Bently Nevada 3300/35-03-01-00-00 Temperature Monitor | 6-Channel RTD System

3300/35-03-01-00-00 Six-Channel Temperature Monitor

The Bently Nevada 3300/35-03-01-00-00 delivers precision multi-point temperature surveillance for critical rotating machinery. Engineered for continuous monitoring of bearing assemblies, thrust collars, and process fluids, this six-channel RTD system provides early fault detection before thermal damage occurs in turbines, compressors, and motor-driven equipment.

Key Technical Parameters

• Part Number: 3300/35-03-01-00-00
• Input Channels: 6 independent RTD inputs
• Sensor Compatibility: 2-wire, 3-wire, and 4-wire RTD (Pt100, Pt1000)
• Temperature Range: -200 °C to +850 °C (-328 °F to +1562 °F)
• Accuracy: ±0.5 °C at 25 °C ambient
• Response Time: <2 seconds to 90% of step change
• Alarm Outputs: Dual setpoint relays per channel (Alert/Danger)
• Display: LED indicators for each channel status
• Power Requirements: 24VDC ±10%, 8W typical
• Rack Compatibility: 3300 Series standard chassis

Industrial Applications

Turbomachinery Protection: Monitor journal bearings, thrust bearings, and seal housings in steam turbines, gas turbines, and expanders where thermal gradients indicate lubrication failure or misalignment.

Compressor Monitoring: Track interstage temperatures, discharge gas temperatures, and bearing metal temperatures in centrifugal and reciprocating compressors to prevent catastrophic failures.

Motor & Generator Systems: Supervise stator windings, bearing housings, and cooling system temperatures in large electric motors and generators exceeding 500HP.

Pump Installations: Detect cavitation, seal degradation, and bearing wear through temperature trend analysis in critical process and boiler feed pumps.

Engineered Solutions

The 3300/35 module solves persistent challenges in thermal monitoring: multi-wire RTD support eliminates lead resistance errors common in long cable runs, independent channel isolation prevents cross-talk in high-density installations, and dual-setpoint alarming enables staged shutdown protocols compliant with API 670 machinery protection standards. The module’s self-diagnostic circuitry detects open sensors, short circuits, and out-of-range conditions, transmitting fault codes to DCS systems via 4-20mA outputs.

System Integration

Installation requires standard 3300 Series rack mounting with backplane power distribution. Each RTD input accepts shielded twisted-pair cables up to 300 meters without signal degradation. The module interfaces with SCADA systems through isolated 4-20mA current loops (one per channel) and provides Modbus RTU communication for digital integration. Alarm relay contacts are rated 5A at 250VAC for direct PLC interfacing or annunciator panel connection.

Product FAQ

Q: Can I use 2-wire RTDs with this monitor?
A: Yes, the module auto-detects 2-wire, 3-wire, and 4-wire configurations, though 3-wire or 4-wire connections are recommended for accuracy beyond ±1 °C.

Q: What happens if an RTD sensor fails during operation?
A: The channel immediately triggers a fault alarm, drives the 4-20mA output to 3.8mA (downscale), and illuminates the fault LED while other channels continue normal operation.

Q: Is this module compatible with thermocouples?
A: No, the 3300/35 is designed exclusively for RTD sensors; use the 3300/20 series for thermocouple applications.

Q: How do I calibrate alarm setpoints?
A: Setpoints are configured via front-panel DIP switches or digital interface; consult the configuration manual for specific temperature-to-switch position mapping.

Q: Does the unit support redundant power supplies?
A: Yes, when installed in a 3300 rack with dual power modules, the monitor automatically switches to backup power without interruption.

Quality Assurance & Warranty

Each unit undergoes factory burn-in testing and multi-point calibration traceable to NIST standards. Comprehensive 12-month warranty covers manufacturing defects and component failures. Technical documentation includes wiring diagrams, calibration certificates, and API 670 compliance statements.

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