Description
Bently Nevada 1900/65 is a dual-channel vibration monitor primarily used for vibration measurement and protection of industrial rotating machinery such as steam turbines, compressors, and fans.
I. Model Breakdown and Parameter Explanation
The model uses a segmented coding system, with each part defined as follows:
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1900/65 - 00 - 01 - 03 - 01 - 01 | | | | | | | | | | | | | +--- Calibration/Options (default configuration) | | | | +------- Output configuration (current output type) | | | +----------- Input type (sensor type) | | +--------------- Number of channels/function (dual-channel vibration monitoring) | +------------------- Series model (1900/65 series) +--------------------------- Brand series
Detailed parameter analysis:
- Series model: 1900/65
Dual-channel vibration monitor supporting measurement of vibration displacement, velocity, or acceleration (requires corresponding sensors). Provides alarm and shutdown protection functions, suitable for machinery condition monitoring systems. - Number of channels/function: 00
Fixed as "00", representing dual-channel vibration monitoring (standard configuration). - Input type: 01
"01" indicates input from a proximity probe (eddy current sensor) for measuring shaft vibration or shaft displacement.
Other possible input types: e.g., "02" for velocity sensors, "03" for accelerometers, etc. - Output configuration: 03
"03" denotes 4-20mA current output (independent for dual channels), used to connect to PLC, DCS, or other control systems.
Other possible outputs: e.g., "01" for voltage output, "02" for frequency output, etc. - Calibration/Options: 01-01
First "01": Calibration type is factory default (user-customizable calibration parameters).
Second "01": No additional options (standard configuration, no redundancy or special functions).
II. Technical Parameters
- Input Characteristics
- Displacement mode: Typically -20 VDC to -4 VDC (corresponding to probe linear range, e.g., 0-2500μm displacement).
- Vibration velocity/acceleration: Converted via internal software settings (sensor-type dependent).
- Number of channels: 2 independent measurement channels
- Sensor types:
Supports eddy current displacement probes (e.g., 3300 series) for shaft vibration or displacement measurement.
Optional velocity sensors or accelerometers (subject to model configuration). - Input range:
- Output Characteristics
- Analog output:
2 isolated 4-20mA current outputs (corresponding to vibration amplitude, e.g., peak-to-peak or RMS value).
Accuracy: ±0.5% FS (full scale). - Alarm output:
2 relay outputs (independent per channel), supporting high alarm (HI) and high-high alarm (HH).
Contact rating: Typically 250V AC/5A or 30V DC/5A. - Communication interface:
Optional RS-485 (Modbus RTU protocol) or Ethernet (requires upgraded model). - Measurement Functions
- Displacement mode: 0.1 Hz – 10 kHz.
- Vibration velocity/acceleration: 10 Hz – 10 kHz (sensor and filter settings dependent).
- Vibration parameters:
Measures peak-to-peak (P-P), root mean square (RMS), or peak vibration amplitude.
Supports total value or narrowband filtering (e.g., tracking rotor speed frequency). - Frequency range:
- Power Supply
- Voltage: 100-240V AC (50/60Hz) or 24V DC (depending on model suffix).
- Power consumption: Typically 10W (without communication module).
- Mechanical Specifications
- Mounting method: DIN rail or panel mounting.
- Dimensions: Approx. 140mm (H) × 85mm (W) × 150mm (D).
- Operating temperature: -20°C to +70°C (non-condensing).
- Protection rating: IP20 (indoor use).
III. Functional Features
- Core Functions
Dual-channel independent monitoring for simultaneous measurement of shaft vibration (X/Y directions) or shaft displacement.
Measures vibration parameters including peak, RMS, and peak-to-peak values.
Supports alarm and danger setpoints, triggering protection actions via relay outputs. - Signal Processing
Built-in signal conditioning circuits adapt to high-frequency signals from eddy current sensors (response frequency typically 0-10kHz).
Output signals configurable as vibration displacement (μm), velocity (mm/s), or acceleration (g). - Industrial Suitability
Wide temperature range (-40°C to 85°C), adapting to harsh industrial environments.
EMI-resistant design compliant with industrial standards (e.g., IEEE, ISO).
IV. Application Scenarios
- Rotating Machinery Monitoring: Online shaft vibration monitoring for steam turbines, compressors, motors, fans, etc.
- Protection System Integration: As a front-end sensor module for machinery protection systems (MPS), compatible with Bently 3500 series or third-party control systems.
- Condition-Based Maintenance (CBM): Connects to data acquisition systems via 4-20mA outputs for vibration trend analysis and fault early warning.
V. Installation and Wiring
- Hardware Installation
Standard 19-inch rack mounting (requires compatible brackets) or rail mounting (model-dependent).
Ensure good ventilation and keep away from strong electromagnetic sources (e.g., variable frequency drives, motors). - Wiring Instructions
- Sensor input:
Eddy current sensors require a complete measurement chain: probe, extender cable, and preamp.
Input interfaces are typically terminal blocks or aviation plugs; connect with correct polarity (+/- signal and common). - Output connections:
4-20mA outputs directly connect to analog input modules of DCS/PLC (load resistance ≤500Ω recommended).
Relay outputs (alarm/shutdown) connect to external control circuits, noting contact ratings (e.g., 24V DC/1A). - Power input: Typically 24V DC or 115/230V AC (confirm model-specific power specifications).
VI. Configuration and Debugging
- Parameter Setup
Configure via front-panel keys or configuration software (e.g., Bently Insight or third-party tools): - Measurement units (displacement/velocity/acceleration), filter frequencies (high-pass/low-pass).
- Alarm/danger thresholds, delay times (to avoid false triggers).
- Output signal scaling (e.g., 4mA=0μm, 20mA=100μm).
- Calibration Methods
- Static calibration: Adjust probe clearance using a standard displacement source (e.g., micrometer) to verify output linearity.
- Dynamic calibration: Input known frequency and amplitude signals via a vibration table to validate measurement accuracy.
- Calibration interval: Recommended annually or during equipment overhauls.
VII. Troubleshooting and Maintenance
- Common Faults and Solutions
Fault Symptom Possible Cause Solution No output signal Power failure, sensor disconnection Check power voltage, replace sensor cable Unstable output Electromagnetic interference, loose probe mounting Add shielding, tighten probe bracket False alarm triggers Improper threshold settings, unreasonable filter parameters Recalibrate thresholds, adjust filter frequencies Relays not operating Contact damage, control circuit open Replace relays, check wiring connections - Maintenance Tips
Regularly clean the device casing and ventilation holes to prevent dust accumulation affecting heat dissipation.
Inspect terminal connections for tightness, especially for sensor inputs and relay outputs.
Backup configuration parameters for quick recovery after faults (e.g., export configuration files via software).
