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- Bently Nevada
- 330750-40-05
- High Temperature Velomitor Velocity Sensor
- USA
- 33.4 mm × 152.1 mm
- 0.79kg
- Xiamen, China
- New & In Stock
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Bently Nevada 330750-40-05 — Detailed Product Description, Technical Specifications, Applications, Advantages, and Related Models
1. Product Overview
The Bently Nevada 330750-40-05 is a model designation associated with the High Temperature Velomitor vibration monitoring product family. This product family is intended for industrial applications where vibration velocity needs to be measured at machinery locations exposed to elevated temperatures.
The main design feature is the separation of the sensing head from the signal-conditioning electronics. This allows the sensing head to be installed close to a hot machine surface while the electronic section is positioned farther away in a cooler area, provided that the installation remains within the applicable temperature and environmental limits.
The nominal 4 m cable configuration provides additional installation flexibility for machinery where the measurement point and the preferred electronics mounting location are separated by some distance.
Brand: Bently Nevada
Product series: 330750 High Temperature Velomitor System
Product category: Industrial vibration velocity transducer
Primary function: Machinery vibration measurement, condition monitoring, and maintenance assessment
Typical industries: Power generation, petrochemical processing, oil and gas, and industrial manufacturing
Model identification note: The -05 suffix may identify an additional ordering or configuration detail. Its exact meaning should be confirmed before assigning a specific approval, connector arrangement, or other configuration-dependent specification to the complete part number.
2.1 Electrical and Environmental Performance
The following parameters describe the main operating characteristics of the 330750 High Temperature Velomitor System.
| Technical item | Specification |
|---|---|
| Sensitivity | 5.7 mV/mm/s (145 mV/in/s), ±5% |
| Frequency response | 15–2,000 Hz, ±3 dB |
| Improved frequency-response range | 20–1,000 Hz, ±0.9 dB |
| Transient temperature sensitivity | Approximately 0.0762 mm/s/°C |
| Amplitude linearity | ±2% up to 152 mm/s peak |
| Maximum amplitude range | 635 mm/s peak below 680 Hz; 2,940 m/s² peak above 680 Hz, subject to specified conditions |
| Transverse sensitivity | Less than 5% of nominal sensitivity |
| Mounted resonant frequency | Greater than 5 kHz |
| Output bias voltage | −12 ±2 VDC |
| Broadband noise floor | Approximately 0.127 mm/s RMS over 15 Hz–2 kHz |
| Sensing-head temperature | −55°C to +400°C |
| Integral cable temperature | −55°C to +400°C |
| Electronics temperature | −55°C to +121°C |
| Shock survivability | Up to 2,500 g peak under specified test conditions |
| Relative humidity | Up to 100%, non-submerged |
| Housing material | 300-series stainless steel |
| Connector | Hermetically sealed, two-pin MIL-C-5015 receptacle |
| Minimum cable bend radius | Approximately 51 mm |
| Grounding | Case isolated |
| Weight (kg) | 0.794 kg typical for the 4 m system |
These specifications apply to the relevant product-family design. Operating limits and performance values must be interpreted under the specified test conditions.
3. Product Dimensions and Weight
The mechanical design consists of a sensing head, an integral hardline cable, and an electronics housing. The cable length is specified separately from the dimensions of the sensing head and electronic section.
| Component | Dimensions | Weight (kg) |
|---|---|---|
| Sensor head | Approximately 25.4 mm diameter; approximately 34.9 mm mounting-related dimension on the applicable drawing | Not separately specified |
| Integral cable | Approximately 3.2 mm diameter × 4,000 mm nominal length | Included in assembly weight |
| Electronics housing | Approximately 33.4 mm diameter × 152.1 mm long | Not separately specified |
| Connector | Two-pin MIL-C-5015 receptacle; exact connector envelope depends on the drawing | Not separately specified |
| Complete 330750-40-05 system | Full assembly dimensions depend on the mechanical arrangement and cable routing | 0.794 kg typical |
| Shipping package | Depends on packaging and included accessories | Requires confirmation |
The 0.794 kg figure represents the typical weight associated with the 4 m configuration, rather than a guaranteed shipping weight. For engineering drawings and installation planning, use the model-specific dimensional drawing and the actual supplied unit’s identification details.
4. Product Introduction
The 330750-40-05 is designed for applications where vibration measurement must be performed near hot machinery surfaces without exposing the signal-conditioning electronics to the same temperature.
The product uses a piezoelectric sensing element to measure vibration velocity. Its separated construction allows the sensing head and integral cable to operate in the specified high-temperature environment, while the electronics are positioned in a cooler area.
This design is particularly useful for machinery operating continuously under high thermal and mechanical loads. The nominal 4 m cable length provides installation flexibility when the sensor location is some distance from the preferred electronics mounting point.
The sensor supplies measurement signals to compatible monitoring equipment. Those signals can be used to establish vibration baselines, compare operating conditions, track changes over time, and support maintenance decisions.
The system is a measurement component rather than a complete diagnostic solution. Its effectiveness depends on correct installation, compatible instrumentation, and proper interpretation of the measured data.
5. Main Industrial Applications
5.1 Steam Turbines and Power Generation
Steam turbines operate with elevated casing temperatures and substantial mechanical loads. The 330750-40-05 can be considered for suitable casing vibration measurement points where high-temperature sensing is required.
Typical uses include monitoring vibration trends during normal operation, comparing readings under different loads, and providing measurement data for maintenance assessments.
The sensor is intended for appropriate casing vibration measurements. It should not be used as a substitute for shaft-relative vibration probes or axial-position sensors when those measurement types are required.
5.2 Industrial Compressors
Compressors used in process plants may operate continuously in hot environments. A high-temperature velocity sensor can provide vibration measurements at selected casing locations while allowing the electronics to be positioned farther from the heat source.
The 4 m cable arrangement can help accommodate equipment layouts where the sensor and electronics cannot be installed close together.
Typical monitoring objectives include tracking vibration changes, recording historical measurements, and identifying conditions that require further inspection.
5.3 Pumps and Process Machinery
Industrial pumps can be installed near hot fluids, heated pipework, or high-temperature process equipment.
Where the mounting surface exceeds the temperature limits of a conventional integrated sensor, the 330750-40-05 may provide a suitable alternative, subject to the applicable specifications.
It can support routine vibration monitoring and maintenance assessment on compatible process pumps and circulation equipment.
5.4 Petrochemical and Refinery Equipment
Refineries and petrochemical facilities contain rotating machinery exposed to high temperatures and demanding operating conditions.
The product can be evaluated for vibration monitoring at suitable high-temperature locations. The complete installation must also satisfy the site’s electrical, mechanical, cable-routing, and hazardous-area requirements.
The applicable approval configuration should be confirmed before specifying the unit for a regulated installation.
5.5 Industrial Fans and Auxiliary Machinery
Large fans, blowers, and auxiliary rotating equipment can experience changes in vibration due to imbalance, misalignment, looseness, and operating-load variation.
Where the selected mounting point is sufficiently hot, the 330750-40-05 may be used to provide vibration velocity measurements for condition monitoring.
The measured signal can help maintenance personnel identify deviations from normal behavior, although determining the underlying fault requires additional diagnostic assessment.
6. Main Product Advantages
| Advantage | Technical explanation | Practical benefit |
|---|---|---|
| High-temperature sensing | The sensing head and cable are designed for operation at elevated temperatures within the specified limits | Enables measurement at selected hot machine locations |
| Separated electronics | The sensing head and signal-conditioning electronics are physically separated | Allows the electronics to be mounted in a cooler area |
| 4 m cable configuration | Provides greater installation distance than shorter cable options | Offers more flexibility when arranging sensor and electronics locations |
| Velocity measurement | Produces a signal related to mechanical vibration velocity | Supports vibration trending and condition assessment |
| Integral cable | Eliminates an intermediate connector between the sensing head and electronics | Reduces potential connection-related failure points |
| Stainless steel construction | Uses stainless steel housing for the applicable assembly | Supports industrial use within specified environmental limits |
| Continuous monitoring support | Supplies measurements to compatible monitoring instrumentation | Helps maintenance teams observe changes over time |
| System integration | Can be incorporated into a suitable machinery-monitoring arrangement | Supports established maintenance and monitoring procedures |
These advantages are most useful when the selected sensor is correctly installed and matched to the machine’s operating conditions and monitoring requirements.
7. Five Related Models in the Same Series
The following five models are suitable candidates for comparison within the same or closely related high-temperature Velomitor family.
| Model | Product series | Main parameters | Dimensions | Weight (kg) |
|---|---|---|---|---|
| 330750-20-05 | High Temperature Velomitor | 2 m cable configuration; high-temperature vibration velocity measurement | Sensor head approximately 25.4 mm diameter; complete assembly dimensions depend on configuration | 0.635 kg typical |
| 330750-60-05 | High Temperature Velomitor | 6 m cable configuration; separated sensing head and electronics | Sensor head approximately 25.4 mm diameter; complete assembly dimensions depend on configuration | 0.953 kg typical |
| 330750-80-05 | High Temperature Velomitor | 8 m cable configuration; intended for installations requiring a longer cable | Sensor head approximately 25.4 mm diameter; complete assembly dimensions depend on configuration | 1.111 kg typical |
| 330752-25 | Related High Temperature Velomitor family | Related high-temperature velocity sensing configuration | Confirm the specific 330752 dimensional drawing | Requires confirmation |
| 330752-80 | Related High Temperature Velomitor family | Related high-temperature velocity sensing configuration; verify exact ordering code | Confirm the specific 330752 dimensional drawing | Requires confirmation |
The weights listed for the 330750 models are typical family values associated with the respective cable lengths. The complete part number, including any approval suffix, should be checked before ordering.
7.1 Model 330750-20-05
The 330750-20-05 is a shorter-cable alternative with a nominal 2 m cable configuration.
It may be suitable when the sensing point and electronics mounting location are relatively close together. A shorter cable can simplify routing and cable support, provided the actual installation layout is compatible.
7.2 Model 330750-60-05
The 330750-60-05 provides a nominal 6 m cable configuration.
It can be considered when the sensor needs to be installed near a hot machine surface and the electronics must be positioned farther away.
The additional cable length may offer greater layout flexibility, although cable support, routing, and environmental protection remain important.
7.3 Model 330750-80-05
The 330750-80-05 is associated with a nominal 8 m cable configuration.
It can be evaluated for large equipment installations where the sensing point and electronics mounting location are separated by a longer distance.
The cable must be installed in accordance with the applicable bend-radius, support, and environmental requirements.
7.4 Model 330752-25
The 330752-25 belongs to the related high-temperature Velomitor family.
It may be considered for compatible installations where the existing system design supports this model. The complete mechanical and electrical characteristics must be verified before substitution.
7.5 Model 330752-80
The 330752-80 is another related model designation within the high-temperature Velomitor family.
Its suitability depends on the exact configuration, cable arrangement, approvals, and monitoring-system interface. It should not be assumed to be mechanically or electrically identical to the 330750-40-05.
8. Five Additional Related Models from the Same Brand
The following products provide alternative approaches to machinery vibration monitoring. They cover conventional velocity measurement and acceleration measurement, so their applications differ from those of the 330750-40-05.
| Model | Product category | Main parameters | Dimensions | Weight (kg) |
|---|---|---|---|---|
| 330500 | Standard Velomitor velocity sensor | Piezoelectric velocity measurement; conventional integrated electronics; maximum operating temperature approximately +121°C for the applicable specification | Confirm exact housing and mounting drawing | Requires confirmation |
| 330525 | Velomitor XA sensor | Industrial vibration velocity measurement; verify sensitivity and interface for the selected version | Confirm exact assembly dimensions | Requires confirmation |
| 330400 | Accelerometer | Piezoelectric acceleration measurement; requires compatible signal conditioning | Confirm exact model dimensions | Requires confirmation |
| 330425 | Accelerometer | Industrial vibration acceleration measurement; application depends on frequency range and sensitivity | Confirm exact model dimensions | Requires confirmation |
| 190501 | Velocity transducer | Related velocity measurement option; compatibility depends on the installed monitoring system | Confirm exact model drawing | Requires confirmation |
These models are presented as related products for technical evaluation, not as a verified ranking of current sales popularity. Exact specifications should be confirmed before using any of them as a replacement.
8.1 Model 330500 — Standard Velomitor Velocity Sensor
The 330500 is a conventional velocity sensor intended for industrial machinery where the measurement location remains within its permitted operating-temperature range.
Its integrated construction may be suitable for pumps, motors, and other rotating machinery where a high-temperature separated-electronics arrangement is unnecessary.
Before selecting it in place of the 330750-40-05, compare temperature limits, sensitivity, frequency response, mounting arrangements, and electrical compatibility.
8.2 Model 330525 — Velomitor XA
The 330525 is a related velocity-sensing product for compatible machinery-monitoring applications.
It may be evaluated when the monitoring system requires velocity measurement and the environmental conditions suit the selected version.
The complete specification should be checked before using it as a replacement for the 330750-40-05.
8.3 Model 330400 — Accelerometer
The 330400 is an accelerometer intended for vibration acceleration measurement.
Acceleration data can be useful for monitoring higher-frequency vibration, impacts, and certain bearing-related phenomena. Its suitability depends on the required frequency range, sensitivity, mounting method, and signal-conditioning equipment.
8.4 Model 330425 — Accelerometer
The 330425 is another industrial accelerometer option.
It can be considered where the monitoring objective specifically calls for acceleration rather than velocity measurement.
Before selecting this model, verify the frequency response, environmental limits, mounting arrangement, and compatibility with the receiving instrumentation.
8.5 Model 190501 — Velocity Transducer
The 190501 is a related velocity transducer that may be considered for compatible monitoring installations.
Its suitability depends on the complete model specification, signal interface, mounting requirements, and operating environment. It should not be treated as a direct substitute without checking those requirements.
9. Model Selection Guide
| Operating requirement | Model to evaluate | Main consideration |
|---|---|---|
| High-temperature measurement with a 4 m cable | 330750-40-05 | Confirm exact approvals and system compatibility |
| High-temperature measurement with a shorter cable | 330750-20-05 | Confirm the actual routing distance |
| High-temperature measurement with a 6 m cable | 330750-60-05 | Confirm cable support and installation requirements |
| High-temperature measurement with an 8 m cable | 330750-80-05 | Confirm routing and the preferred electronics location |
| Conventional velocity monitoring | 330500 | Check the operating-temperature limit |
| Related velocity measurement | 330525 | Check sensitivity and electrical compatibility |
| Acceleration monitoring | 330400 or 330425 | Confirm that acceleration is the required measurement variable |
| Existing compatible velocity-monitoring system | 190501 | Verify the complete electrical and mechanical interface |
The most important selection factors are the sensor-head temperature, required measurement variable, cable length, mounting arrangement, monitoring-system compatibility, and approval requirements.
10. Installation and Maintenance
Mechanical installation
The sensing head should be mounted securely at the designated measurement point. The mounting surface should be mechanically sound and suitable for the required measurement accuracy.
The mounting thread, mounting depth, and fixing method must be checked against the exact product drawing before installation.
Cable routing
The nominal 4 m cable should be routed and supported to prevent abrasion, excessive bending, and unnecessary mechanical stress.
The specified minimum bend radius should be maintained, and the cable should be protected from moving components and other sources of mechanical damage.
Electronics placement
The electronics must remain within their specified operating-temperature range. The high-temperature rating of the sensing head does not mean that the entire assembly can operate at the same temperature.
The preferred electronics location should therefore be selected with adequate consideration of ambient temperature, enclosure conditions, and accessibility for maintenance.
Electrical integration
Before connecting the sensor, confirm the sensitivity, output characteristics, connector arrangement, and receiving channel requirements.
The monitoring system must be configured correctly for the sensor. Incorrect scaling or incompatible input circuitry may result in misleading readings.
Routine inspection
Routine maintenance should include inspection of the mounting condition, cable support, connectors, and any signs of overheating or physical damage.
Vibration measurements should be compared with established baselines and interpreted alongside machine speed, load, and process conditions.
11. Final Product Summary
The Bently Nevada 330750-40-05 is a high-temperature vibration velocity transducer system associated with the 330750 High Temperature Velomitor family.
Its principal characteristics include a nominal 4 m integral cable, separated sensing and electronic sections, a high-temperature sensing-head design, and compatibility with appropriate machinery-monitoring instrumentation.
The product is suited to evaluating vibration at designated hot locations on turbines, compressors, pumps, and other rotating machinery where the operating conditions match its specifications.
Related 330750 configurations offer different cable lengths, while conventional velocity sensors and accelerometers provide alternatives for other monitoring requirements.
For procurement and engineering use, the key items to verify are the complete ordering code, approval configuration, mounting dimensions, electrical interface, and weight of the exact supplied assembly. The typical 4 m system weight is 0.794 kg, but shipping weight and packaging dimensions should be treated separately.