Bently 330750-40 High Temperature Velomitor Transducer

Description

Bently 330750-40 High Temperature Velomitor Transducer

Product Dimensions：

The Bently Nevada 330750-40 is a specialized High-Temperature Velomitor System designed by Baker Hughes. It is engineered to measure casing vibration on machinery operating in extreme thermal environments, such as gas and steam turbines.

Product Detailed Description

Standard piezoelectric velocity sensors often fail when exposed directly to the extreme heat of turbine casings. The 330750 system solves this problem with a fundamentally unique design: it segregates the sensing head from the signal conditioning electronics.

The sensor head is mounted directly to the high-temperature surface, while an integrated, flexible hardline cable bridges the gap to the electronics, which are mounted a safe distance away in a cooler location. This hardline cable is permanently attached, eliminating standard connectors that are highly prone to thermal failure.

The -40 portion of the part number indicates a specific 4-meter (13.1 feet) integral cable length.

Technical Parameters

Product Advantages

• Extreme Temperature Tolerance: Able to continuously withstand surface temperatures up to +400^\circC, allowing measurements closer to the turbine hot sections than standard sensors.
• No Connectors at the Hot Zone: The permanent, hermetically sealed hardline cable eliminates loose connections or moisture ingress at the point of high heat.
• True Velocity Output: The internal electronics automatically integrate the raw piezoelectric acceleration signal into a velocity signal, reducing processing overhead on the monitoring system.
• High Ruggedness: The sensor head features an industrial-grade housing with extreme shock survivability (24,535 m/s^2 or 2500 g peak).

Important Considerations & Precautions

• Physical Handling: The hardline cable contains delicate internal conductors protected by a metal sheath. Do not kink, sharply bend, or twist the cable during installation. Ensure the minimum bend radius specified in the manual is strictly followed.
• Electronics Isolation: Ensure the signal conditioning electronics capsule is mounted in a location where temperatures stay reliably below +121^\circC.
• Casing Transmissibility: Casing vibration measurements are only effective if the internal rotor vibration is successfully transmitted to the external bearing housing or turbine casing. Ensure the sensor is rigidly mounted to a structural point, not thin sheet-metal guards.
• Grounding: To minimize electronic noise and ground loops in harsh industrial EMI environments, use double-shielded interconnect cables between the electronics block and the control room rack.

Product Applications

The 330750-40 is exclusively found in heavy power-generation and industrial processing assets:

• Gas Turbines: Monitoring casing and exhaust-frame vibration where temperatures easily exceed standard sensor limits.
• Steam Turbines: Positioned near labyrinth steam seals or main bearing housings prone to high-temperature steam leakage.
• Turbo-expanders: Used in petrochemical plants for machine protection against unbalance or misalignment.
• Hot Piping Systems: Tracking structural vibration on high-pressure, high-temperature fluid lines in refineries.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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