Product Overview
When machinery speed monitoring is critical, the Bently Nevada 3500/50M-01-01 Tachometer Module delivers precision and reliability. Manufactured in the U.S.A., this module is designed for integration into the 3500 Monitoring System, accepting up to two transducer signals from proximity probes or magnetic pickups. With a typical power consumption of only 5.8 watts, it provides efficient, continuous operation for demanding industrial environments.
Key Features & Benefits
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Dual Input Channels: Accepts up to two transducer signals, enabling redundant speed measurement.
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Wide Input Range: Handles input signals from +10.0 V to -24.0 V, with internal limiting for out-of-range signals.
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Exceptional Accuracy: RPM accuracy of ±0.1 rpm below 100 rpm, ±1 rpm from 100 to 10,000 rpm, and ±0.01% of true shaft speed above 10,000 rpm.
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High-Speed Capability: Supports full-scale ranges up to 99,999 rpm and input frequencies up to 20 kHz.
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Flexible Event Support: Configurable 1 to 255 events per revolution for Rotor Acceleration and Zero Speed channels; 0.0039 to 255 events for other channel types.
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LED Status Indicators: OK, TX/RX, and Bypass LEDs provide immediate visual status.
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Agency Approval: cNRTLus (Class 1, Division 2) certified for hazardous locations.
Technical Specifications
| Parameter |
Value |
| Power Consumption |
5.8 W typical |
| Transducer Power Supply |
24 Vdc, 40 mA maximum per channel |
| Input Signal Range |
+10.0 V to -24.0 V |
| Input Impedance |
20 kΩ (standard), 40 kΩ (TMR), 7.15 kΩ (Internal Barrier) |
| Speed Input Range |
0.0039 to 255 events/revolution |
| Maximum Full Scale Speed |
99,999 rpm |
| Maximum Input Frequency |
20 kHz |
| Minimum Input Frequency (proximity) |
0.0167 Hz (1 rpm for 1 event/rev) |
| Minimum Input Frequency (magnetic pickup) |
3.3 Hz |
| RPM Accuracy |
<100 rpm: ±0.1 rpm; 100–10,000 rpm: ±1 rpm; >10,000 rpm: ±0.01% of true shaft speed |
| RPM/Min Accuracy |
±20 rpm/min |
| Monitor Module Dimensions (HxWxD) |
241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in) |
| Monitor Module Weight |
0.82 kg (1.8 lb) |
| I/O Module (non-barrier) Dimensions |
241.3 mm x 24.4 mm x 99.1 mm (9.50 in x 0.96 in x 3.90 in) |
| I/O Module (non-barrier) Weight |
0.20 kg (0.44 lb) |
| I/O Module (internal barrier) Dimensions |
241.3 mm x 24.4 mm x 163.1 mm (9.50 in x 0.96 in x 6.42 in) |
| I/O Module (internal barrier) Weight |
0.46 kg (1.01 lb) |
| Rack Space |
1 full-height front slot (monitor), 1 full-height rear slot (I/O) |
Industry Applications
The Bently Nevada 3500/50M-01-01 is ideal for rotating machinery protection in industries such as power generation, oil and gas, petrochemical, and water treatment. It excels in monitoring turbine speed, compressor RPM, and pump shaft speed. With its high accuracy and wide measurement range, it supports both low-speed and high-speed applications, ensuring reliable data for predictive maintenance and process control.
Installation & Setup
Integrating the 3500/50M-01-01 into an existing 3500 Monitoring System requires specific firmware and software versions: 3500/22M Module Firmware Revision 1.70, 3500/01 Configuration Software Version 4.20 or later, 3500/02 Data Acquisition Software Version 2.52 or later, 3500/03 Display Software Version 1.52 or later, and 3500/50M Firmware Revision 5.30 or later. The module is not compatible with any version of the 3500/20. Ensure the rack has one full-height front slot for the monitor module and one full-height rear slot for the I/O module. Connect transducers (proximity probes or magnetic pickups) to the designated input terminals, respecting polarity and signal range.
Maintenance & Reliability
Routine inspection of the 3500/50M-01-01 is straightforward. Check the OK LED to confirm proper operation; the TX/RX LED verifies communication with other modules, and the Bypass LED indicates bypass mode. Periodically verify input signal integrity and ensure transducer cables are properly shielded to avoid noise. The module's internal limiting protects against input overrange, but maintaining signal levels within the specified range extends service life. With no moving parts, the module offers high reliability and minimal maintenance, contributing to reduced downtime and lower total cost of ownership.
Compatibility & Integration
The Bently Nevada 3500/50M-01-01 Tachometer Module is designed to work seamlessly with the 3500 Monitoring System. It accepts signals from proximity probe transducers and magnetic pickups, making it versatile for various sensor types. The module supports both standard and TMR (triple modular redundant) configurations, with corresponding input impedance values. For hazardous area installations, the internal barrier option (7.15 kΩ impedance) is available. Ensure your system meets the firmware and software requirements listed above for optimal integration.
Selection Guide & Purchasing Advice
Before purchasing the Bently Nevada 3500/50M-01-01, verify that your existing 3500 system has the required firmware and software versions. Confirm the I/O module type (01 for internal terminations) and agency approval option (01 for cNRTLus Class 1, Division 2) match your application needs. Consider the number of channels required and the transducer types you plan to use. For further assistance or to place an order, PLC Source PRO offers genuine parts with reliable support. Always verify part numbers to ensure compatibility with your system.