- The Bently Nevada 190501-12-99-02 is a 2-wire, loop-powered Velomitor CT Velocity Transducer. It is a passive electromagnetic sensor that directly measures absolute casing vibration and converts it into a proportional 4–20 mA signal for seamless integration with PLC, DCS, or SCADA systems.
- Precise Vibration Monitoring: Delivers accurate velocity measurements to detect early signs of machinery faults such as imbalance, misalignment, and bearing wear, preventing catastrophic failures.
- Loop-Powered Simplicity: Operates directly from the 4–20 mA current loop, requiring no additional power supply and simplifying field wiring.
- Rugged & Reliable: Hermetically sealed, stainless steel design withstands extreme temperatures, high humidity, and corrosive atmospheres.
- Hazardous Area Certified: Features global approvals (ATEX, CSA) for safe operation in explosive gas and dust environments.
- Easy Integration: Standard 4–20 mA output ensures compatibility with all modern control systems, reducing implementation costs.
Technical Specifications & Order Code Breakdown
Model Code Explanation (190501-12-99-02)
- 190501: Base model – Velomitor CT Velocity Transducer
- 12: Mounting – Plate Stud, 3/8-24 UNF to M8x1 conversion
- 99: Connection – Factory-installed 32 ft (9.75 m) armored cable
- 02: Approvals – CSA (NRTL/C) & ATEX/IECEx for hazardous locations
Key Performance Parameters
- Sensitivity: 3.94 mV/mm/s (100 mV/in/s) ±5%
- Frequency Response: 3 Hz to 900 Hz (±1 dB)
- Measurement Range: 0 to 63.5 mm/s (0 to 2.5 in/s) peak
- Linearity: ±2% full scale
- Dynamic Range: 80 dB
- Isolation Voltage: 1500 V RMS
- Output: 4–20 mA (proportional to velocity)
- Loop Power: 12–35 VDC
Environmental Ratings
- Operating Temperature: -40°C to +85°C (-40°F to +185°F)
- Shock Resistance: 5000 g peak
- Humidity: 100% condensing
- Ingress Protection: Hermetically sealed (IP67 equivalent)
- Housing Material: 316L Stainless Steel
- Weight: 297 g (10.5 oz)
- Dimensions: 33 mm diameter x 82 mm height
Installation & Mounting Best Practices
Proper Mounting Procedure
- Surface Preparation: Ensure the mounting surface on the machine casing is clean, flat, and free of paint, rust, or burrs to ensure optimal mechanical transfer of vibration.
- Torque Specification: Tighten the M8x1 stud to a torque of 4.5 N·m ± 0.6 N-m (40 ± 5 in-lb). Over-tightening can stress the sensor and affect calibration.
- Orientation: Mount the transducer vertically (cable pointing down) whenever possible to prevent moisture ingress along the cable.
- Location: Install as close as possible to the bearing housing to capture the most representative vibration signal.
Wiring & System Integration
- Cable Management: The integral 32-foot cable is armored; avoid sharp bends and secure it away from moving parts and high-voltage power cables to minimize EMI.
- Polarity: Observe correct polarity when connecting to the control system. Pin A is the signal (+), Pin B is the return (-).
- Loop Resistance: Ensure the total loop resistance (cable + system input) does not exceed the maximum limit for the applied voltage to maintain accurate 4–20 mA communication.
Buyer’s Guide FAQ
Is the 190501-12-99-02 suitable for use in hazardous areas?
Yes. The
-02 suffix signifies that this unit carries ATEX/IECEx and CSA (NRTL/C) intrinsic safety approvals. It is certified for use in Class I, Division 1, Groups A, B, C, D and Class II, Division 1, Groups E, F, G hazardous locations.What is the recommended calibration interval?
Bently Nevada recommends recalibrating the Velomitor CT every 2 years to ensure measurement accuracy.
Can this sensor be used with any monitoring system?
Yes. It provides a universal, loop-powered 4–20 mA output that is compatible with virtually all industrial PLCs, DCS, and stand-alone vibration monitors.
What is the difference between this and an accelerometer?
A velocity transducer like the 190501 measures velocity (mm/s or in/s), which is the industry standard for assessing overall machinery health. An accelerometer measures acceleration (g's), which is more suited for high-frequency analysis of bearing defects.
