Description
Bently Nevada 3500/61-01-00 (163179-02)
Technical Specifications:
- Channels: Six independent temperature monitoring channels
- Signal Inputs: RTD (Pt100, 2-wire or 3-wire); Thermocouples (Types J, K, T, E, R, S, B, N) with onboard CJC
- Outputs: 4-20 mA recorder output on each of the six channels
- Alarm Setpoints: Per-channel Alert and Danger thresholds, programmable
- Communication: Via 3500 backplane; data accessible through 3500/22M TDI
- Power Requirements: Powered from the 3500 rack backplane
- Operating Temperature: -30°C to +65°C
- Storage Temperature: -40°C to +85°C
- Dimensions (H × W × D): 241.3 mm × 24.4 mm × 241.8 mm
- Weight: 0.91 kg
Functional Features:
- All six channels provide independent 4-20 mA proportional recorder outputs
- Supports mixing RTD and thermocouple sensor types across channels
- Per-channel Alert/Danger alarm processing with latching options
- Onboard Cold Junction Compensation for accurate thermocouple readings
- Compatible with 3500 system relay modules for trip logic and voting
- System 1 connectivity for historical trending and diagnostics
- Front-accessible module replacement
Application Scenarios:
- Applications requiring 4-20 mA temperature signals to external DCS or PLC systems
- Bearing temperature monitoring on compressors, turbines, and pumps
- Generator stator winding and bearing housing temperature monitoring
- Gas turbine exhaust and casing temperature tracking
- Lube oil system temperature monitoring with external recording
- Any installation where temperature data must be shared with legacy analog instrumentation
Performance Parameters:
- Measurement Accuracy: ±1°C at 25°C (standard rack); ±3°C at 25°C (blind-head rack)
- Input Impedance: Greater than 10 MΩ per lead input
- Power Consumption: 9 Watts
- Recorder Output: 4-20 mA per channel, proportional to measured temperature
Material Composition: Industrial-grade electronic components in a standard 3500 rack module enclosure
Structural Features: Single-slot front plug-in monitor with matching rear I/O module. The rear I/O provides both sensor input terminals and 4-20 mA output terminals for each of the six channels.
Working Principle: The module conditions RTD and thermocouple signals, converts them to digital temperature values, and simultaneously generates proportional 4-20 mA analog outputs for each channel. The digital values are compared against user-programmable alarm setpoints to drive protection alarms. The analog outputs provide continuous temperature representation to external systems independent of the digital communication path.
Installation Requirements:
- Install in a Bently 3500 rack within an IP-rated cabinet
- Provide clean, dry air circulation
- Land sensors on the rear I/O module maintaining proper polarity
- Use shielded cables for both sensor inputs and 4-20 mA output wiring
- Ensure proper grounding to prevent ground loop interference
- Route 4-20 mA output cables away from high-voltage power cables
Usage Notes:
- The 3500/61 is the preferred choice over the 3500/60 when 4-20 mA recorder outputs are needed
- De-energize circuits before servicing
- Observe ESD handling procedures
- Verify readings against a reference annually
- Check terminal tightness and review event logs regularly
- The 4-20 mA outputs are proportional to the measured temperature and can be configured for the desired temperature range
