Product Introduction
The Bently Nevada 330851-05-000-040-50-01-05 is a 25mm proximity probe from the 3300 XL series, designed for accurate condition monitoring of rotating machinery. This model is particularly suited for larger or more complex industrial machinery requiring extended measurement capabilities. It’s engineered to detect imbalances, misalignments, bearing wear, and other faults that could compromise equipment performance, providing critical data that enables predictive maintenance and minimizes the risk of unexpected breakdowns.
Constructed from stainless steel, the 3300 XL 25mm Proximity Probe ensures durability and resistance to corrosion, even in harsh industrial environments. The probe’s long 5-meter cable and high-performance sensing capabilities make it a versatile solution for monitoring large or difficult-to-access machinery. It works seamlessly with Bently Nevada’s 3300 XL monitoring system to deliver high-precision measurements, helping companies achieve better reliability, efficiency, and uptime.

Product Specifications
Specification |
Value |
Model |
Bently Nevada 330851-05-000-040-50-01-05 |
Probe Type |
Proximity Probe (25 mm) |
Probe Size |
25 mm diameter |
Total Length |
5.0 meters |
Weight |
0.95 kg |
Material |
Stainless Steel |
Temperature Range |
-40°C to +120°C |
Mounting Type |
Surface Mount |
Signal Type |
4-20mA Output |
Operating Voltage |
10-30 VDC |
Measurement Range |
0-25 mm |
Accuracy |
±0.05 mm |
Applications
The 3300 XL 25mm Proximity Probe is ideal for use in a variety of industrial applications where precise monitoring of machinery is critical:
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Vibration Monitoring: Used to monitor vibration levels in rotating equipment like motors, turbines, compressors, and pumps, helping to detect imbalance or misalignment early.
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Condition Monitoring: The probe tracks the displacement of the machinery’s shaft, detecting faults such as bearing wear, shaft misalignment, or misalignments before they cause major damage.
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Predictive Maintenance: Continuous real-time measurements allow operators to identify potential failures ahead of time, enabling planned downtime for maintenance and reducing the chance of unexpected breakdowns.
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Machinery Protection: As part of a machinery protection system, the 3300 XL 25mm Proximity Probe monitors key parameters to ensure equipment operates within safe limits.
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Rotating Equipment Monitoring: Essential for monitoring rotating equipment, such as large motors, turbines, and generators, where accurate displacement measurements are critical.
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Process Industries: Frequently used in heavy industries like power generation, oil & gas, and manufacturing, where machinery uptime is essential for operational efficiency.
Advantages
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High Accuracy: With an accuracy of ±0.05 mm, the 3300 XL 25mm Proximity Probe offers highly precise measurements, enabling the detection of even minor deviations in machinery performance.
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Wide Temperature Range: The probe operates in extreme temperatures, from -40°C to +120°C, making it suitable for a wide range of industrial environments.
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Durable Construction: Made from stainless steel, the probe is resistant to corrosion and designed to withstand harsh conditions typically found in industrial settings.
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Extended Measurement Range: The 5-meter cable provides flexibility for installations on larger machinery or in areas that are difficult to access, making it ideal for complex setups.
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Real-Time Data: Provides continuous, real-time feedback on the health of rotating machinery, enabling predictive maintenance and reducing downtime.
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Easy Integration: The probe provides a 4-20 mA output, which is compatible with most industrial monitoring systems, simplifying integration into existing setups.
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Cost-Effective Maintenance: By detecting issues early, this probe helps extend the life of machinery, reduce repair costs, and prevent unplanned shutdowns.
These sensors are used to monitor the casing vibration of large and medium-sized rotating machinery, including steam turbines, water turbines, fans, compressors, turboexpanders, motors and generators, exciters, gearboxes, water pumps, etc. They are widely applied in industries such as electric power, petroleum, chemicals, and metallurgy, as well as in some scientific research institutions.
The Accelerometer 200150 is exclusively used with compatible Transducer Interface Modules (TIMs) in the Trendmaster Pro quasi-continuous online condition monitoring system. The specific frequency response of this accelerometer is only suitable for general application scenarios. When monitoring machines with relatively slow rotational speeds, please use the 200155 accelerometer together with a properly configured proTIM. For acceleration envelope applications, use the 200157 accelerometer with a properly configured proTIM.
The piezoelectric sensing device in the 20015x series accelerometers generates an electric charge when subjected to vibration. The 20015x accelerometers are housed seismic sensors suitable for general purposes, featuring a wide frequency range. When used in conjunction with Trendmaster® proTIMs, these accelerometers can convert the generated charge into a differential voltage signal that is proportional to the acceleration parallel to the sensor’s sensitive axis.
The 20015x accelerometers have a hermetically sealed, stainless steel housing, making them highly robust and ideal for use in harsh industrial environments. A 5-pin connector mounted on the top of the sensor allows for easy installation and removal of interconnecting signal cables. A 3/8-24 threaded hole at the bottom of the sensor housing supports multiple mounting options.
The 200350 and 200355 accelerometers are housed vibration sensors designed for general applications. They are used in combination with Trendmaster Pro.
The low-frequency velocity sensor is specifically designed for hydraulic applications to detect vibrations in stator cores, stator frames, and bearing supports. Accessory housings, mounting kits, and other accessories can protect your sensor system assets and enable faster, more convenient installation.
This sensor measures absolute vibration in the frequency range of 0.5 Hz to 1.0 kHz. Its dual-wire design adopts moving-coil technology and built-in signal conditioning circuitry to provide a voltage output proportional to vibration velocity. The sensor is used with the 3500/46M Hydraulic Monitor.
- Sensitivity: 20 mV/(mm/s) (508 mV/(in/s)) ±10%
The 330450 high-temperature accelerometer isolates the sensing element from the signal conditioning electronics.
The 330400/330425 accelerometers are specifically designed for measuring the acceleration of general-purpose casings and meet all requirements of API 670.
The 190501 Velomitor® CT is a low-frequency sensor specifically designed for monitoring cooling towers, capable of detecting rotational speeds as low as 90 rpm.
These systems are intended for applications where the ambient temperature is significantly higher than the operating range of other Velomitor® sensors.
GE’s new Bentley Nevada radiation-resistant Velomitor® sensor is specifically designed for the harsh environments of nuclear power plants.
The 330525 Velomitor® XA is a rugged environmental piezoelectric velocity sensor. It is an enhanced version of the 330500 Velomitor® sensor, designed to meet NEMA 4X and IP65 ratings for applications without an additional housing.
The 330500 Velomitor® is a general-purpose velocity sensor, suitable for frequencies ranging from 4.5 Hz to 5000 Hz.
The Velomitor® 350900 is a high-temperature sensor for both velocity and acceleration measurement. It is specifically designed for use in gas turbines.