Key Technical Specifications
| Parameter | Detail |
|---|---|
| Product Type | General Purpose Equipment Monitor |
| Manufacturer | Bently Nevada (GE / Baker Hughes) |
| Model | 1900/65A-00-00-02-00-01 |
| Vibration Inputs | 4 channels (2-wire/3-wire accelerometers, velocity sensors, proximity sensors) |
| Temperature Inputs | 4 channels (E, J, K, T-type thermocouples; 2-wire/3-wire RTDs) |
| ADC Resolution | 24-bit |
| Bandwidth | 25 kHz |
| Alarm Levels | 2-level: Alert and Danger |
| Relay Outputs | 6 configurable relays with voting logic |
| Analog Outputs | 4 configurable 4–20 mA recorder outputs |
| Buffered Outputs | 4 monitor outputs + 1 display output |
| Power Supply | 18–36 Vdc (option 00); 110/220 Vac external supply available |
| Communication | Built-in Ethernet; optional Modbus gateway (Modbus/TCP); RS232/485 serial |
| Configuration | 1900 Configuration Software via PC/laptop over Ethernet |
| Mounting | DIN rail bracket or panel mounting plate |
| Certifications | CSA Class 1 Div 2, ATEX Zone 2, CE, GOST (IEC Ex) |
Product Introduction
The Bently Nevada 1900/65A-00-00-02-00-01 is a standalone, general-purpose equipment monitor from the 1900/65A product family. It provides continuous vibration and temperature monitoring with automatic shutdown protection for auxiliary and non-critical rotating machinery — pumps, fans, compressors, motors, centrifuges, and similar assets — where a full 3500-series system would be cost-prohibitive.What makes this monitor practical for field deployment is the combination of 4 vibration channels and 4 temperature channels in a single compact unit, backed by a 24-bit ADC running at 25 kHz bandwidth. Each vibration channel accepts software-configurable sensor types (accelerometer, velocity, or proximity), and the 6 relay outputs support programmable voting logic to reduce nuisance trips. Configuration is handled through the 1900 Configuration Software package, which downloads setup files to the monitor over the built-in Ethernet port. The unit stores configuration in non-volatile memory and supports Modbus/TCP communication with DCS, PLC, and SCADA systems.
Installation & Configuration Guide
Preparation — about 10 minutes
- De-energize the equipment and apply lockout/tagout procedures.
- Photograph the existing monitor nameplate, wiring connections, and sensor assignments before removal.
- Confirm the replacement unit matches the original part number — especially the suffix digits that encode power option, display option, and filter settings.
- Verify the power supply delivers 18–36 Vdc within ±10% tolerance.
- Prepare a laptop with the 1900 Configuration Software installed and an Ethernet cable.
Removal — about 5–10 minutes
- Disconnect all sensor cables, relay wiring, and 4–20 mA output connections. Label each wire.
- Remove DIN rail clips or panel mounting screws.
- Extract the monitor from its mounting position.
- Inspect terminal blocks for corrosion or damaged pins.
Installation — about 10 minutes
- Mount the new 1900/65A on the DIN rail or panel using the appropriate bracket.
- Reconnect vibration sensor cables to the correct input channels (CH1–CH4).
- Connect temperature sensor cables to the temperature input terminals.
- Wire relay outputs to the protection circuit per the system logic diagram.
- Connect 4–20 mA recorder outputs to the receiving instrumentation.
- Connect the Ethernet cable for configuration access.
- Apply 18–36 Vdc power and verify the power LED illuminates.
Power-On & Test — about 10 minutes
- Connect the laptop via Ethernet and launch the 1900 Configuration Software.
- Upload the saved configuration file (or create a new one matching the application requirements).
- Download the configuration to the monitor.
- Verify each channel reads valid sensor data — no open-circuit or short-circuit faults.
- Force Alert and Danger setpoints on one channel to confirm relay trip logic.
- Confirm Modbus communication with the host system (DCS/PLC/SCADA).
- Return the system to normal operating mode.
Troubleshooting Quick Reference
| Symptom | Most Likely Cause | First Check |
|---|---|---|
| No power LED | Power supply out of range or disconnected | Measure voltage at the power input terminals (must be 18–36 Vdc) |
| Channel shows open circuit | Sensor cable disconnected or broken | Check continuity from sensor to terminal block |
| Channel shows short circuit | Damaged sensor cable or sensor failure | Disconnect sensor and measure resistance at the terminal |
| Relay not tripping on Danger | Setpoint not configured or voting logic blocking | Open configuration software and verify relay assignment and voting logic |
| No Modbus communication | Ethernet cable fault or IP mismatch | Ping the monitor IP address; verify subnet settings |
| Erratic vibration readings | EMI from nearby power cables | Check cable routing — sensor cables should not run parallel to power conductors |
| Configuration will not download | Firmware mismatch or Ethernet link down | Verify link LED is lit; check firmware version matches software compatibility |
Dimensions, Mounting & Wiring Notes
- Monitor Dimensions: 7.75 × 5.88 × 2.93 inches (H × W × D)
- Display Dimensions (if attached): 7.75 × 5.03 × 1.29 inches
- Monitor with Display: 7.75 × 5.88 × 3.85 inches
- Mounting: DIN rail bracket or panel mounting plate
- Terminal Notes: Vibration inputs (CH1–CH4) accept Bently Nevada proximity probes, 2-wire or 3-wire accelerometers, and velocity sensors. Temperature inputs accept E, J, K, T thermocouples and 2-wire/3-wire RTDs. Relay outputs are dry-contact and must be wired to external protection circuits. 4–20 mA outputs are configurable per channel.
- Environmental: Optional IP54 weatherproof enclosure for outdoor mounting. Operating temperature range: -20°C to +70°C.
FAQ
What equipment is the 1900/65A designed to protect?
It targets general-purpose and auxiliary machinery — pumps, fans, motors, compressors, centrifuges, crushers, and small turbines. It is not intended as a replacement for the 3500 system on critical large-frame turbomachinery.Can I use this monitor in a hazardous area?
The monitor itself is certified for CSA Class 1 Div 2 and ATEX Zone 2. It cannot be installed in Div 1 / Zone 1 areas, but it can support sensors located in Div 1 / Zone 1 when used with appropriate isolation barriers and intrinsic safety interfaces.I lost my configuration file. Can I recover it from the monitor?
Yes. The 1900 Configuration Software can upload the current configuration from the monitor’s non-volatile memory back to the PC. Connect via Ethernet and use the upload function.What sensors are compatible with this monitor?
Bently Nevada proximity probes (eddy current type), 2-wire and 3-wire accelerometers, velocity sensors (velomitors), and standard E/J/K/T thermocouples plus 2-wire/3-wire RTDs for the temperature channels.How do I reduce nuisance trips?
The 1900/65A supports relay voting logic and configurable filter settings (up to 8-pole filtering on certain variables). You can also configure inhibit/multiplier trip inputs through the software to suppress trips during known transient conditions.Is this part interchangeable with other 1900/65A suffix codes?
Not automatically. The suffix digits encode power option, display option, bias filter, and other factory-set parameters. A unit with a different suffix may have different power requirements or filter characteristics. Always verify the full part number against your application requirements before substitution.What is the typical lead time for a replacement unit?
Availability varies by supplier and condition (new surplus, refurbished, or tested). Contact the supplier directly for current stock status and lead time. New units should be sourced through authorized Bently Nevada / Baker Hughes channels when possible.
