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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | A6120 |
| Function | Case seismic / absolute vibration monitoring |
| Channels | Two independent channels |
| Input Type | Electro-dynamic (electro-mechanical), differential |
| Compatible Sensors | Emerson 9266, 9267, 9268 |
| Input Voltage Range | –5 to +15 VDC |
| Frequency Range | Lower cutoff 1 or 5 Hz; upper 50–2000 Hz adjustable |
| Form Factor | 1-slot, 3U plug-in module |
| System Compatibility | AMS 6500 / CSI 6500 Machinery Health Monitor |
| Standards | Designed for API 670 machinery protection |
| Outputs | Buffered, 0/4–20 mA, 0–10 V (typical) |
4. Product Introduction
The Emerson A6120 is a dual-channel case seismic vibration monitor module for the AMS 6500 / CSI 6500 Machinery Health Monitor system. It measures case or structural vibration using electro-dynamic (velocity) sensors mounted on the machine casing. This measurement is commonly used on turbines, compressors, and other critical rotating equipment, especially in nuclear and heavy industrial applications.
The module occupies a single slot and works alongside other AMS 6500 monitors to form a complete API 670 protection system. It compares measured vibration against configurable alarm setpoints and can drive alarms or relays. Confirm sensor type, mounting, and system configuration before installation.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No vibration reading | Sensor, cable, or power issue | ✅ High | Verify sensor mounting, cable continuity, and power | Check sensor and module power |
| High or unstable reading | Loose mounting or external vibration | ✅ High | Inspect sensor mounting and surrounding structure | Secure mounting; isolate external vibration sources |
| Channel mismatch | Wiring or configuration error | ✅ High | Verify independent channel settings | Review AMS/CSI 6500 configuration software |
| Alarm trips unexpectedly | Setpoint too tight or noise | ✅ Medium | Review alarm setpoints and filter settings | Adjust setpoints and frequency filters |
| Module not recognized | Slot or backplane issue | ❌ Medium | Reseat module; check adjacent modules | Confirm proper seating and system power cycle |
| Drift or offset | Temperature or sensor aging | ✅ Medium | Compare with portable reference meter | Calibrate or replace sensor/module as needed |
If issues persist, record exact alarm codes, sensor part numbers, and mounting details, and photograph the module and wiring.
A6120
A6120
6. Frequently Asked Questions (FAQ)
Q: What does the A6120 measure?
A: It measures case seismic (absolute) vibration using electro-dynamic velocity sensors mounted on the machine casing. This is different from shaft relative vibration (measured by the A6110).
Q: How many channels does it have?
A: Two independent channels.
Q: Which sensors are compatible?
A: Emerson electro-dynamic sensors such as 9266, 9267, and 9268. Confirm exact sensor and cable compatibility for your installation.
Q: Is this module API 670 compliant?
A: It is designed for use in API 670 machinery protection systems when properly configured within the AMS 6500 / CSI 6500 rack.
Q: Can I hot-swap the A6120?
A: Follow Emerson AMS/CSI 6500 procedures. In most cases the rack should be powered down or the specific slot isolated according to the system manual.
Q: What should I check before ordering a replacement?
A: Note the exact module part number, rack slot location, sensor models, and current configuration settings. Photograph the front panel and any labels.
Q: Is the A6120 still in production?
A: Availability of new modules varies. Many units on the market are new surplus or carefully tested. Confirm current stock status and any revision differences when ordering.
