Description
1. At-A-Glance Executive Brief
- Model: A6120 (Epro / CSI 6500)
- Brand: Emerson
- Part Type: Case Seismic Vibration Monitoring Module
- Lifecycle Status: Legacy / Active Support Tier
- Weight: 0.32 kg (Net)
- System Compatibility: CSI 6500 Machinery Health Platform / Epro Rack Systems
2. Technical Introduction
Unmonitored casing vibration can lead to catastrophic structural bearing fatigue before internal shaft sensors register a change.
The Emerson A6120 module provides dual-channel continuous monitoring of absolute casing vibration for gearboxes, pumps, and large balance-of-plant machinery. It processes signals from velocity sensors, accelerometers, or electro-dynamic transducers, evaluating overall vibration velocity or displacement against user-configured alarm thresholds. By feeding raw buffered signals directly to diagnostic collection ports while routing safety interlocks to the rack relay card, the module protects industrial equipment from unaligned loads and structural resonance issues.
- Best Suited For:
- Heavy-duty centrifugal compressor casing protection
- Large industrial motor and boiler feed pump monitoring
- Legacy Epro rack retrofits requiring API-compliant vibration inputs
3. Core Technical Specifications
| Parameter | Value |
| Input Channels | 2 independent channels |
| Input Impedance | >100 k\Omega |
| Input Voltage Range | -5 to +15 VDC |
| Frequency Response Range | 0.1 Hz to 15 kHz (Buffered outputs) |
| Selectable Filter Ranges | 5-50 Hz, 10-50 Hz, 50-1000 Hz, 50-1600 Hz |
| Power Consumption | Max 6 W (250 mA at 24 VDC) |
| Operating Temperature | 0°C to 65°C (32°F to 149°F) |
| Form Factor | 3U Eurocard, single slot (6 TE width) |
| Weight | 320 g (Net) / 450 g (Gross) |
4. Field Engineer’s Tech Notes
- Filter Switch Configuration: Verify internal hardware jumpers or software filter configurations match the machine running speed before initial startup, as improper high-pass or low-pass cutoff settings will mask structural harmonics or trigger nuisance trips.
- Buffered Output Isolation: When tapping raw dynamic signals from the front-panel BNC or rear buffered pins for portable data collectors, ensure testing equipment does not introduce ground loops that corrupt the primary protection loop voltage.
5. Adaptive QA & Testing Protocol
Bench verification involves injecting synthesized AC vibration waveforms through a function generator to test channel frequency response across selectable filter bands (10 Hz to 1000 Hz). Alarm and trip relay activation times are timed using simulated high-amplitude acceleration peaks. Raw buffered outputs are checked on an oscilloscope for phase linearity and signal attenuation. Full functional test logs and calibration records are available upon request prior to dispatch.
6. Buyer’s FAQ
- What warranty coverage comes with this module?All units include a standard 12-month operational warranty covering all hardware and functional components.
- Are these units supplied as New Surplus or refurbished?We offer both factory-sealed New Surplus (NSFP) and fully bench-tested refurbished versions depending on stock availability and project requirements.
- How fast can this part ship for an emergency plant outage?Expedited same-day air shipping is available for all in-stock inventory to minimize downtime during unplanned outages.
