure high-frequency vibration (acceleration), used for different analysis than velocity transducers.