330750-60-CN Bently Nevada High-temperature Velomitor Vibration Transducer System
Engineered specifically for extreme-heat industrial environments up to 400 °C, the Bently Nevada 330750-60-CN features an isolated sensor-to-cable architecture that keeps sensitive conditioning electronics safely outside the thermal zone. This unique design eliminates premature internal circuit failures caused by intense heat, solving the costly issue of frequent sensor replacements on heavy-duty machinery. With its 6-meter integrated hardline cable and 15 Hz to 2000 Hz frequency response, it is the ideal choice for continuous casing vibration monitoring on steam turbines, gas turbines, and turbochargers.
Technical Specifications
| Parameter Category |
Technical Specification |
Detailed Value / Condition |
| Electrical |
Scale Factor (Sensitivity) |
5.7 mV/mm/s (145 mV/in/s) ±5% |
|
Frequency Response |
15 Hz to 2000 Hz (±3.0 dB) |
|
Amplitude Linearity |
±6% up to 508 mm/s (20 in/s) velocity peak |
|
Transverse Sensitivity |
< 5% of axial sensitivity |
|
Broadband Noise Floor |
0.22 mm/s (0.009 in/s) pk (15 Hz to 2 kHz) |
|
Bias Voltage |
10.0 Vdc to 13.0 Vdc (referenced to pin A at 22 Vdc supply) |
| Environmental |
Sensing Head Operating Temp |
-55 °C to +400 °C (-67 °F to +752 °F) |
|
Hardline Cable Operating Temp |
-55 °C to +400 °C (-67 °F to +752 °F) |
|
Conditioning Electronics Temp |
-55 °C to +121 °C (-67 °F to +250 °F) |
|
Sealing (Sensing Head) |
100% Hermetically sealed |
|
Sealing (Electronics Case) |
100% Relative humidity (non-condensing with protective boot) |
| Mechanical |
Integral Cable Length |
6.0 meters (20 feet) hardline cable |
Key Features & Benefits
-
Sensing Head Operating Temp: -55 °C to +400 °C
Survives the brutal heat of gas turbine casings and steam piping without burning out, saving plants tens of thousands of dollars in frequent sensor replacements and premature downtime.
-
Integral Cable Length: 6.0 meters (20 feet) Hardline Cable
Allows the vulnerable processing electronics to be installed 20 feet away from the extreme heat source, keeping the circuit failure-free while removing the need to buy separate high-temperature extension cords.
-
Sealing (Sensing Head): 100% Hermetically sealed
Prevents hot steam, ambient moisture, and industrial oils from leaking into the sensor core, guaranteeing stable and reliable vibration readings for years even during steam leaks.
Engineer's Note: "When deploying the Bently Nevada 330750-60-CN, our field engineering team strongly advises against bending the 6-meter integrated hardline cable beyond its minimum 38.1 mm radius during installation. Because the hardline cable uses a mineral-insulated design to survive 400 °C, kinking it will permanently damage the internal conductors and cause immediate bias voltage faults on your 3500/42M monitor rack."
Project Case Study: "This exact 330750-60-CN model was successfully deployed for a major combined-cycle power plant in Indonesia. Installed directly onto the high-pressure casing of a Mitsubishi steam turbine, the sensors have operated flawlessly under continuous 380 °C thermal stress and 95% tropical ambient humidity, delivering uninterrupted vibration telemetry without a single signal drop."
Frequently Asked Questions
Q: Why does the 330750-60-CN use an integrated 6-meter cable instead of a standard detachable connector at the sensor head?
A: Standard electrical connectors quickly degrade, oxidize, or loosen under continuous 400 °C turbine temperatures. The 6-meter integrated armor hardline cable creates a seamless, hermetically sealed physical extension, allowing the delicate MIL-C-5015 connection point to be safely routed away to a cooler, low-vibration junction box.
Q: Can I connect the 330750-60-CN Velomitor directly to a standard PLC, or do I need a Bently Nevada monitor rack?
A: While it is native to the Bently Nevada 3500/42M or 1900/65A monitors, you can interface it with standard PLCs or SCADA systems. However, it requires a constant current source (2 to 10 mA) and a compatible zener safety barrier if deployed in hazardous gas environments.
Q: What is the practical difference indicated by the "CN" suffix on this specific Bently Nevada model?
A: The "CN" designator certifies that the hardware, packaging, and explosion-proof documentation comply with specific regional regulatory imports and safety standards (such as NEPSI/GB standards for China markets). It guarantees hassle-free customs clearance and compliance audits during plant safety inspections.
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The Amikon Benefit: 100% Original | Factory Sealed | Lowest Lead Times
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