Description
Emerson A3120-022-000
Technical Specifications:
- Brand: Emerson
- Product Type: Dual-Channel Bearing Vibration Monitor
- Model Designation: A3120-022-000 / CSI 3120
- Sensor Input Type: PR9268 seismic sensor
- Frequency Range: High-pass filter at 5 / 10 / 15 Hz; low-pass filter from 50 to 1500 Hz
- Measurement Range: Freely selectable via configuration software based on the application sensor
- Connection Type: Harting socket
- Current Output: 0/4 to 20 mA (20 to 4/0 mA configurable)
- Maximum Load: 500 ohms
- Maximum Voltage: 48 VDC
- Maximum Current: 1 A
- Maximum Contact Power: 50 W
- Power Consumption: Maximum 6 W
- Operating Temperature: -20°C to +65°C (-4°F to +149°F)
- Ingress Protection: IP65
- Shock Limit: 20 g peak
Functional Features:
- Dual-Channel Monitoring: Simultaneously monitors vibration on two independent bearing positions, doubling surveillance coverage from a single compact unit
- High-Precision Sensing: Employs advanced PR9268 seismic sensor technology to capture minute vibration signatures for early fault detection
- Software-Configurable Parameters: Measurement settings, alarm thresholds, and output scaling are all programmable in the field via dedicated configuration software
- Real-Time Data Output: Delivers continuous 4–20 mA analog output proportional to vibration amplitude for integration with DCS, SCADA, or PLC systems
- Robust Environmental Protection: IP65-rated enclosure provides protection against dust ingress and water jets in harsh industrial environments
Application Scenarios:
- Small steam turbines, gas turbines, and water turbines
- Industrial compressors and pumps
- Cooling fans and blowers
- Gearboxes and motor bearing monitoring
- Petrochemical rotating equipment
- Power generation balance-of-plant machinery
Performance Parameters:
- Channels: 2 independent measurement channels
- Frequency Response: 5–1500 Hz (configurable high-pass and low-pass filters)
- Output Signal: 4–20 mA proportional to vibration level
- Output Load Capacity: Up to 500 ohms
- Power Supply: Up to 48 VDC, 1 A maximum
Material Composition:
- Aluminum and stainless steel enclosure
- Industrial-grade printed circuit board assembly
- Precision seismic sensor interface components
- Harting-type industrial connector
Structural Features:
- Compact dual-channel form factor
- Front-panel Harting socket for sensor connection
- IP65-rated sealed housing for dust and moisture protection
- Lightweight construction at approximately 1300 g (45.8 oz)
- Status indicator LEDs for operational diagnostics
Working Principle:
The monitor receives vibration signals from PR9268 seismic sensors mounted on bearing housings. The analog sensor signals are conditioned and filtered through selectable high-pass and low-pass filter stages to isolate the frequency band of interest. The processed signals are then converted to proportional 4–20 mA current loop outputs for transmission to the host control system. When vibration levels exceed user-defined alarm thresholds, the unit generates alert signals for operator notification and protective action.
Installation Requirements:
- Mount the unit in a location with ambient temperature between -20°C and +65°C
- Connect PR9268 seismic sensors to the Harting socket using appropriate shielded cables
- Configure measurement parameters, alarm setpoints, and output ranges via the configuration software before commissioning
- Ensure the 4–20 mA output loop load does not exceed 500 ohms
- Verify IP65 sealing integrity when installed in outdoor or washdown environments
Usage Precautions:
- Verify sensor compatibility with the PR9268 specification before connecting
- Perform baseline vibration readings during normal operation to establish accurate alarm thresholds
- Do not exceed the 48 VDC power supply limit
- Ensure proper cable shielding and grounding to maintain signal integrity in electrically noisy environments
- Periodically inspect the Harting connector for corrosion or mechanical damage
