190501-11-00-04 | Bently Nevada 3.94 mV/mm/s Velocity Transducer

Product Overview

When machinery vibration threatens uptime, the 190501-11-00-04 from Bently Nevada provides a dependable measurement solution. This Velomitor CT velocity transducer is engineered for continuous monitoring in demanding industrial environments. Its rugged 316L stainless steel case and certified intrinsically safe design make it a trusted choice for rotating equipment protection.

As a maintenance engineer, you need sensors that perform consistently. The 190501-11-00-04 delivers a sensitivity of 3.94 mV/mm/s (100 mV/in/s) with ±5% accuracy, ensuring precise velocity readings. Its frequency response covers 3.0 Hz to 900 Hz (±1.0 dB) and extends to 1.5 Hz to 1.0 kHz (±3.0 dB), capturing a wide range of machine vibration signatures.

Key Features & Technical Specifications

• Output bias voltage: 10.1 Vdc ± 1.0 Vdc, Pin A referenced to Pin B
• Dynamic output impedance: less than 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)
• Maximum cable length: 305 metres (1,000 ft) with no signal degradation
• 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: less than 0.0068 mm/s/gauss at 50 gauss, 50-60 Hz

The transducer's mounted resonant frequency is 9 kHz minimum (stud mounted, except quick disconnect), ensuring stable response in typical mounting configurations. Its transverse response is less than 5% of axial sensitivity, minimizing cross-axis errors.

Applications & Use Cases

The 190501-11-00-04 is ideal for vibration monitoring on pumps, fans, compressors, and motors. Its intrinsically safe approvals (Ex ia IIC T4, AEx ia IIC T4) allow installation in hazardous areas classified as Class I, Division 1, Groups A, B, C, D; Class II, Groups E, F, G; and Class III. This makes it suitable for oil refineries, chemical plants, and other process industries.

With a temperature sensitivity variation of -8% to +5% typical over the operating range, the transducer maintains accuracy across seasonal and process temperature swings. The 316L stainless steel case resists corrosion, extending service life in harsh environments.

Installation & Setup

Mounting the 190501-11-00-04 is straightforward. The plate stud option (3/8-in 24 to 1/4-in 28) provides a secure attachment. Apply the recommended mounting torque of 4.5 N-m ± 0.6 N-m (40 in-lbf ± 5 in-lbf) to ensure proper coupling. The transducer can be mounted in any orientation, simplifying installation in tight spaces.

The MIL-C-5015 connection interface (option 00) offers a reliable, industry-standard connector. Pin A goes positive with respect to Pin B when velocity is from base to top, ensuring correct phase interpretation. For hazardous area installations, follow the installation drawing 167536 as referenced in the approval documentation.

Maintenance & Reliability

Regular inspection of the transducer and its mounting is recommended to maintain measurement integrity. Check for any loosening of the stud or damage to the cable. The internal electronics are isolated from the case, reducing ground loop issues. With no moving parts, the Velomitor CT design offers long-term stability and minimal maintenance needs.

The transducer's 100% condensing humidity limit means it can operate in wet environments without submersion. Its shock limit of 5000 g pk ensures survival in high-impact scenarios, reducing the risk of unexpected failures.

Compatibility & Integration

The 190501-11-00-04 is compatible with Bently Nevada monitoring systems that accept velocity transducer inputs. Its output bias voltage and dynamic impedance are designed to interface with standard vibration monitoring equipment. The maximum cable length of 305 metres allows flexible placement of monitoring electronics away from the machine.

For replacement or upgrade projects, this transducer can directly replace older velocity sensors with similar electrical characteristics. Always verify compatibility with your existing system before installation.

Troubleshooting & Common Issues

If you encounter erratic readings, first check the mounting torque and ensure the stud is tight. Inspect the cable for damage, especially at connection points. Verify that the output bias voltage is within 10.1 Vdc ± 1.0 Vdc. If the signal is noisy, confirm that the cable is not routed near high-voltage lines or magnetic fields.

For persistent issues, consult the Bently Nevada documentation or contact Petro Auto Tech for technical support. Do not attempt internal repairs; the transducer is sealed and should be replaced if faulty.

FAQ

Q: What is the sensitivity of the 190501-11-00-04?

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

Q: What is the operating temperature range?

A: It operates from -40°C to +85°C (-40°F to +185°F).

Q: Can this transducer be used in hazardous areas?

A: Yes, it has intrinsic safety approvals including Ex ia IIC T4 and AEx ia IIC T4 for Class I, Division 1, Groups A, B, C, D.

Q: What is the maximum cable length?

A: The maximum cable length is 305 metres (1,000 ft) with no signal degradation.

Q: What mounting hardware is included?

A: The mounting hardware option is a plate stud 3/8-in 24 to 1/4-in 28.

Product Support & Availability

The Bently Nevada 190501-11-00-04 is available from Petro Auto Tech. Contact our team for current pricing and lead times. We are ready to assist with your vibration monitoring needs.