Product Overview
The Bently Nevada 3500/61-01-00 is a Temperature Monitor with Recorder Outputs, designed for use in industrial rotating machinery protection systems. This module accepts from 1 to 6 RTD or TC transducer signals, providing accurate temperature monitoring and recording capabilities. Manufactured in the USA, the 3500/61-01-00 features a non-isolated I/O module with internal terminations (option 01) and no agency approval option (00). It is a critical component for ensuring reliable operation of turbines, compressors, and other critical assets.
Key Features
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Versatile Input Support: Accepts up to 6 RTD or TC inputs, including Type E, J, K, T thermocouples and 100Ω platinum, 120Ω nickel, and 10Ω copper RTDs.
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High Input Impedance: 10 MΩ per lead input minimizes loading effects on sensors.
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Low Power Consumption: Nominal consumption of 9 watts for the 3500/61 model.
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Isolation: System isolation of 500 Vdc and channel-to-channel isolation of 250 Vdc (for isolated I/O modules).
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Recorder Outputs: Provides +4 to +20 mA outputs proportional to full-scale, one per channel.
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Flexible Configuration: Full-scale ranges and alarm setpoints are software-configurable via 3500 Configuration Software; no calibration required.
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Comprehensive Diagnostics: Front panel LEDs for OK, TX/RX, and Bypass status.
Technical Specifications
| Parameter |
Value |
| Inputs |
1 to 6 RTD or TC signals |
| Input Impedance |
10 MΩ per lead |
| Power Consumption |
9 W (nominal) |
| Thermocouple Types |
E: -100°C to +1000°C; J: -18°C to +760°C; K: -18°C to +1370°C; T: -160°C to +400°C |
| RTD Types |
100Ω platinum (α=0.00385): -200°C to +850°C; 100Ω platinum (α=0.00392): -200°C to +700°C; 120Ω nickel: -80°C to +260°C; 10Ω copper: -100°C to +260°C |
| Recorder Output |
+4 to +20 mA (proportional to full-scale) |
| Voltage Compliance |
0 to +12 Vdc, load 0 to 600 Ω |
| Resolution |
0.3662 µA per bit ±0.15% error at room temperature |
| Accuracy (RTD/TC) |
±3°C at 25°C (non-isolated internal termination) |
| Alarm Setpoints |
Adjustable 0-100% of full-scale, accuracy within 0.13% |
| Alarm Delays |
Alert: 1-60 sec (1-sec intervals); Danger: 1-60 sec (0.5-sec intervals) |
| Operating Temperature |
-30°C to +65°C (with internal/external termination I/O) |
| Storage Temperature |
-40°C to +85°C |
| Dimensions (Monitor Module) |
241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in) |
| Weight (Monitor Module) |
0.91 kg (2.0 lb) |
| Rack Space |
1 full-height front slot (monitor), 1 full-height rear slot (I/O) |
Real-World Applications
The Bently Nevada 3500/61-01-00 excels in industries where precise temperature monitoring is critical for asset protection. Typical applications include:
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Turbo Machinery Monitoring: Monitor bearing temperatures and case temperatures in steam turbines, gas turbines, and compressors. The module's ability to accept 6 inputs allows comprehensive coverage of multiple temperature points.
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Generators and Motors: Track stator winding and bearing temperatures in large electric motors and generators, preventing overheating and insulation failure.
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Pumps and Fans: In critical pumping and ventilation systems, the 3500/61-01-00 provides early warning of rising temperatures, enabling predictive maintenance and avoiding unplanned downtime.
Installation & Setup
Proper installation ensures optimal performance. The 3500/61-01-00 mounts in a Bently Nevada 3500 rack, occupying one full-height front slot. The corresponding I/O module (option 01) occupies one full-height rear slot. Connect RTD or TC sensors to the I/O module terminals per the wiring diagram. For 3-wire RTDs, ensure the two current sources are properly connected; for 4-wire, use the single supply. Configure the monitor using the 3500 Configuration Software: set full-scale ranges, alarm setpoints, and delays. No manual calibration is required. Always follow standard industrial safety practices and ensure the system is de-energized during installation.
Maintenance & Reliability
The 3500/61-01-00 is designed for long-term reliability. To maintain accuracy and dependability, follow these guidelines:
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Routine Inspection: Periodically check the front panel LEDs. A steady OK LED indicates normal operation; TX/RX LED blinks during communication; Bypass LED indicates bypass mode. Investigate any unexpected LED states.
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Environmental Limits: Operate within -30°C to +65°C when using internal/external termination I/O modules. Storage range is -40°C to +85°C. Avoid condensation and excessive vibration.
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Sensor Checks: Verify RTD/TC connections and lead integrity. The 10 MΩ input impedance minimizes loading, but damaged wiring can affect readings.
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Recorder Outputs: Short circuits on recorder outputs do not affect monitor operation, but check output loads stay within 0-600 Ω to maintain voltage compliance.
Selection Guide
When sourcing the Bently Nevada 3500/61-01-00, confirm your system requirements: the I/O module type (01 = RTD/TC non-isolated internal terminations) and agency approval option (00 = none) are predetermined by the part number. Ensure you have the compatible 3500 rack and configuration software. For genuine, ready-to-ship automation spares, PLC Source PRO offers reliable sourcing and fast delivery. Verify the part number and condition before ordering to ensure seamless integration.