190501-04-00-04 | Bently Nevada 3.94 mV/mm/s Velomitor CT Transducer

Overview of the Bently Nevada 190501-04-00-04 Velomitor CT Velocity Transducer

When rotating machinery demands precise vibration monitoring, the 190501-04-00-04 from Bently Nevada provides a dependable solution. This Velomitor CT velocity transducer converts mechanical velocity into an electrical signal, enabling early detection of bearing wear, unbalance, and misalignment. Its robust design suits harsh industrial environments, offering consistent performance across a wide temperature range.

With a sensitivity of 3.94 mV/mm/s (±5%), the transducer delivers accurate readings essential for predictive maintenance programs. The unit operates from 3.0 Hz to 900 Hz (180 to 54,000 cpm) within ±1.0 dB, and extends to 1.5 Hz to 1.0 kHz (90 to 60,000 cpm) within ±3.0 dB. This frequency response covers typical machine vibration signatures, making it a versatile choice for fans, pumps, motors, and gearboxes.

Engineers appreciate the 190501-04-00-04 for its ease of integration. The MIL-C-5015 connection interface simplifies wiring, while the mounting hardware option (stud M6x1 with 3/8-in 24 adapter) offers flexibility. The transducer's internal electronics are isolated from the case, reducing ground loop issues. Moreover, the unit is CSA/NRTL/C (Class I, Division 1) and ATEX/IECEx/CSA (Class I, Zone 0/1) approved, ensuring suitability for hazardous areas.

Key Features and Technical Specifications

• Sensitivity: 3.94 mV/mm/s (100 mV/in/s) ±5%.
• Frequency Response: 3.0 Hz to 900 Hz (180 to 54,000 cpm) ±1.0 dB; 1.5 Hz to 1.0 kHz (90 to 60,000 cpm) ±3.0 dB.
• Output Bias Voltage: 10.1 Vdc ± 1.0 Vdc, Pin A referenced to Pin B.
• Dynamic Output Impedance: <400 Ω typical.
• Broadband Noise: 0.229 mm/s (0.009 in/s) pk.
• Base Strain Sensitivity: 0.43 mm/s/μstrain (0.017 in/s/μstrain).
• Operating Temperature: -40°C to +85°C (-40°F to +185°F).
• Shock Limit: 5000 g pk, maximum.
• Humidity Limit: 100% condensing, non-submerged.
• Magnetic Field Susceptibility: <0.0068 mm/s/gauss (0.268 mil/s/gauss) @ 50 gauss, 50-60 Hz.
• Weight: <297 g (10.5 oz.), typical.
• Case Material: 316L stainless steel.
• Connector: 2-pin 316L stainless steel MIL-C5015, top.

One standout feature is the transducer's low base strain sensitivity of 0.43 mm/s/μstrain. This means that mechanical strain on the mounting surface has minimal effect on the vibration reading, ensuring accurate data even when the machine casing flexes. This is critical for reliable condition monitoring in real-world installations.

Applications and Use Cases

The 190501-04-00-04 is ideal for permanent vibration monitoring on rotating equipment. Common applications include pumps, compressors, turbines, and electric motors. Its hazardous area approvals make it suitable for oil and gas, chemical, and pharmaceutical plants where explosive atmospheres may exist.

Because the transducer measures absolute velocity, it is particularly effective for detecting unbalance and misalignment at low to medium frequencies. The wide operating temperature range allows installation in outdoor or unheated environments. Additionally, the 100% condensing humidity rating means the unit can withstand moisture without performance degradation, which is beneficial in washdown areas or humid climates.

For maintenance teams, the 190501-04-00-04 provides a cost-effective way to implement condition-based monitoring. By catching developing faults early, you can schedule repairs during planned outages, avoiding costly unplanned downtime. The transducer's long-term stability reduces the need for frequent recalibration, further lowering total cost of ownership.

Installation and Mounting Guidance

Proper installation is essential for accurate vibration measurement. The 190501-04-00-04 features a stud M6x1 mounting option with a 3/8-in 24 adapter, allowing secure attachment to flat machine surfaces. Ensure the mounting surface is clean and flat to achieve optimal coupling.

Apply the recommended mounting torque of 4.5 N-m ± 0.6 N-m (40 in-lbf ± 5 in-lbf) to avoid over-tightening, which could distort the case and affect readings. The transducer can be mounted in any orientation, simplifying installation in tight spaces. Use the MIL-C-5015 connector for a reliable electrical connection, and route the cable away from high-voltage sources to minimize interference.

Maximum cable length is 305 meters (1,000 ft.) with part number 02173006, allowing remote placement of monitoring electronics without signal degradation. Always follow the manufacturer's installation drawing (167536) for hazardous area installations to maintain safety compliance.

Maintenance and Reliability

The 190501-04-00-04 is designed for long-term, maintenance-free operation. Its 316L stainless steel case resists corrosion, and the internal electronics are sealed against moisture. Periodic inspection of the mounting integrity and cable condition is recommended to ensure consistent performance.

Given its rugged construction and high shock limit (5000 g pk), the transducer withstands harsh industrial vibrations. The temperature sensitivity variation of -8% to +5% over the operating range is minimal, so readings remain stable across seasonal changes. This reliability translates into fewer false alarms and more accurate trend data, supporting effective predictive maintenance strategies.

For safety-rated installations, always follow the manufacturer's manual for inspection intervals and verification procedures. Regular checks of the output bias voltage (10.1 Vdc ± 1.0 Vdc) can confirm the transducer is functioning correctly.

Comparison with Similar Transducers

Compared to standard piezoelectric accelerometers, the Velomitor CT offers a direct velocity output without needing external integration. This simplifies signal conditioning and reduces the chance of integration errors. Unlike some velocity sensors that require a separate power supply, the 190501-04-00-04 includes built-in electronics, providing a biased output ready for connection to a monitoring system.

When compared to other Bently Nevada velocity transducers, the 190501-04-00-04 stands out for its combination of high sensitivity and broad frequency range. Its hazardous area approvals (ATEX/IECEx/CSA) make it a preferred choice for global installations. The low base strain sensitivity also gives it an edge in applications where casing deformation is a concern.

Frequently Asked Questions

Q: What is the sensitivity of the 190501-04-00-04?

A: The sensitivity is 3.94 mV/mm/s (100 mV/in/s) ±5%.

Q: What is the operating temperature range?

A: The operating temperature range is -40°C to +85°C (-40°F to +185°F).

Q: Is the transducer suitable for hazardous areas?

A: Yes, it has CSA/NRTL/C (Class I, Division 1) and ATEX/IECEx/CSA (Class I, Zone 0/1) approvals.

Q: What is the maximum cable length?

A: The maximum cable length is 305 meters (1,000 ft.) with part number 02173006.

Q: What mounting torque is recommended?

A: The recommended mounting torque is 4.5 N-m ± 0.6 N-m (40 in-lbf ± 5 in-lbf).

Product Support and Availability

The Bently Nevada 190501-04-00-04 is available through Petro Auto Tech, your trusted industrial automation parts supplier. We maintain a stock of this transducer to meet your maintenance and project needs. Contact our team for current pricing and lead times.

For technical assistance or to verify lifecycle status, please reach out to Petro Auto Tech. We are committed to helping you keep your machinery running smoothly with genuine, high-quality components.