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Bently Nevada 167669-02 1900/65A Universal Device Monitor
The Bently Nevada 167669-02, also cataloged as the 1900/65A Universal Device Monitor, serves as the primary standalone condition monitoring unit utilized to execute multi-channel vibration, position, speed, and temperature acquisition across compact machinery protection architectures within the 1900/65A monitoring platform.
Suffix Breakdown & Model Matrix
No manufacturer-defined functional suffix decomposition is published for 167669-02. The identifier represents a fixed configuration hardware variant within the 1900/65A Universal Device Monitor family.
Hardware Specifications
| Parameter |
Specification |
| Model |
167669-02 |
| Brand |
Bently Nevada |
| Origin |
USA |
| Weight |
7.7 kg |
| Dimensions |
19.6 × 16 × 10.8 cm |
| Transducer Inputs |
4 channels (vibration / position / speed) |
| Temperature Inputs |
4 channels (RTD or thermocouples Type E, J, K, T) |
| Relay Outputs |
6 programmable SPDT relays |
| Analog Outputs |
4 × 4-20 mA |
| Buffered Output |
1 × BNC diagnostic output |
| A/D Resolution |
24-bit |
| Communication Interfaces |
Modbus RTU/TCP via RS232 / RS485 / Ethernet 10/100BASE-T |
| Power Input |
18–36 VDC or 110–220 VAC (external supply dependent) |
| Mounting |
DIN rail or bulkhead |
Bently Nevada Multi-Channel Signal Processing & Relay Logic Execution Behavior
Within the 1900/65A architecture, the 167669-02 performs simultaneous acquisition of vibration and temperature signals using independent analog front-end paths. The 24-bit A/D conversion pipeline supports high-resolution waveform reconstruction for vibration, velocity, and speed-related transducer inputs.
The module executes onboard alarm logic independent of external PLC/DCS systems. Relay outputs are directly driven by configurable threshold comparisons across vibration and temperature channels, enabling local trip or alert signaling without supervisory dependency.
Modbus communication channels operate asynchronously relative to local protection logic, ensuring that data streaming to SCADA systems does not interfere with real-time relay execution paths. Buffered BNC output provides direct analog signal access for external diagnostic instrumentation without interrupting internal processing loops.
Frequently Asked Questions (FAQ)
Q: Can the 167669-02 operate without a PLC or DCS connection?
A: Yes. The device executes local monitoring and relay-based protection logic independently. Communication is only required for data acquisition or supervisory integration.
Q: Are vibration and temperature channels sampled using the same A/D path?
A: No. Vibration/position channels and temperature channels are processed through separate input conditioning paths prior to 24-bit digitization.
Q: What is the behavior of relay outputs during power interruption?
A: Relay states default to their fail-safe configuration during loss of supply, depending on programmed logic and internal watchdog status.
Field Installation Guidelines
Install the unit using DIN rail or approved bulkhead mounting to ensure mechanical stability under vibration conditions. Maintain separation between low-level sensor wiring and power conductors to reduce electromagnetic coupling. Shielded cable termination must be grounded at a single-point reference to prevent ground loop formation across vibration sensor circuits.
For Modbus and Ethernet communication, use properly terminated twisted-pair cabling and avoid routing parallel to high-current switching lines. Ensure enclosure protection rating matches environmental exposure conditions when deployed in dust or moisture-prone areas. Verify channel configuration and relay mapping prior to system commissioning.
