Description
The Bently Nevada 330750-60-CN (often ordered with suffix options like -05 for agency approvals) is a specialized high-temperature seismic vibration monitoring transducer system. It measures absolute casing velocity for critical rotating machinery operating in extreme thermal environments, such as gas turbines, compressors, and large pumps where standard velocity sensors fail due to electronic temperature limits.
Technical Specifications
| Parameter | Value |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Product Type | High-Temperature Velomitor System (HTVS) |
| Model / Ordering Suffix | 330750-60 (6-meter integral hardline cable length configuration) |
| Sensing Head Temperature Limit | Up to +400 °C (+752 °F) |
| Signal Conditioner Temperature Limit | −55 to +121 °C (−67 to +250 °F) |
| Sensitivity | 5.7 mV/mm/s (145 mV/in/s) \pm5% |
| Frequency Response | 15 to 2,000 Hz (\pm3.0 dB); 20 to 1,000 Hz (\pm0.9 dB) |
| Amplitude Range | Up to 635 mm/s (25 in/s) peak below 680 Hz |
| Interconnect Design | Permanent hardline cable separating the piezoelectric sensing element from signal conditioning electronics |
| Hazardous Area Approvals | CSA, ATEX, IECEx (dependent on exact regional suffix code) |
Availability and Commercial Terms
- Condition: New Surplus / Factory Original (verify exact date code and packaging condition prior to site mobilization)
- Lead Time: 1 to 3 business days for standard inventory items; factory allocations may vary up to several weeks depending on global stock
- Warranty: 12-month standard hardware replacement warranty
- Pricing Note: Listed price is indicative, not final. Price subject to market conditions; contact us for a firm quote.
Field Integration and Operational Notes
In field deployments on high-temperature casings, the 330750 system isolates the sensitive signal conditioning electronics from the high-heat measurement point by using a rigid or semi-flexible hardline cable. Mount the remote electronics box in an area where ambient temperature stays below +121 °C (+250 °F).
Ensure the physical mounting base is flat, spot-faced, and torqued to manufacturer specifications using the recommended mounting stud to prevent high-frequency signal attenuation or false high-amplitude spikes. Avoid routing the hardline cable near high-vibration structural elements without using proper clamping to eliminate secondary cable fatigue failure.
Frequently Asked Questions
Q: What is the significance of the 6-meter length designation in the 330750-60 part number?
A: The “-60” suffix specifies a total integral hardline cable length of 6 meters, allowing installers to route the cable from a high-temperature machine surface down to a cooler junction or electronics mounting location.
Q: Can the hardline cable be spliced or field-cut if it is too long?
A: No. The hardline cable is permanently factory-sealed and matched to the sensing head and internal electronics. Cutting or splicing the cable will disrupt the electrical calibration and invalidate the transducer output.
Q: How does this differ from a standard 330500 Velomitor?
A: Standard Velomitor units house their signal conditioning electronics directly inside the main sensor body, restricting their maximum operating environment to +121 °C (+250 °F). The 330750 separates the core sensor from the electronics via a hardline cable to safely operate up to +400 °C.
