Bently Nevada is an undisputed expert in condition monitoring solutions. Their comprehensive sensor family encompasses a wide range of sensors, including proximity sensors, pressure sensors, speed and acceleration sensors, wireless condition monitoring sensors, hydraulic sensors, and related housings and accessories, fully meeting the needs of a broad customer base for preventative maintenance, avoiding unplanned downtime, and reducing maintenance costs.

Part 1: Proximity Probes and Sensor Systems
Proximity sensors are ideal for measuring rotor shaft position and vibrations within hydrodynamic bearing clearances, demonstrating superior performance in a variety of applications, even in harsh environments. This sensor technology family includes proximity probes, sensors, and transmitter systems (for detecting acceleration, speed, and pressure) to monitor your systems and minimize unplanned downtime. Key products include the following:

1. 3300 5mm Proximity Probe. Sensor and Transmitter Systems

The 3300 5mm proximity sensor system features a smaller probe diameter and can be connected to an XL 8mm extension cable and a 5mm proximity sensor. The output voltage provided by this system is proportional to the distance between the probe tip and the conductive surface being measured. This system measures both static (position) and dynamic (vibration) data. Its primary applications are vibration and position measurement in hydrodynamic bearing machinery, as well as key phase quantity and velocity measurement. The 3300 5mm proximity sensor system includes the 3300 5mm probe, the 3300 XL 5mm extension cable, and the 3300 XL 5mm proximity sensor.

2. 3300 XL 8mm Proximity Probe, Sensor, and Transmitter System

The 3300 XL 8mm system is the most advanced product in Bently's eddy current proximity sensor system. The standard 3300 XL 8mm 5m system fully complies with the American Petroleum Institute (API) Standard 670 (Fourth Edition) requirements regarding mechanical construction, linear sensing range, accuracy, and temperature stability. All 3300 XL 8 mm proximity sensor systems achieve this level of performance and support complete interchangeability of the probe, extension cable, and Proximitor† sensor, allowing for surface matching without the need for individual component matching or bench calibration. The 3300 XL 8 mm proximity sensor system includes: 3300 XL 8 mm proximity probe, 3300 XL 8 mm extension cable, and 3300 XL 8 mm proximity sensor.

3. 3300 XL 11 mm Proximity Probe, Sensor, and Transmitter System

The 3300 XL 11 mm proximity sensor system is a standard eddy current proximity measurement system. Suitable for a variety of applications, it offers a linear measurement range of 4 mm (160 mil) and provides an output of 3.94 V/mm (100 mV/mil) for measuring vibration and displacement. The 11 mm probe provides a longer linear measurement range, compensating for the insufficient measurement range of the standard 8 mm probe. The 330 XL 11 mm sensor system is certified in Europe and North America and can be installed and used in hazardous areas. The 3300 11 mm proximity sensor system consists of the following components: 3300 XL 11 mm probe, 3300 XL 11 mm extension cable, and 3300 XL 11 mm proximity sensor.

4. 3300 XL 16mm High Temperature Turbine Sensor System

The 3300 XL High Temperature Proximity Sensor System (HTPS) can withstand extreme temperatures (rated at +350°C or +662°F). This high-temperature sensor is suitable for use inside gas turbines, steam turbines, and other types of rotating machinery. The 16mm system measures data such as vibration, thrust position, differential expansion, mode shape analysis, seal clearance, labyrinth seals, steam turbine bearing support struts, and gas turbine exhaust paths.

5. 3300 XL 25mm Steam Turbine Sensor and Transmitter System

The 3300 XL 25mm proximity transmitter system offers an extended linear measurement range of 12.7 mm (500 mil), making it ideal for steam turbine TSI (Steam Turbine Monitoring Instrumentation) systems. This system is used to measure the differential expansion (DE) caused by the difference in expansion rates between the turbine rotor and stator (casing) of medium to large steam turbine generators, playing a crucial role in any integrated TSI system. The 25mm probe operates normally in the most demanding turbine differential expansion environments. This 25mm proximity sensor features RFI/EMI immunity and achieves European CE certification without special installation.

6. 3300 XL 50mm Turbine Sensor and Transmitter System

The 3300 XL 50mm proximity transmitter system boasts the longest linear measurement distance of all our eddy current proximity sensor systems, with a measurement range of 27.9 mm (1100 mil). The 3300 XL 50mm system is used to measure the differential expansion (DE) between the rotor and stator of large turbine generators and is a crucial input to turbine monitoring instrumentation (TSI) systems. This 50mm system can withstand the most demanding turbine environments. The RFI/EMI immunity of our 50mm proximity sensor allows it to achieve European CE certification without special installation.

7. 3300 XL Ceramic Probe
8. 3300 XL NSv Compressor Sensors
9. 3300 XL Underwater Probe
10. PROXPAC XL Proximity Transducer Assembly

Part 2 Pressure Sensors 

When accurate and operable data on various pressure states of all industrial machinery within a factory (including ATEX-protected areas, hazardous locations, or harsh environments) is required, the Bently Nevada series of industrial oil and gas pressure sensors and pressure transmitter systems provides peace of mind. Bently Nevada pressure sensors can detect both static and dynamic pressure, have a long service life (over 50 million cycles), and can operate in high-humidity environments. They have a wide range of applications, covering various equipment such as water turbines, centrifugal pumps, and reciprocating compressor cylinders. All products operate stably in high humidity and harsh chemical environments. Pressure sensors mainly include two types.

1. Cylinder Pressure Sensor and Transmitter

The 165855 cylinder pressure sensor is optimized for measuring cyclic absolute pressure changes within the cylinders of reciprocating compressors. It integrates with our 3500/77M cylinder pressure monitor and System 1 condition monitoring software and must be compatible with the gas pressure or fluid type in which the sensor operates. This robust sensor provides accurate pressure readings even after prolonged continuous operation under large pressure gradients.

2. Piezoresistive Pressure Sensor (Pressure Pulsation)

The 350300 dynamic pressure sensor provides dynamic (high-frequency waveform) measurements for turbine or pump monitoring. Utilizing piezoresistive technology, it measures pressure pulsations up to 2 kHz. This sensor detects rough load areas, hydraulic phenomena such as eddies and cavitation in the tailrace and sump regions, as well as pulsations in the intake manifold. It can also detect cavitation and other flow instabilities that can damage machinery and operation.

Part 3 Velocity Sensors and Accelerometers

Bently Nevada's accelerometers, speedometers, and other acceleration and velocity sensing tools are equipped with a variety of functions and can withstand extreme temperatures, making them ideal for harsh industrial environments and space-constrained locations. Velocity sensors are self-powered and radiation-resistant, while accelerometers are protected against electrical hazards and offer portable data acquisition capabilities. Key features include extreme temperature resistance, flexibility and reliability, radiation resistance, low-frequency sensing, electrical isolation, monitoring of gear meshing frequencies, and full compatibility with portable data acquisition devices.

1. Accelerometers and Dedicated Accelerometers

1.1 330400/330425 Accelerometers/Accelerometers and other housing-type accelerometers provide acceleration measurements in g or m/s². The sensors have a standardized output voltage proportional to the magnitude of the acceleration, are compatible with a variety of condition monitoring solutions, and can detect vibration frequencies from 0.2 to 14,000 Hz.

1.2. The 20015x accelerometers, such as the 200150, 200155, and 200157 models, are general-purpose, wide-frequency, housing-mounted seismic sensors designed for use with Trendmaster proTIM.

1.3. 200355 Accelerometer

1.4. The AM series accelerometers are general-purpose housing-mounted seismic sensors designed for use with Trendmaster Pro Constant Current Direct Input Cards (part number 149811-02) and Seismic Direct Input Cards (part number 164746-01). The AM series accelerometers feature a sealed stainless steel housing, making them extremely robust and durable, ideal for harsh industrial environments. Each sensor has a 2-pin connector (compliant with MIL-C-5015) on the top for easy installation and removal of signal cables. A ¼-28 threaded hole on the bottom of the housing allows for various mounting options. The AM series accelerometers incorporate a piezoelectric sensing element that generates an electrical charge upon vibration. The charge is then converted by electrons into a differential voltage signal, which is proportional to the acceleration parallel to the sensor's sensitive axis.

The Bently Nevada Seismoprobe velocity sensor system is designed to measure absolute vibration (relative to free space) of bearing housings, housings, or structures. This two-wire system consists of a sensor and a corresponding cable. The Seismoprobe series of velocity sensors uses a moving-coil two-wire design, providing a voltage output proportional to the sensor's vibration velocity. Compared to solid-state velocity sensors (essentially accelerometers with embedded integrated electronics), moving-coil sensors are less sensitive to shock or pulse excitation. Moving-coil sensors are a good choice for certain applications. They are convenient for portable measurement applications because they do not require an external power supply.

1.5 The 9200 is a two-wire sensor suitable for continuous monitoring or periodic measurements when used with test or diagnostic instruments. With the optional integrated cable, the 9200 maintains excellent corrosion resistance in corrosive environments without additional protection.

1.6 The 74712 is the high-temperature sensor model of the 9200.

1.7 The 370300 accelerometer is designed to provide high electrical isolation between the sensor base and its internal electronics. This isolation effectively protects against arcing/electrostatic discharge (ESD) up to 6,000 volts. The sensor has a peak amplitude range of 80 g and a sensitivity of 100 mV/g.

1.8 The 350900 High Temperature Velocity and Accelerometer Sensor (HTVAS) provides continuous acceleration and velocity outputs, allowing users to acquire acceleration signals for machine diagnostics while simultaneously protecting the machine with velocity signals. This sensor is primarily used with 3500/42M and 3500/44M displays. When connecting the HTVAS to a 3500/42M or 3500/44M display, the sensor's acceleration and velocity signals must be connected to different channel pairs (e.g., channels 1 and 3) or different displays, respectively.

2. Speed ​​Sensors and Dedicated Speed ​​Sensors

2.1 The 190501 Velomitor † CT (Cooling Tower) is a low-frequency speed sensor designed based on our standard 330500 Velomitor, equipped with a sensor suitable for hazardous areas. The 190501 features a unique frequency range, adjustable down to 3.0 Hz to 900 Hz ±1.0 dB or 1.5 Hz to 1.0 kHz ±3.0 dB, enabling this speed sensor to measure fan vibrations as low as 90 rpm. The 190501 can transmit signals over cable up to 305 meters (1000 feet) while still providing the sensitivity you need (3.94 mV/mm/s (100 mV/in/s) ±5%).

2.2 The 330500 Velomitor is a rugged, two-pin integrating piezoelectric accelerometer, ideally suited for condition monitoring of rolling bearing machinery, particularly for applications requiring vibration measurements in velocity units. The 330500 is certified for multiple hazardous areas and can be used with cables up to 305 meters (1000 feet) long while still providing excellent sensitivity—3.94 mV/mm/s (100 mV/in/s) ±5%—and a frequency range of 4.5 Hz to 5 kHz ±3.0 dB or 6.0 Hz to 2.5 kHz ±0.9 dB.

2.3 The Bently Nevada Low Frequency Velocity Sensor System (LFVTS) is designed for measuring low-frequency, low-amplitude vibrations in mechanical equipment, such as low-speed rotating equipment like hydraulic turbines, where the detection of weak vibration signals is crucial. This system can detect vibrations in the stator core, stator frame, and bearing housing.

The 2.4 330525 Velomitor XA piezoelectric velocity sensor is an upgraded version of the 330500 Velomitor, offering greater ruggedness and durability for data acquisition in harsher environments. The 330525 features a 316L stainless steel housing and a unique weatherproof connector and cable assembly, allowing for housing-less installation. Designed to withstand a variety of hazardous environments, this sensor maintains extremely high sensitivity (3.94 mV/mm/s (100 mV/in/s) ±5%), a wide frequency range (4.5 Hz to 2 kHz ±3.0 dB or 6.0 Hz to 1 kHz ±0.9 dB), and can be used with cables up to 305 meters (1000 feet).

2.5 The Model 330530 radiation-hardened velocimeter is a rugged, two-pin integrating accelerometer that blocks gamma rays, with a maximum absorbed dose of 12.0 Mrad and a sensitivity range of 3.94 mV/mm/s (100 mV/in/s) ±5%. The Model 330530 has a maximum cable length of 305 meters (1000 feet) and is approved for use in a variety of hazardous environments, in addition to radioactive environments.

2.6 The Model 330750 and 330752 high-temperature velocity sensors feature a unique design that separates the sensing element from the signal conditioning electronics. This design allows the sensor head to be mounted on surfaces up to 400°C (752°F), while the signal conditioning electronics are located in a lower-temperature location, thus still providing a sensitivity of 5.7 mV/mm/s (145 mV/in/s) ±5%. These high-temperature speed sensors can operate with cable lengths up to 305 meters (1,000 feet) without signal attenuation and offer a wide frequency range: 15 Hz to 2000 Hz ± 3.0 dB or 20 to 1000 Hz ± 0.9 dB.

Part 4 Wireless Vibration Sensors

When remote vibration monitoring automation is required for predictive maintenance, and when multiple wireless vibration sensors need to be deployed quickly and easily in an industrial wireless network, with encrypted data transmission, long battery life, and the ability to operate in hazardous environments, Bently Nevada's Ranger Pro condition monitoring sensors are the best choice. Ranger Pro provides online condition monitoring and vibration analysis data, collecting critical machine health data from a variety of industrial applications, including power generation, oil and gas, mining, pulp and paper, and metal processing. More than just a vibration monitoring sensor, Ranger Pro also provides 24/7 monitoring of speed, acceleration, and temperature for critical equipment, as well as time-base waveform, spectrum, and peak demodulation spectrum analysis. With the Ranger Pro wireless vibration monitoring system, reduce unplanned downtime and extend machine life through condition-based predictive maintenance monitoring solutions.

Part 5 Hydraulic Sensors

When you need to understand the operating status of a hydroelectric generator, Bently Nevada's hydraulic sensor series provides comprehensive assurance.

1. 4000 Series Air Gap Sensor System: Provides monitoring and diagnostic capabilities for all new and existing hydro-generators and generator/generator sets, fully integrated with the 3500/46M hydro-generator monitor and System 1 software. The air gap refers to the distance between the rotor and stator of a hydro-generator. This monitor continuously measures the average air gap, minimum air gap, and maximum air gap, as well as their corresponding pole numbers. The software performs trend analysis on these values ​​and displays them, along with other values ​​related to stator, roundness, and centering misalignment. The air gap monitoring system provides early warnings to operation and maintenance personnel of potential problems with the shape and concentricity of the generator rotor and stator. The 4000 Series capacitive sensors offer two range options: a 20 mm system with a linear range of 18.3 mm, suitable for small to medium-sized generators; and a 50 mm system with a linear range of 45.7 mm, suitable for large generators.

2. 350300 Hydraulic Pressure Sensor
It can be directly connected to a 3500/46M monitor, providing static and dynamic pressure from the same monitor channel, and can be displayed in time and frequency domain formats in System 1 software. The Low Frequency Velocity Sensor System (LFVTS) is designed for measuring low-frequency, low-amplitude vibrations in mechanical equipment, such as low-speed rotating equipment like hydraulic turbines, where weak vibration signals need to be detected. This system can detect vibrations in the stator core, stator frame, and bearing housings.

Part 6 Sensor Accessories
A diverse portfolio of accessories is available, including protective housings, junction boxes, sensor mounting brackets and clamps, as well as wire, hose, and conduit accessories. In addition, we offer a variety of cables, cable protectors, and other products. Furthermore, Bently Nevada offers a variety of test kits for verification, calibration, and mechanical diagnostic simulation for training and educational purposes.