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        330752-25-CN

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        The Bently Nevada 330752-25-CN High Temperature Velomitor sensor is a specialized vibration measurement device engineered specifically for extreme industrial environments.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 330752-25-CN

        • Manufacturer:
          Bently Nevada
        • Part Number:
          330752-25-CN
        • Product Family:
          330750 / 330752 High Temperature Velomitor System
        • Product Type:
          High Temperature Velomitor sensor
        • Length:
          2.5 meters
        • Sensitivity:
          5.7 mV/mm/s (145 mV/in/s) ±5%
        • Amplitude Range:
          635 mm/s (25 in/s) peak below 680 Hz; 2940 m/s² (300 g) peak above 680 Hz (reduced above 2 kHz)
        • Transverse Sensitivity:
          Less than 5% of Sensitivity
        • Amplitude Linearity:
          ±2% to 152 mm/s (6 in/s) peak
        • Mounted Resonant Frequency:
          Greater than 5 kHz
        • Output Bias Voltage:
          -12 ±2.0 VDC
        • Broadband Noise Floor:
          0.127 mm/s (0.005 in/s) rms nominal (15 Hz to 2 kHz)
        • Maximum Cable Length:
          305 meters (1000 feet) with no degradation of signal
        • Weight:
          0.64 kg
        • Estimated shipping dimensions:
          8537101190
        • Tariff Code:
          15 × 15 × 5 cm
        • Country of origin:
          USA
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Use Cases Communication & Connectivity Monitoring & Control

        Features:

        • High Temperature Velocity Sensing for Surfaces up to +400°C (+752°F)
        • Segregated Design with 2.5-Meter Integrated Cable Eliminates Connector Failure Points
        • Multiple Hazardous Area Approvals Including CSA, ATEX, and IECEx
        The 330752-25-CN operates as the High Temperature Velomitor Sensor in industrial machinery monitoring systems, providing reliable velocity measurement on machinery surfaces with temperatures up to +400°C (+752°F). It continuously captures vibration data through the piezo-electric sensing element and transmits this signal through a 2.5-meter integral cable to support steady state monitoring of rotating equipment in extreme thermal environments. Reliable high-temperature velocity measurement is standard with the 330752-25-CN, however using the segregated transducer design allows the sensing head to survive extreme thermal conditions in the event of surface temperatures reaching +400°C (+752°F). The 330752-25-CN has made improvements in several areas over previous High Temperature Velomitor designs in addition to incorporating enhanced +400°C thermal capability within the Bently Nevada sensor lineup. Current versions capable of measuring up to +400°C (+752°F) are identified by serial numbers preceded by the letter "G," distinguishing them from earlier versions limited to +300°C (+572°F).

        The 330752-25-CN provides essential vibration sensing functions critical to machinery protection systems, and is a vital component of the monitoring path, directly affecting the accurate detection of machine health conditions in high-temperature environments. One 330752-25-CN sensor is required per measurement point depending on the desired monitoring coverage. The 330752-25-CN mounts directly on the machine surface and is always located at the designated measurement position (typically bearing housings or machine casings exposed to extreme heat, the dedicated high-temperature sensing locations).

        For extreme high-temperature applications, the 330752-25-CN utilizes a segregated design configuration that permanently separates the sensing element from the signal conditioning electronics. In addition to standard velocity measurement capability, the separated configuration also performs thermal protection for the internal electronics. The 330752-25-CN dual-component architecture executes thermal isolation using the integrated cable specified in the transducer design. Using this method, the high-temperature sensor system continually maintains the signal conditioning electronics in a cooler location remote from the sensing head. If the machinery surface temperature exceeds safe operating limits for standard sensors (outside +121°C tolerance levels), the 330752-25-CN will continue providing accurate velocity measurement through the remote electronics and deliver reliable machinery performance data to the monitoring system. The internal electronics withstands temperatures of -55°C to +121°C (-67°F to +250°F) when positioned in the cooler location away from the heat source.

        The 330752-25-CN Bently Nevada High Temperature Velomitor sensor may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Bently Nevada 330752-25-CN High Temperature Velomitor sensor Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        Bently Nevada 330752-25-CN High Temperature Velomitor sensor Specs

        General

        • Manufacturer Bently Nevada
        • Model 330752-25-CN
        • Condition New Original ready stock
        • Product Family 330752-25-05,330752-40-CN
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Gas & Steam Turbine Hot Ends: Tracks casing-related vibration, structural resonances, and cross-axis mechanical forces near exhaust framing or combustion chambers.
        • Industrial Boiler Feed Pumps: Monitors bearing housing instability, impeller imbalance, and high-heat thermal expansions.
        • Exhaust and Draft Fans: Evaluates shaft misalignment and structural wear inside high-velocity, high-temperature flue gas pathways.
        • Large Process Compressors: Minimizes catastrophic casing failure risks by detecting early signs of rotor friction or oil-whirl anomalies.
        • Integral Hardline Cable Connection: Connects the core sensor head to its processing electronics via a seamless, connectorless 2.5-meter cable, eliminating traditional plug-end thermal failures.
        • Standard Terminal Termination: Transmits its conditioned electrical output using a robust, hermetically-sealed 2-pin MIL-C-5015 receptacle encased in 304 stainless steel.
        • Interconnect Distance: Relays analog signals up to 305 meters (1,000 feet) over shielded, armored twisted-pair field cabling without signal attenuation or data loss.
        • Signal Format: Emits an analog raw dynamic voltage wave where Pin A shifts positive in direct proportion to real-time machine casing velocity.
        • Signal Integration Processing: Uses the segregated transmitter module to translate high-heat seismic acceleration vectors directly into a clear 5.7 mV/mm/s (145 mV/in/s) velocity metric.
        • Machinery Protection Alignment: Pairs directly with industrial protection modules such as the Bently Nevada 3500 Series Monitoring System to trigger automated safety interlocks and alarms.
        • Data Loop Interfacing: Supplies conditioned velocity loops to plant-wide Distributed Control Systems (DCS) and Programmable Logic Controllers (PLCs) via analog input terminals.
        • Vibration Precision Band: Scans a frequency window of 15 to 2,000 Hz to isolate subtle mechanical problems like looseness, structural cracks, and early rolling-element bearing degradation.
        Description
        The Bently Nevada 330752-25-CN High Temperature Velomitor Sensor is specifically engineered to handle extreme thermal conditions in industrial vibration monitoring applications, solving the critical problem of reliable velocity measurement on machinery surfaces that reach temperatures up to +400°C (+752°F). This 330752-25-CN sensor comes equipped with a 2.5-meter integral cable and carries multiple international approvals, including CSA, ATEX, and IECEx, making it ideal for deployment in demanding environments such as gas turbines, steam turbines, and other high-temperature rotating equipment where conventional sensors cannot survive.

        To accomplish this exceptional thermal performance, the 330752-25-CN utilizes a segregated transducer design that permanently isolates the sensing element from the signal conditioning electronics, with the two components connected through an integrated cable. The 330752-25-CN's integrated cable eliminates external connectors, which represent a significant source of transducer failures, while enabling you to position the internal electronics in a cooler location remote from the intense heat source. The signal conditioning electronics within the 330752-25-CN withstand temperatures ranging from -55°C to +121°C (-67°F to +250°F). Please note that current versions of the 330752-25-CN capable of operating up to +400°C (+752°F) are identified by serial numbers preceded by the letter "G," distinguishing them from earlier versions limited to +300°C (+572°F).

        Through this integrated architecture, the 330752-25-CN captures machinery performance data comparable to other standard Bently Nevada Velomitor transducers, but at significantly higher operating temperatures. For lower-temperature environments where conditions do not exceed +121°C (+250°F), the standard 330500 Velomitor Piezo-velocity Sensor serves as an appropriate alternative. When your application requires accurate, continuous vibration monitoring in extreme heat beyond the capabilities of standard velocity sensors, the 330752-25-CN delivers the robust, high-temperature solution necessary for protecting critical rotating machinery.
        Alternative Names
        330752 25 CN 330752-25-05 330752-40-CN 330752-60-CN 330752-80-CN
        Technical notes
        This 330752-25-CN sensor features a 2.5-meter integral cable and carries multiple international certifications, including CSA, ATEX, and IECEx approvals, ensuring safe operation in hazardous areas. To achieve its high-temperature capability, the 330752-25-CN utilizes a segregated transducer design that physically separates the sensing element from the signal conditioning electronics. These two core components of the 330752-25-CN are permanently joined by the integrated cable, a design choice that successfully eliminates connectors, which are a major source of traditional transducer failures.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        What is the Bently Nevada 330752-25-CN used for?
        The 330752-25-CN is a vibration sensor designed for monitoring machinery in extreme-temperature industrial environments. It measures vibration velocity on critical rotating equipment where standard sensors cannot tolerate elevated surface temperatures.
        What makes the 330752-25-CN different from standard vibration sensors?
        This model is specifically designed for high-temperature operation. It uses a separated transducer architecture that isolates the sensing element from the signal conditioning electronics, allowing reliable measurement on very hot machinery surfaces.
        Why are the electronics separated from the sensing head?
        Separating the electronics protects sensitive components from extreme heat. The cable allows the electronics to be installed in a cooler location while the sensing element remains at the hot machine surface.
        What problem does the 330752-25-CN solve?
        It solves the issue of vibration sensor failure in high-temperature areas where conventional transducers would degrade, lose signal quality, or fail prematurely.

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